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Merge pull request #41042 from kssenii/refactor-cache-for-async-download

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Cache refactoring for async download
This commit is contained in:
Kseniia Sumarokova 2022-09-13 12:26:35 +02:00 committed by GitHub
commit 3dd28bb79a
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GPG Key ID: 4AEE18F83AFDEB23
8 changed files with 681 additions and 537 deletions
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207
src/Disks/IO/CachedOnDiskReadBufferFromFile.cpp
View File

@ -118,7 +118,11 @@ void CachedOnDiskReadBufferFromFile::initialize(size_t offset, size_t size)
}
else
{
file_segments_holder.emplace(cache->getOrSet(cache_key, offset, size, is_persistent));
CreateFileSegmentSettings create_settings{
.is_persistent = is_persistent
};
file_segments_holder.emplace(cache->getOrSet(cache_key, offset, size, create_settings));
}
/**
@ -156,7 +160,7 @@ CachedOnDiskReadBufferFromFile::getCacheReadBuffer(size_t offset) const
}
CachedOnDiskReadBufferFromFile::ImplementationBufferPtr
CachedOnDiskReadBufferFromFile::getRemoteFSReadBuffer(FileSegmentPtr & file_segment, ReadType read_type_)
CachedOnDiskReadBufferFromFile::getRemoteFSReadBuffer(FileSegment & file_segment, ReadType read_type_)
{
switch (read_type_)
{
@ -178,7 +182,7 @@ CachedOnDiskReadBufferFromFile::getRemoteFSReadBuffer(FileSegmentPtr & file_segm
* Implementation buffer from segment1 is passed to segment2 once segment1 is loaded.
*/
auto remote_fs_segment_reader = file_segment->getRemoteFileReader();
auto remote_fs_segment_reader = file_segment.getRemoteFileReader();
if (!remote_fs_segment_reader)
{
@ -189,7 +193,7 @@ CachedOnDiskReadBufferFromFile::getRemoteFSReadBuffer(FileSegmentPtr & file_segm
ErrorCodes::CANNOT_USE_CACHE,
"Cache cannot be used with a ReadBuffer which does not support right bounded reads");
file_segment->setRemoteFileReader(remote_fs_segment_reader);
file_segment.setRemoteFileReader(remote_fs_segment_reader);
}
return remote_fs_segment_reader;
@ -201,8 +205,8 @@ CachedOnDiskReadBufferFromFile::getRemoteFSReadBuffer(FileSegmentPtr & file_segm
if (remote_file_reader && remote_file_reader->getFileOffsetOfBufferEnd() == file_offset_of_buffer_end)
return remote_file_reader;
auto remote_fs_segment_reader = file_segment->extractRemoteFileReader();
if (remote_fs_segment_reader)
auto remote_fs_segment_reader = file_segment.extractRemoteFileReader();
if (remote_fs_segment_reader && file_offset_of_buffer_end == remote_file_reader->getFileOffsetOfBufferEnd())
remote_file_reader = remote_fs_segment_reader;
else
remote_file_reader = implementation_buffer_creator();
@ -217,6 +221,19 @@ CachedOnDiskReadBufferFromFile::getRemoteFSReadBuffer(FileSegmentPtr & file_segm
}
}
bool CachedOnDiskReadBufferFromFile::canStartFromCache(size_t current_offset, const FileSegment & file_segment)
{
/// segment{k} state: DOWNLOADING
/// cache: [______|___________
/// ^
/// first_non_downloaded_offset (in progress)
/// requested_range: [__________]
/// ^
/// current_offset
size_t first_non_downloaded_offset = file_segment.getFirstNonDownloadedOffset();
return first_non_downloaded_offset > current_offset;
}
CachedOnDiskReadBufferFromFile::ImplementationBufferPtr
CachedOnDiskReadBufferFromFile::getReadBufferForFileSegment(FileSegmentPtr & file_segment)
{
@ -236,7 +253,7 @@ CachedOnDiskReadBufferFromFile::getReadBufferForFileSegment(FileSegmentPtr & fil
{
LOG_DEBUG(log, "Bypassing cache because `read_from_filesystem_cache_if_exists_otherwise_bypass_cache` option is used");
read_type = ReadType::REMOTE_FS_READ_BYPASS_CACHE;
return getRemoteFSReadBuffer(file_segment, read_type);
return getRemoteFSReadBuffer(*file_segment, read_type);
}
}
@ -248,21 +265,16 @@ CachedOnDiskReadBufferFromFile::getReadBufferForFileSegment(FileSegmentPtr & fil
{
LOG_DEBUG(log, "Bypassing cache because file segment state is `SKIP_CACHE`");
read_type = ReadType::REMOTE_FS_READ_BYPASS_CACHE;
return getRemoteFSReadBuffer(file_segment, read_type);
return getRemoteFSReadBuffer(*file_segment, read_type);
}
case FileSegment::State::DOWNLOADING:
{
size_t download_offset = file_segment->getDownloadOffset();
bool can_start_from_cache = download_offset > file_offset_of_buffer_end;
/// If file segment is being downloaded but we can already read
/// from already downloaded part, do that.
if (can_start_from_cache)
if (canStartFromCache(file_offset_of_buffer_end, *file_segment))
{
/// segment{k} state: DOWNLOADING
/// cache: [______|___________
/// ^
/// download_offset (in progress)
/// first_non_downloaded_offset (in progress)
/// requested_range: [__________]
/// ^
/// file_offset_of_buffer_end
@ -282,12 +294,12 @@ CachedOnDiskReadBufferFromFile::getReadBufferForFileSegment(FileSegmentPtr & fil
case FileSegment::State::EMPTY:
case FileSegment::State::PARTIALLY_DOWNLOADED:
{
if (file_segment->getDownloadOffset() > file_offset_of_buffer_end)
if (canStartFromCache(file_offset_of_buffer_end, *file_segment))
{
/// segment{k} state: PARTIALLY_DOWNLOADED
/// cache: [______|___________
/// ^
/// download_offset (in progress)
/// first_non_downloaded_offset (in progress)
/// requested_range: [__________]
/// ^
/// file_offset_of_buffer_end
@ -299,20 +311,12 @@ CachedOnDiskReadBufferFromFile::getReadBufferForFileSegment(FileSegmentPtr & fil
auto downloader_id = file_segment->getOrSetDownloader();
if (downloader_id == file_segment->getCallerId())
{
size_t download_offset = file_segment->getDownloadOffset();
bool can_start_from_cache = download_offset > file_offset_of_buffer_end;
LOG_TEST(
log,
"Current download offset: {}, file offset of buffer end: {}",
download_offset, file_offset_of_buffer_end);
if (can_start_from_cache)
if (canStartFromCache(file_offset_of_buffer_end, *file_segment))
{
/// segment{k}
/// cache: [______|___________
/// ^
/// download_offset
/// first_non_downloaded_offset
/// requested_range: [__________]
/// ^
/// file_offset_of_buffer_end
@ -322,27 +326,24 @@ CachedOnDiskReadBufferFromFile::getReadBufferForFileSegment(FileSegmentPtr & fil
return getCacheReadBuffer(range.left);
}
if (download_offset < file_offset_of_buffer_end)
if (file_segment->getCurrentWriteOffset() < file_offset_of_buffer_end)
{
/// segment{1}
/// cache: [_____|___________
/// ^
/// download_offset
/// current_write_offset
/// requested_range: [__________]
/// ^
/// file_offset_of_buffer_end
assert(file_offset_of_buffer_end > file_segment->getDownloadOffset());
bytes_to_predownload = file_offset_of_buffer_end - file_segment->getDownloadOffset();
assert(bytes_to_predownload < range.size());
LOG_TEST(log, "Predownload. File segment info: {}", file_segment->getInfoForLog());
chassert(file_offset_of_buffer_end > file_segment->getCurrentWriteOffset());
bytes_to_predownload = file_offset_of_buffer_end - file_segment->getCurrentWriteOffset();
chassert(bytes_to_predownload < range.size());
}
download_offset = file_segment->getDownloadOffset();
can_start_from_cache = download_offset > file_offset_of_buffer_end;
assert(!can_start_from_cache);
read_type = ReadType::REMOTE_FS_READ_AND_PUT_IN_CACHE;
return getRemoteFSReadBuffer(file_segment, read_type);
return getRemoteFSReadBuffer(*file_segment, read_type);
}
download_state = file_segment->state();
@ -350,10 +351,7 @@ CachedOnDiskReadBufferFromFile::getReadBufferForFileSegment(FileSegmentPtr & fil
}
case FileSegment::State::PARTIALLY_DOWNLOADED_NO_CONTINUATION:
{
size_t download_offset = file_segment->getDownloadOffset();
bool can_start_from_cache = download_offset > file_offset_of_buffer_end;
if (can_start_from_cache)
if (canStartFromCache(file_offset_of_buffer_end, *file_segment))
{
read_type = ReadType::CACHED;
return getCacheReadBuffer(range.left);
@ -364,7 +362,7 @@ CachedOnDiskReadBufferFromFile::getReadBufferForFileSegment(FileSegmentPtr & fil
log,
"Bypassing cache because file segment state is `PARTIALLY_DOWNLOADED_NO_CONTINUATION` and downloaded part already used");
read_type = ReadType::REMOTE_FS_READ_BYPASS_CACHE;
return getRemoteFSReadBuffer(file_segment, read_type);
return getRemoteFSReadBuffer(*file_segment, read_type);
}
}
}
@ -374,8 +372,8 @@ CachedOnDiskReadBufferFromFile::getReadBufferForFileSegment(FileSegmentPtr & fil
CachedOnDiskReadBufferFromFile::ImplementationBufferPtr
CachedOnDiskReadBufferFromFile::getImplementationBuffer(FileSegmentPtr & file_segment)
{
assert(!file_segment->isDownloader());
assert(file_offset_of_buffer_end >= file_segment->range().left);
chassert(!file_segment->isDownloader());
chassert(file_offset_of_buffer_end >= file_segment->range().left);
auto range = file_segment->range();
bytes_to_predownload = 0;
@ -389,10 +387,10 @@ CachedOnDiskReadBufferFromFile::getImplementationBuffer(FileSegmentPtr & file_se
ProfileEvents::FileSegmentWaitReadBufferMicroseconds, watch.elapsedMicroseconds());
[[maybe_unused]] auto download_current_segment = read_type == ReadType::REMOTE_FS_READ_AND_PUT_IN_CACHE;
assert(download_current_segment == file_segment->isDownloader());
chassert(download_current_segment == file_segment->isDownloader());
assert(file_segment->range() == range);
assert(file_offset_of_buffer_end >= range.left && file_offset_of_buffer_end <= range.right);
chassert(file_segment->range() == range);
chassert(file_offset_of_buffer_end >= range.left && file_offset_of_buffer_end <= range.right);
LOG_TEST(
log,
@ -441,12 +439,12 @@ CachedOnDiskReadBufferFromFile::getImplementationBuffer(FileSegmentPtr & file_se
}
case ReadType::REMOTE_FS_READ_AND_PUT_IN_CACHE:
{
assert(file_segment->isDownloader());
chassert(file_segment->isDownloader());
if (bytes_to_predownload)
{
size_t download_offset = file_segment->getDownloadOffset();
read_buffer_for_file_segment->seek(download_offset, SEEK_SET);
size_t current_write_offset = file_segment->getCurrentWriteOffset();
read_buffer_for_file_segment->seek(current_write_offset, SEEK_SET);
}
else
{
@ -456,18 +454,15 @@ CachedOnDiskReadBufferFromFile::getImplementationBuffer(FileSegmentPtr & file_se
assert(static_cast<size_t>(read_buffer_for_file_segment->getFileOffsetOfBufferEnd()) == file_offset_of_buffer_end);
}
auto download_offset = file_segment->getDownloadOffset();
if (download_offset != static_cast<size_t>(read_buffer_for_file_segment->getPosition()))
auto current_write_offset = file_segment->getCurrentWriteOffset();
if (current_write_offset != static_cast<size_t>(read_buffer_for_file_segment->getPosition()))
{
throw Exception(
ErrorCodes::LOGICAL_ERROR,
"Buffer's offsets mismatch; cached buffer offset: {}, download_offset: {}, "
"position: {}, implementation buffer remaining read range: {}, file segment info: {}",
file_offset_of_buffer_end,
download_offset,
read_buffer_for_file_segment->getPosition(),
read_buffer_for_file_segment->getRemainingReadRange().toString(),
file_segment->getInfoForLog());
"Buffer's offsets mismatch. Cached buffer offset: {}, current_write_offset: {} implementation buffer offset: {}, "
"implementation buffer remaining range: {}, file segment info: {}",
file_offset_of_buffer_end, current_write_offset, read_buffer_for_file_segment->getPosition(),
read_buffer_for_file_segment->getRemainingReadRange().toString(), file_segment->getInfoForLog());
}
break;
@ -488,7 +483,7 @@ bool CachedOnDiskReadBufferFromFile::completeFileSegmentAndGetNext()
auto & file_segment = *file_segment_it;
[[maybe_unused]] const auto & range = file_segment->range();
assert(file_offset_of_buffer_end > range.right);
chassert(file_offset_of_buffer_end > range.right);
LOG_TEST(
log,
@ -499,10 +494,8 @@ bool CachedOnDiskReadBufferFromFile::completeFileSegmentAndGetNext()
/// Do not hold pointer to file segment if it is not needed anymore
/// so can become releasable and can be evicted from cache.
/// If the status of filesegment state is SKIP_CACHE, it will not be deleted.
/// It will be deleted from the cache when the holder is destructed.
if ((*file_segment_it)->state() != FileSegment::State::SKIP_CACHE)
file_segments_holder->file_segments.erase(file_segment_it);
file_segment->completeWithoutState();
file_segments_holder->file_segments.erase(file_segment_it);
if (current_file_segment_it == file_segments_holder->file_segments.end())
return false;
@ -545,8 +538,8 @@ void CachedOnDiskReadBufferFromFile::predownload(FileSegmentPtr & file_segment)
/// download from offset a'' < a', but return buffer from offset a'.
LOG_TEST(log, "Bytes to predownload: {}, caller_id: {}", bytes_to_predownload, FileSegment::getCallerId());
assert(implementation_buffer->getFileOffsetOfBufferEnd() == file_segment->getDownloadOffset());
size_t current_offset = file_segment->getDownloadOffset();
chassert(implementation_buffer->getFileOffsetOfBufferEnd() == file_segment->getCurrentWriteOffset());
size_t current_offset = file_segment->getCurrentWriteOffset();
const auto & current_range = file_segment->range();
while (true)
@ -572,7 +565,7 @@ void CachedOnDiskReadBufferFromFile::predownload(FileSegmentPtr & file_segment)
"current download offset: {}, expected: {}, eof: {}",
bytes_to_predownload,
current_range.toString(),
file_segment->getDownloadOffset(),
file_segment->getCurrentWriteOffset(),
file_offset_of_buffer_end,
implementation_buffer->eof());
@ -582,18 +575,20 @@ void CachedOnDiskReadBufferFromFile::predownload(FileSegmentPtr & file_segment)
{
nextimpl_working_buffer_offset = implementation_buffer->offset();
auto download_offset = file_segment->getDownloadOffset();
if (download_offset != static_cast<size_t>(implementation_buffer->getPosition())
|| download_offset != file_offset_of_buffer_end)
auto current_write_offset = file_segment->getCurrentWriteOffset();
if (current_write_offset != static_cast<size_t>(implementation_buffer->getPosition())
|| current_write_offset != file_offset_of_buffer_end)
{
throw Exception(
ErrorCodes::LOGICAL_ERROR,
"Buffer's offsets mismatch after predownloading; download offset: {}, "
"cached buffer offset: {}, implementation buffer offset: {}, "
"file segment info: {}",
download_offset,
current_write_offset,
file_offset_of_buffer_end,
implementation_buffer->getPosition(),
file_segment->getInfoForLog());
}
}
break;
@ -609,7 +604,7 @@ void CachedOnDiskReadBufferFromFile::predownload(FileSegmentPtr & file_segment)
{
LOG_TEST(log, "Left to predownload: {}, buffer size: {}", bytes_to_predownload, current_impl_buffer_size);
assert(file_segment->getDownloadOffset() == static_cast<size_t>(implementation_buffer->getPosition()));
chassert(file_segment->getCurrentWriteOffset() == static_cast<size_t>(implementation_buffer->getPosition()));
bool success = writeCache(implementation_buffer->buffer().begin(), current_predownload_size, current_offset, *file_segment);
if (success)
@ -635,7 +630,7 @@ void CachedOnDiskReadBufferFromFile::predownload(FileSegmentPtr & file_segment)
/// segment{1}
/// cache: [_____|___________
/// ^
/// download_offset
/// current_write_offset
/// requested_range: [__________]
/// ^
/// file_offset_of_buffer_end
@ -649,17 +644,18 @@ void CachedOnDiskReadBufferFromFile::predownload(FileSegmentPtr & file_segment)
bytes_to_predownload = 0;
file_segment->completeWithState(FileSegment::State::PARTIALLY_DOWNLOADED_NO_CONTINUATION);
LOG_TEST(log, "Bypassing cache because space reservation failed");
LOG_TEST(log, "Bypassing cache because for {}", file_segment->getInfoForLog());
read_type = ReadType::REMOTE_FS_READ_BYPASS_CACHE;
swap(*implementation_buffer);
resetWorkingBuffer();
implementation_buffer = getRemoteFSReadBuffer(file_segment, read_type);
implementation_buffer = getRemoteFSReadBuffer(*file_segment, read_type);
swap(*implementation_buffer);
implementation_buffer->setReadUntilPosition(current_range.right + 1); /// [..., range.right]
implementation_buffer->setReadUntilPosition(file_segment->range().right + 1); /// [..., range.right]
implementation_buffer->seek(file_offset_of_buffer_end, SEEK_SET);
LOG_TEST(
@ -680,8 +676,8 @@ bool CachedOnDiskReadBufferFromFile::updateImplementationBufferIfNeeded()
auto current_read_range = file_segment->range();
auto current_state = file_segment->state();
assert(current_read_range.left <= file_offset_of_buffer_end);
assert(!file_segment->isDownloader());
chassert(current_read_range.left <= file_offset_of_buffer_end);
chassert(!file_segment->isDownloader());
if (file_offset_of_buffer_end > current_read_range.right)
{
@ -695,13 +691,15 @@ bool CachedOnDiskReadBufferFromFile::updateImplementationBufferIfNeeded()
/// segment{k}
/// cache: [______|___________
/// ^
/// download_offset
/// current_write_offset
/// requested_range: [__________]
/// ^
/// file_offset_of_buffer_end
size_t download_offset = file_segment->getDownloadOffset();
bool cached_part_is_finished = download_offset == file_offset_of_buffer_end;
auto current_write_offset = file_segment->getCurrentWriteOffset();
bool cached_part_is_finished = current_write_offset == file_offset_of_buffer_end;
LOG_TEST(log, "Current write offset: {}, file offset of buffer end: {}", current_write_offset, file_offset_of_buffer_end);
if (cached_part_is_finished)
{
@ -710,12 +708,12 @@ bool CachedOnDiskReadBufferFromFile::updateImplementationBufferIfNeeded()
return true;
}
else if (download_offset < file_offset_of_buffer_end)
else if (current_write_offset < file_offset_of_buffer_end)
{
throw Exception(
ErrorCodes::LOGICAL_ERROR,
"Expected {} >= {} ({})",
download_offset, file_offset_of_buffer_end, getInfoForLog());
current_write_offset, file_offset_of_buffer_end, getInfoForLog());
}
}
@ -725,7 +723,7 @@ bool CachedOnDiskReadBufferFromFile::updateImplementationBufferIfNeeded()
* ReadType::REMOTE_FS_READ_AND_PUT_IN_CACHE means that on previous getImplementationBuffer() call
* current buffer successfully called file_segment->getOrSetDownloader() and became a downloader
* for this file segment. However, the downloader's term has a lifespan of 1 nextImpl() call,
* e.g. downloader reads buffer_size byte and calls completeBatchAndResetDownloader() and some other
* e.g. downloader reads buffer_size byte and calls completePartAndResetDownloader() and some other
* thread can become a downloader if it calls getOrSetDownloader() faster.
*
* So downloader is committed to download only buffer_size bytes and then is not a downloader anymore,
@ -817,11 +815,11 @@ bool CachedOnDiskReadBufferFromFile::nextImplStep()
if (need_complete_file_segment)
{
LOG_TEST(log, "Resetting downloader {} from scope exit", file_segment->getDownloader());
file_segment->completeBatchAndResetDownloader();
file_segment->completePartAndResetDownloader();
}
}
assert(!file_segment->isDownloader());
chassert(!file_segment->isDownloader());
}
catch (...)
{
@ -845,7 +843,7 @@ bool CachedOnDiskReadBufferFromFile::nextImplStep()
(*current_file_segment_it)->incrementHitsCount();
}
assert(!internal_buffer.empty());
chassert(!internal_buffer.empty());
swap(*implementation_buffer);
@ -854,15 +852,14 @@ bool CachedOnDiskReadBufferFromFile::nextImplStep()
LOG_TEST(
log,
"Current segment: {}, downloader: {}, current count: {}, position: {}, read range: {}",
current_read_range.toString(),
file_segment->getDownloader(),
"Current count: {}, position: {}, read range: {}, file segment: {}",
implementation_buffer->count(),
implementation_buffer->getPosition(),
implementation_buffer->getRemainingReadRange().toString());
implementation_buffer->getRemainingReadRange().toString(),
file_segment->getInfoForLog());
assert(current_read_range.left <= file_offset_of_buffer_end);
assert(current_read_range.right >= file_offset_of_buffer_end);
chassert(current_read_range.left <= file_offset_of_buffer_end);
chassert(current_read_range.right >= file_offset_of_buffer_end);
bool result = false;
size_t size = 0;
@ -939,24 +936,26 @@ bool CachedOnDiskReadBufferFromFile::nextImplStep()
{
if (download_current_segment)
{
assert(file_offset_of_buffer_end + size - 1 <= file_segment->range().right);
chassert(file_offset_of_buffer_end + size - 1 <= file_segment->range().right);
bool success = file_segment->reserve(size);
if (success)
{
assert(file_segment->getDownloadOffset() == static_cast<size_t>(implementation_buffer->getPosition()));
chassert(file_segment->getCurrentWriteOffset() == static_cast<size_t>(implementation_buffer->getPosition()));
success = writeCache(implementation_buffer->position(), size, file_offset_of_buffer_end, *file_segment);
if (success)
{
assert(file_segment->getDownloadOffset() <= file_segment->range().right + 1);
assert(
chassert(file_segment->getCurrentWriteOffset() <= file_segment->range().right + 1);
chassert(
std::next(current_file_segment_it) == file_segments_holder->file_segments.end()
|| file_segment->getDownloadOffset() == implementation_buffer->getFileOffsetOfBufferEnd());
|| file_segment->getCurrentWriteOffset() == implementation_buffer->getFileOffsetOfBufferEnd());
LOG_TEST(log, "Successfully written {} bytes", size);
}
else
{
assert(file_segment->state() == FileSegment::State::PARTIALLY_DOWNLOADED_NO_CONTINUATION);
chassert(file_segment->state() == FileSegment::State::PARTIALLY_DOWNLOADED_NO_CONTINUATION);
LOG_TEST(log, "Bypassing cache because writeCache method failed");
}
}
@ -984,7 +983,7 @@ bool CachedOnDiskReadBufferFromFile::nextImplStep()
size_t remaining_size_to_read
= std::min(current_read_range.right, read_until_position - 1) - file_offset_of_buffer_end + 1;
size = std::min(size, remaining_size_to_read);
assert(implementation_buffer->buffer().size() >= nextimpl_working_buffer_offset + size);
chassert(implementation_buffer->buffer().size() >= nextimpl_working_buffer_offset + size);
implementation_buffer->buffer().resize(nextimpl_working_buffer_offset + size);
}
@ -996,15 +995,15 @@ bool CachedOnDiskReadBufferFromFile::nextImplStep()
current_file_segment_counters.increment(ProfileEvents::FileSegmentUsedBytes, available());
if (download_current_segment)
file_segment->completeBatchAndResetDownloader();
file_segment->completePartAndResetDownloader();
assert(!file_segment->isDownloader());
chassert(!file_segment->isDownloader());
LOG_TEST(
log,
"Key: {}. Returning with {} bytes, buffer position: {} (offset: {}, predownloaded: {}), "
"buffer available: {}, current range: {}, current offset: {}, file segment state: {}, "
"download offset: {}, read_type: {}, reading until position: {}, started with offset: {}, "
"current write offset: {}, read_type: {}, reading until position: {}, started with offset: {}, "
"remaining ranges: {}",
getHexUIntLowercase(cache_key),
working_buffer.size(),
@ -1015,7 +1014,7 @@ bool CachedOnDiskReadBufferFromFile::nextImplStep()
current_read_range.toString(),
file_offset_of_buffer_end,
FileSegment::stateToString(file_segment->state()),
file_segment->getDownloadOffset(),
file_segment->getCurrentWriteOffset(),
toString(read_type),
read_until_position,
first_offset,

4
src/Disks/IO/CachedOnDiskReadBufferFromFile.h
View File

@ -80,7 +80,7 @@ private:
void assertCorrectness() const;
std::shared_ptr<ReadBufferFromFileBase> getRemoteFSReadBuffer(FileSegmentPtr & file_segment, ReadType read_type_);
std::shared_ptr<ReadBufferFromFileBase> getRemoteFSReadBuffer(FileSegment & file_segment, ReadType read_type_);
size_t getTotalSizeToRead();
@ -90,6 +90,8 @@ private:
bool writeCache(char * data, size_t size, size_t offset, FileSegment & file_segment);
static bool canStartFromCache(size_t current_offset, const FileSegment & file_segment);
Poco::Logger * log;
FileCache::Key cache_key;
String source_file_path;

150
src/Interpreters/Cache/FileCache.cpp
View File

@ -122,7 +122,6 @@ void FileCache::initialize()
fs::create_directories(cache_base_path);
}
status_file = make_unique<StatusFile>(fs::path(cache_base_path) / "status", StatusFile::write_full_info);
is_initialized = true;
}
}
@ -258,7 +257,7 @@ FileSegments FileCache::splitRangeIntoCells(
size_t offset,
size_t size,
FileSegment::State state,
bool is_persistent,
const CreateFileSegmentSettings & settings,
std::lock_guard<std::mutex> & cache_lock)
{
assert(size > 0);
@ -275,7 +274,7 @@ FileSegments FileCache::splitRangeIntoCells(
current_cell_size = std::min(remaining_size, max_file_segment_size);
remaining_size -= current_cell_size;
auto * cell = addCell(key, current_pos, current_cell_size, state, is_persistent, cache_lock);
auto * cell = addCell(key, current_pos, current_cell_size, state, settings, cache_lock);
if (cell)
file_segments.push_back(cell->file_segment);
assert(cell);
@ -292,7 +291,7 @@ void FileCache::fillHolesWithEmptyFileSegments(
const Key & key,
const FileSegment::Range & range,
bool fill_with_detached_file_segments,
bool is_persistent,
const CreateFileSegmentSettings & settings,
std::lock_guard<std::mutex> & cache_lock)
{
/// There are segments [segment1, ..., segmentN]
@ -339,16 +338,16 @@ void FileCache::fillHolesWithEmptyFileSegments(
if (fill_with_detached_file_segments)
{
auto file_segment = std::make_shared<FileSegment>(current_pos, hole_size, key, this, FileSegment::State::EMPTY);
auto file_segment = std::make_shared<FileSegment>(current_pos, hole_size, key, this, FileSegment::State::EMPTY, settings);
{
std::lock_guard segment_lock(file_segment->mutex);
file_segment->markAsDetached(segment_lock);
std::unique_lock segment_lock(file_segment->mutex);
file_segment->detachAssumeStateFinalized(segment_lock);
}
file_segments.insert(it, file_segment);
}
else
{
file_segments.splice(it, splitRangeIntoCells(key, current_pos, hole_size, FileSegment::State::EMPTY, is_persistent, cache_lock));
file_segments.splice(it, splitRangeIntoCells(key, current_pos, hole_size, FileSegment::State::EMPTY, settings, cache_lock));
}
current_pos = segment_range.right + 1;
@ -366,22 +365,23 @@ void FileCache::fillHolesWithEmptyFileSegments(
if (fill_with_detached_file_segments)
{
auto file_segment = std::make_shared<FileSegment>(current_pos, hole_size, key, this, FileSegment::State::EMPTY);
auto file_segment = std::make_shared<FileSegment>(current_pos, hole_size, key, this, FileSegment::State::EMPTY, settings);
{
std::lock_guard segment_lock(file_segment->mutex);
file_segment->markAsDetached(segment_lock);
std::unique_lock segment_lock(file_segment->mutex);
file_segment->detachAssumeStateFinalized(segment_lock);
}
file_segments.insert(file_segments.end(), file_segment);
}
else
{
file_segments.splice(
file_segments.end(), splitRangeIntoCells(key, current_pos, hole_size, FileSegment::State::EMPTY, is_persistent, cache_lock));
file_segments.end(),
splitRangeIntoCells(key, current_pos, hole_size, FileSegment::State::EMPTY, settings, cache_lock));
}
}
}
FileSegmentsHolder FileCache::getOrSet(const Key & key, size_t offset, size_t size, bool is_persistent)
FileSegmentsHolder FileCache::getOrSet(const Key & key, size_t offset, size_t size, const CreateFileSegmentSettings & settings)
{
std::lock_guard cache_lock(mutex);
@ -398,11 +398,11 @@ FileSegmentsHolder FileCache::getOrSet(const Key & key, size_t offset, size_t si
if (file_segments.empty())
{
file_segments = splitRangeIntoCells(key, offset, size, FileSegment::State::EMPTY, is_persistent, cache_lock);
file_segments = splitRangeIntoCells(key, offset, size, FileSegment::State::EMPTY, settings, cache_lock);
}
else
{
fillHolesWithEmptyFileSegments(file_segments, key, range, /* fill_with_detached */false, is_persistent, cache_lock);
fillHolesWithEmptyFileSegments(file_segments, key, range, /* fill_with_detached */false, settings, cache_lock);
}
assert(!file_segments.empty());
@ -426,16 +426,17 @@ FileSegmentsHolder FileCache::get(const Key & key, size_t offset, size_t size)
if (file_segments.empty())
{
auto file_segment = std::make_shared<FileSegment>(offset, size, key, this, FileSegment::State::EMPTY);
auto file_segment = std::make_shared<FileSegment>(
offset, size, key, this, FileSegment::State::EMPTY, CreateFileSegmentSettings{});
{
std::lock_guard segment_lock(file_segment->mutex);
file_segment->markAsDetached(segment_lock);
std::unique_lock segment_lock(file_segment->mutex);
file_segment->detachAssumeStateFinalized(segment_lock);
}
file_segments = { file_segment };
}
else
{
fillHolesWithEmptyFileSegments(file_segments, key, range, /* fill_with_detached */true, /* is_persistent */false, cache_lock);
fillHolesWithEmptyFileSegments(file_segments, key, range, /* fill_with_detached */true, {}, cache_lock);
}
return FileSegmentsHolder(std::move(file_segments));
@ -443,7 +444,7 @@ FileSegmentsHolder FileCache::get(const Key & key, size_t offset, size_t size)
FileCache::FileSegmentCell * FileCache::addCell(
const Key & key, size_t offset, size_t size,
FileSegment::State state, bool is_persistent,
FileSegment::State state, const CreateFileSegmentSettings & settings,
std::lock_guard<std::mutex> & cache_lock)
{
/// Create a file segment cell and put it in `files` map by [key][offset].
@ -475,18 +476,23 @@ FileCache::FileSegmentCell * FileCache::addCell(
stash_records.erase({remove_priority_iter->key(), remove_priority_iter->offset()});
remove_priority_iter->removeAndGetNext(cache_lock);
}
/// For segments that do not reach the download threshold, we do not download them, but directly read them
/// For segments that do not reach the download threshold,
/// we do not download them, but directly read them
result_state = FileSegment::State::SKIP_CACHE;
}
else
{
auto priority_iter = record->second;
priority_iter->use(cache_lock);
result_state = priority_iter->hits() >= enable_cache_hits_threshold ? FileSegment::State::EMPTY : FileSegment::State::SKIP_CACHE;
result_state = priority_iter->hits() >= enable_cache_hits_threshold
? FileSegment::State::EMPTY
: FileSegment::State::SKIP_CACHE;
}
}
return std::make_shared<FileSegment>(offset, size, key, this, result_state, is_persistent);
return std::make_shared<FileSegment>(offset, size, key, this, result_state, settings);
};
FileSegmentCell cell(skip_or_download(), this, cache_lock);
@ -495,6 +501,7 @@ FileCache::FileSegmentCell * FileCache::addCell(
if (offsets.empty())
{
auto key_path = getPathInLocalCache(key);
if (!fs::exists(key_path))
fs::create_directories(key_path);
}
@ -513,7 +520,7 @@ FileSegmentPtr FileCache::createFileSegmentForDownload(
const Key & key,
size_t offset,
size_t size,
bool is_persistent,
const CreateFileSegmentSettings & settings,
std::lock_guard<std::mutex> & cache_lock)
{
#ifndef NDEBUG
@ -530,7 +537,7 @@ FileSegmentPtr FileCache::createFileSegmentForDownload(
"Cache cell already exists for key `{}` and offset {}",
key.toString(), offset);
cell = addCell(key, offset, size, FileSegment::State::EMPTY, is_persistent, cache_lock);
cell = addCell(key, offset, size, FileSegment::State::EMPTY, settings, cache_lock);
if (!cell)
throw Exception(ErrorCodes::LOGICAL_ERROR, "Failed to add a new cell for download");
@ -542,18 +549,21 @@ bool FileCache::tryReserve(const Key & key, size_t offset, size_t size, std::loc
{
auto query_context = enable_filesystem_query_cache_limit ? getCurrentQueryContext(cache_lock) : nullptr;
if (!query_context)
{
return tryReserveForMainList(key, offset, size, nullptr, cache_lock);
}
/// The maximum cache capacity of the request is not reached, thus the
//// cache block is evicted from the main LRU queue by tryReserveForMainList().
else if (query_context->getCacheSize() + size <= query_context->getMaxCacheSize())
{
return tryReserveForMainList(key, offset, size, query_context, cache_lock);
}
/// When skip_download_if_exceeds_query_cache is true, there is no need
/// to evict old data, skip the cache and read directly from remote fs.
else if (query_context->isSkipDownloadIfExceed())
{
return false;
}
/// The maximum cache size of the query is reached, the cache will be
/// evicted from the history cache accessed by the current query.
else
@ -833,7 +843,7 @@ void FileCache::removeIfExists(const Key & key)
auto file_segment = cell->file_segment;
if (file_segment)
{
std::lock_guard<std::mutex> segment_lock(file_segment->mutex);
std::unique_lock<std::mutex> segment_lock(file_segment->mutex);
file_segment->detach(cache_lock, segment_lock);
remove(file_segment->key(), file_segment->offset(), cache_lock, segment_lock);
}
@ -863,9 +873,11 @@ void FileCache::removeIfReleasable()
auto * cell = getCell(key, offset, cache_lock);
if (!cell)
{
throw Exception(
ErrorCodes::LOGICAL_ERROR,
"Cache is in inconsistent state: LRU queue contains entries with no cache cell");
}
if (cell->releasable())
{
@ -880,7 +892,7 @@ void FileCache::removeIfReleasable()
for (auto & file_segment : to_remove)
{
std::lock_guard segment_lock(file_segment->mutex);
std::unique_lock segment_lock(file_segment->mutex);
file_segment->detach(cache_lock, segment_lock);
remove(file_segment->key(), file_segment->offset(), cache_lock, segment_lock);
}
@ -896,13 +908,13 @@ void FileCache::removeIfReleasable()
void FileCache::remove(FileSegmentPtr file_segment, std::lock_guard<std::mutex> & cache_lock)
{
std::lock_guard segment_lock(file_segment->mutex);
std::unique_lock segment_lock(file_segment->mutex);
remove(file_segment->key(), file_segment->offset(), cache_lock, segment_lock);
}
void FileCache::remove(
Key key, size_t offset,
std::lock_guard<std::mutex> & cache_lock, std::lock_guard<std::mutex> & /* segment_lock */)
std::lock_guard<std::mutex> & cache_lock, std::unique_lock<std::mutex> & /* segment_lock */)
{
LOG_DEBUG(log, "Remove from cache. Key: {}, offset: {}", key.toString(), offset);
@ -976,7 +988,7 @@ void FileCache::loadCacheInfoIntoMemory(std::lock_guard<std::mutex> & cache_lock
{
if (!key_it->is_directory())
{
LOG_DEBUG(log, "Unexpected file {} (not a directory), will skip it", key_it->path().string());
LOG_DEBUG(log, "Unexpected file: {}. Expected a directory", key_it->path().string());
continue;
}
@ -1012,7 +1024,10 @@ void FileCache::loadCacheInfoIntoMemory(std::lock_guard<std::mutex> & cache_lock
if (tryReserve(key, offset, size, cache_lock))
{
auto * cell = addCell(key, offset, size, FileSegment::State::DOWNLOADED, is_persistent, cache_lock);
auto * cell = addCell(
key, offset, size, FileSegment::State::DOWNLOADED,
CreateFileSegmentSettings{ .is_persistent = is_persistent }, cache_lock);
if (cell)
queue_entries.emplace_back(cell->queue_iterator, cell->file_segment);
}
@ -1049,7 +1064,7 @@ void FileCache::loadCacheInfoIntoMemory(std::lock_guard<std::mutex> & cache_lock
void FileCache::reduceSizeToDownloaded(
const Key & key, size_t offset,
std::lock_guard<std::mutex> & cache_lock, std::lock_guard<std::mutex> & /* segment_lock */)
std::lock_guard<std::mutex> & cache_lock, std::unique_lock<std::mutex> & segment_lock)
{
/**
* In case file was partially downloaded and it's download cannot be continued
@ -1069,20 +1084,25 @@ void FileCache::reduceSizeToDownloaded(
const auto & file_segment = cell->file_segment;
size_t downloaded_size = file_segment->downloaded_size;
if (downloaded_size == file_segment->range().size())
size_t full_size = file_segment->range().size();
if (downloaded_size == full_size)
{
throw Exception(
ErrorCodes::LOGICAL_ERROR,
"Nothing to reduce, file segment fully downloaded, key: {}, offset: {}",
key.toString(), offset);
"Nothing to reduce, file segment fully downloaded: {}",
file_segment->getInfoForLogUnlocked(segment_lock));
}
cell->file_segment = std::make_shared<FileSegment>(offset, downloaded_size, key, this, FileSegment::State::DOWNLOADED);
cell->file_segment = std::make_shared<FileSegment>(
offset, downloaded_size, key, this, FileSegment::State::DOWNLOADED, CreateFileSegmentSettings{});
assert(file_segment->reserved_size == downloaded_size);
}
bool FileCache::isLastFileSegmentHolder(
const Key & key, size_t offset,
std::lock_guard<std::mutex> & cache_lock, std::lock_guard<std::mutex> & /* segment_lock */)
std::lock_guard<std::mutex> & cache_lock, std::unique_lock<std::mutex> & /* segment_lock */)
{
auto * cell = getCell(key, offset, cache_lock);
@ -1167,7 +1187,8 @@ FileCache::FileSegmentCell::FileSegmentCell(
{
case FileSegment::State::DOWNLOADED:
{
queue_iterator = cache->main_priority->add(file_segment->key(), file_segment->offset(), file_segment->range().size(), cache_lock);
queue_iterator = cache->main_priority->add(
file_segment->key(), file_segment->offset(), file_segment->range().size(), cache_lock);
break;
}
case FileSegment::State::SKIP_CACHE:
@ -1246,14 +1267,41 @@ void FileCache::assertPriorityCorrectness(std::lock_guard<std::mutex> & cache_lo
ErrorCodes::LOGICAL_ERROR,
"Cache is in inconsistent state: LRU queue contains entries with no cache cell (assertCorrectness())");
}
assert(cell->size() == size);
if (cell->size() != size)
{
throw Exception(
ErrorCodes::LOGICAL_ERROR,
"Expected {} == {} size ({})",
cell->size(), size, cell->file_segment->getInfoForLog());
}
total_size += size;
}
assert(total_size == main_priority->getCacheSize(cache_lock));
assert(main_priority->getCacheSize(cache_lock) <= max_size);
assert(main_priority->getElementsNum(cache_lock) <= max_element_size);
}
FileCache::QueryContextHolder::QueryContextHolder(
const String & query_id_,
FileCache * cache_,
FileCache::QueryContextPtr context_)
: query_id(query_id_)
, cache(cache_)
, context(context_)
{
}
FileCache::QueryContextHolder::~QueryContextHolder()
{
/// If only the query_map and the current holder hold the context_query,
/// the query has been completed and the query_context is released.
if (context && context.use_count() == 2)
cache->removeQueryContext(query_id);
}
FileCache::QueryContextPtr FileCache::getCurrentQueryContext(std::lock_guard<std::mutex> & cache_lock)
{
if (!isQueryInitialized())
@ -1362,22 +1410,4 @@ void FileCache::QueryContext::use(const Key & key, size_t offset, std::lock_guar
record->second->use(cache_lock);
}
FileCache::QueryContextHolder::QueryContextHolder(
const String & query_id_,
FileCache * cache_,
FileCache::QueryContextPtr context_)
: query_id(query_id_)
, cache(cache_)
, context(context_)
{
}
FileCache::QueryContextHolder::~QueryContextHolder()
{
/// If only the query_map and the current holder hold the context_query,
/// the query has been completed and the query_context is released.
if (context && context.use_count() == 2)
cache->removeQueryContext(query_id);
}
}

44
src/Interpreters/Cache/FileCache.h
View File

@ -12,13 +12,14 @@
#include <boost/noncopyable.hpp>
#include <Core/Types.h>
#include <Common/logger_useful.h>
#include <Common/ThreadPool.h>
#include <IO/ReadSettings.h>
#include <Interpreters/Cache/IFileCachePriority.h>
#include <Interpreters/Cache/FileCacheKey.h>
#include <Interpreters/Cache/FileCache_fwd.h>
#include <Interpreters/Cache/FileSegment.h>
#include <Interpreters/Cache/IFileCachePriority.h>
#include <Common/logger_useful.h>
#include <Interpreters/Cache/FileCacheKey.h>
#include <Common/StatusFile.h>
namespace DB
{
@ -43,7 +44,6 @@ public:
~FileCache() = default;
/// Restore cache from local filesystem.
void initialize();
const String & getBasePath() const { return cache_base_path; }
@ -59,7 +59,7 @@ public:
* As long as pointers to returned file segments are hold
* it is guaranteed that these file segments are not removed from cache.
*/
FileSegmentsHolder getOrSet(const Key & key, size_t offset, size_t size, bool is_persistent);
FileSegmentsHolder getOrSet(const Key & key, size_t offset, size_t size, const CreateFileSegmentSettings & settings);
/**
* Segments in returned list are ordered in ascending order and represent a full contiguous
@ -104,7 +104,7 @@ public:
const Key & key,
size_t offset,
size_t size,
bool is_persistent,
const CreateFileSegmentSettings & create_settings,
std::lock_guard<std::mutex> & cache_lock);
FileSegments getSnapshot() const;
@ -132,21 +132,21 @@ public:
private:
String cache_base_path;
size_t max_size;
size_t max_element_size;
size_t max_file_segment_size;
const size_t max_size;
const size_t max_element_size;
const size_t max_file_segment_size;
bool allow_persistent_files;
size_t enable_cache_hits_threshold;
bool enable_filesystem_query_cache_limit;
const bool allow_persistent_files;
const size_t enable_cache_hits_threshold;
const bool enable_filesystem_query_cache_limit;
mutable std::mutex mutex;
Poco::Logger * log;
bool is_initialized = false;
std::exception_ptr initialization_exception;
std::unique_ptr<StatusFile> status_file;
mutable std::mutex mutex;
void assertInitialized(std::lock_guard<std::mutex> & cache_lock) const;
bool tryReserve(const Key & key, size_t offset, size_t size, std::lock_guard<std::mutex> & cache_lock);
@ -154,7 +154,7 @@ private:
Key key,
size_t offset,
std::lock_guard<std::mutex> & cache_lock,
std::lock_guard<std::mutex> & segment_lock);
std::unique_lock<std::mutex> & segment_lock);
void remove(
FileSegmentPtr file_segment,
@ -164,15 +164,13 @@ private:
const Key & key,
size_t offset,
std::lock_guard<std::mutex> & cache_lock,
std::lock_guard<std::mutex> & segment_lock);
std::unique_lock<std::mutex> & segment_lock);
void reduceSizeToDownloaded(
const Key & key,
size_t offset,
std::lock_guard<std::mutex> & cache_lock,
std::lock_guard<std::mutex> & segment_lock);
void assertInitialized(std::lock_guard<std::mutex> & cache_lock) const;
std::unique_lock<std::mutex> & segment_lock);
struct FileSegmentCell : private boost::noncopyable
{
@ -225,7 +223,7 @@ private:
size_t offset,
size_t size,
FileSegment::State state,
bool is_persistent,
const CreateFileSegmentSettings & create_settings,
std::lock_guard<std::mutex> & cache_lock);
static void useCell(const FileSegmentCell & cell, FileSegments & result, std::lock_guard<std::mutex> & cache_lock);
@ -242,7 +240,7 @@ private:
size_t offset,
size_t size,
FileSegment::State state,
bool is_persistent,
const CreateFileSegmentSettings & create_settings,
std::lock_guard<std::mutex> & cache_lock);
String dumpStructureUnlocked(const Key & key_, std::lock_guard<std::mutex> & cache_lock);
@ -252,7 +250,7 @@ private:
const Key & key,
const FileSegment::Range & range,
bool fill_with_detached_file_segments,
bool is_persistent,
const CreateFileSegmentSettings & settings,
std::lock_guard<std::mutex> & cache_lock);
size_t getUsedCacheSizeUnlocked(std::lock_guard<std::mutex> & cache_lock) const;

1
src/Interpreters/Cache/FileCache_fwd.h
View File

@ -12,5 +12,6 @@ class FileCache;
using FileCachePtr = std::shared_ptr<FileCache>;
struct FileCacheSettings;
struct CreateFileSegmentSettings;
}

556
src/Interpreters/Cache/FileSegment.cpp
View File

@ -1,10 +1,10 @@
#include "FileSegment.h"
#include <base/getThreadId.h>
#include <base/scope_guard.h>
#include <Common/scope_guard_safe.h>
#include <Common/hex.h>
#include <Common/logger_useful.h>
#include <Interpreters/Cache/FileCache.h>
#include <Common/hex.h>
#include <IO/WriteBufferFromString.h>
#include <IO/Operators.h>
#include <filesystem>
@ -29,7 +29,7 @@ FileSegment::FileSegment(
const Key & key_,
FileCache * cache_,
State download_state_,
bool is_persistent_)
const CreateFileSegmentSettings & settings)
: segment_range(offset_, offset_ + size_ - 1)
, download_state(download_state_)
, file_key(key_)
@ -39,7 +39,7 @@ FileSegment::FileSegment(
#else
, log(&Poco::Logger::get("FileSegment"))
#endif
, is_persistent(is_persistent_)
, is_persistent(settings.is_persistent)
{
/// On creation, file segment state can be EMPTY, DOWNLOADED, DOWNLOADING.
switch (download_state)
@ -64,50 +64,79 @@ FileSegment::FileSegment(
}
default:
{
throw Exception(ErrorCodes::REMOTE_FS_OBJECT_CACHE_ERROR, "Can create cell with either EMPTY, DOWNLOADED, DOWNLOADING state");
throw Exception(
ErrorCodes::REMOTE_FS_OBJECT_CACHE_ERROR,
"Can create cell with either EMPTY, DOWNLOADED, DOWNLOADING state");
}
}
}
String FileSegment::getPathInLocalCache() const
{
return cache->getPathInLocalCache(key(), offset(), isPersistent());
}
FileSegment::State FileSegment::state() const
{
std::lock_guard segment_lock(mutex);
std::unique_lock segment_lock(mutex);
return download_state;
}
size_t FileSegment::getDownloadOffset() const
void FileSegment::setDownloadState(State state)
{
LOG_TEST(log, "Updated state from {} to {}", stateToString(download_state), stateToString(state));
download_state = state;
}
size_t FileSegment::getFirstNonDownloadedOffset() const
{
std::unique_lock segment_lock(mutex);
return getFirstNonDownloadedOffsetUnlocked(segment_lock);
}
size_t FileSegment::getFirstNonDownloadedOffsetUnlocked(std::unique_lock<std::mutex> & segment_lock) const
{
std::lock_guard segment_lock(mutex);
return range().left + getDownloadedSizeUnlocked(segment_lock);
}
size_t FileSegment::getCurrentWriteOffset() const
{
std::unique_lock segment_lock(mutex);
return getCurrentWriteOffsetUnlocked(segment_lock);
}
size_t FileSegment::getCurrentWriteOffsetUnlocked(std::unique_lock<std::mutex> & segment_lock) const
{
return getFirstNonDownloadedOffsetUnlocked(segment_lock);
}
size_t FileSegment::getDownloadedSize() const
{
std::lock_guard segment_lock(mutex);
std::unique_lock segment_lock(mutex);
return getDownloadedSizeUnlocked(segment_lock);
}
size_t FileSegment::getRemainingSizeToDownload() const
{
std::lock_guard segment_lock(mutex);
return range().size() - getDownloadedSizeUnlocked(segment_lock);
}
bool FileSegment::isDetached() const
{
std::lock_guard segment_lock(mutex);
return is_detached;
}
size_t FileSegment::getDownloadedSizeUnlocked(std::lock_guard<std::mutex> & /* segment_lock */) const
size_t FileSegment::getDownloadedSizeUnlocked(std::unique_lock<std::mutex> & /* segment_lock */) const
{
if (download_state == State::DOWNLOADED)
return downloaded_size;
std::lock_guard download_lock(download_mutex);
std::unique_lock download_lock(download_mutex);
return downloaded_size;
}
size_t FileSegment::getRemainingSizeToDownload() const
{
std::unique_lock segment_lock(mutex);
return range().size() - getDownloadedSizeUnlocked(segment_lock);
}
bool FileSegment::isDownloaded() const
{
std::lock_guard segment_lock(mutex);
return is_downloaded;
}
String FileSegment::getCallerId()
{
if (!CurrentThread::isInitialized()
@ -118,84 +147,106 @@ String FileSegment::getCallerId()
return std::string(CurrentThread::getQueryId()) + ":" + toString(getThreadId());
}
String FileSegment::getDownloader() const
{
std::unique_lock segment_lock(mutex);
return getDownloaderUnlocked(segment_lock);
}
String FileSegment::getDownloaderUnlocked(std::unique_lock<std::mutex> & /* segment_lock */) const
{
return downloader_id;
}
String FileSegment::getOrSetDownloader()
{
std::lock_guard segment_lock(mutex);
std::unique_lock segment_lock(mutex);
assertNotDetached(segment_lock);
assertNotDetachedUnlocked(segment_lock);
if (downloader_id.empty())
auto current_downloader = getDownloaderUnlocked(segment_lock);
if (current_downloader.empty())
{
assert(download_state != State::DOWNLOADING);
bool allow_new_downloader = download_state == State::EMPTY || download_state == State::PARTIALLY_DOWNLOADED;
if (!allow_new_downloader)
return "notAllowed:" + stateToString(download_state);
if (download_state != State::EMPTY
&& download_state != State::PARTIALLY_DOWNLOADED)
return "None";
downloader_id = getCallerId();
download_state = State::DOWNLOADING;
current_downloader = downloader_id = getCallerId();
setDownloadState(State::DOWNLOADING);
}
else if (downloader_id == getCallerId())
throw Exception(ErrorCodes::REMOTE_FS_OBJECT_CACHE_ERROR,
"Attempt to set the same downloader for segment {} for the second time", range().toString());
return downloader_id;
return current_downloader;
}
void FileSegment::resetDownloadingStateUnlocked([[maybe_unused]] std::unique_lock<std::mutex> & segment_lock)
{
assert(isDownloaderUnlocked(segment_lock));
assert(download_state == State::DOWNLOADING);
size_t current_downloaded_size = getDownloadedSizeUnlocked(segment_lock);
/// range().size() can equal 0 in case of write-though cache.
if (current_downloaded_size != 0 && current_downloaded_size == range().size())
setDownloadedUnlocked(segment_lock);
else
setDownloadState(State::PARTIALLY_DOWNLOADED);
}
void FileSegment::resetDownloader()
{
std::lock_guard segment_lock(mutex);
std::unique_lock segment_lock(mutex);
assertNotDetached(segment_lock);
assertNotDetachedUnlocked(segment_lock);
assertIsDownloaderUnlocked("resetDownloader", segment_lock);
if (downloader_id.empty())
throw Exception(ErrorCodes::REMOTE_FS_OBJECT_CACHE_ERROR, "There is no downloader");
if (getCallerId() != downloader_id)
throw Exception(ErrorCodes::REMOTE_FS_OBJECT_CACHE_ERROR, "Downloader can be reset only by downloader");
resetDownloaderImpl(segment_lock);
resetDownloadingStateUnlocked(segment_lock);
resetDownloaderUnlocked(segment_lock);
}
void FileSegment::resetDownloaderImpl(std::lock_guard<std::mutex> & segment_lock)
void FileSegment::resetDownloaderUnlocked(std::unique_lock<std::mutex> & /* segment_lock */)
{
if (getDownloadedSizeUnlocked(segment_lock) == range().size())
setDownloaded(segment_lock);
else
download_state = State::PARTIALLY_DOWNLOADED;
LOG_TEST(log, "Resetting downloader from {}", downloader_id);
downloader_id.clear();
}
String FileSegment::getDownloader() const
void FileSegment::assertIsDownloaderUnlocked(const std::string & operation, std::unique_lock<std::mutex> & segment_lock) const
{
std::lock_guard segment_lock(mutex);
return downloader_id;
auto caller = getCallerId();
auto current_downloader = getDownloaderUnlocked(segment_lock);
LOG_TEST(log, "Downloader id: {}, caller id: {}", current_downloader, caller);
if (caller != current_downloader)
{
throw Exception(
ErrorCodes::LOGICAL_ERROR,
"Operation `{}` can be done only by downloader. "
"(CallerId: {}, downloader id: {})",
operation, caller, downloader_id);
}
}
bool FileSegment::isDownloader() const
{
std::lock_guard segment_lock(mutex);
return getCallerId() == downloader_id;
std::unique_lock segment_lock(mutex);
return isDownloaderUnlocked(segment_lock);
}
bool FileSegment::isDownloaderImpl(std::lock_guard<std::mutex> & /* segment_lock */) const
bool FileSegment::isDownloaderUnlocked(std::unique_lock<std::mutex> & segment_lock) const
{
return getCallerId() == downloader_id;
return getCallerId() == getDownloaderUnlocked(segment_lock);
}
FileSegment::RemoteFileReaderPtr FileSegment::getRemoteFileReader()
{
if (!isDownloader())
throw Exception(ErrorCodes::REMOTE_FS_OBJECT_CACHE_ERROR, "Only downloader can use remote filesystem file reader");
std::unique_lock segment_lock(mutex);
assertIsDownloaderUnlocked("getRemoteFileReader", segment_lock);
return remote_file_reader;
}
FileSegment::RemoteFileReaderPtr FileSegment::extractRemoteFileReader()
{
std::lock_guard cache_lock(cache->mutex);
std::lock_guard segment_lock(mutex);
std::unique_lock segment_lock(mutex);
if (!is_detached)
{
@ -210,8 +261,8 @@ FileSegment::RemoteFileReaderPtr FileSegment::extractRemoteFileReader()
void FileSegment::setRemoteFileReader(RemoteFileReaderPtr remote_file_reader_)
{
if (!isDownloader())
throw Exception(ErrorCodes::REMOTE_FS_OBJECT_CACHE_ERROR, "Only downloader can use remote filesystem file reader");
std::unique_lock segment_lock(mutex);
assertIsDownloaderUnlocked("setRemoteFileReader", segment_lock);
if (remote_file_reader)
throw Exception(ErrorCodes::LOGICAL_ERROR, "Remote file reader already exists");
@ -221,8 +272,8 @@ void FileSegment::setRemoteFileReader(RemoteFileReaderPtr remote_file_reader_)
void FileSegment::resetRemoteFileReader()
{
if (!isDownloader())
throw Exception(ErrorCodes::REMOTE_FS_OBJECT_CACHE_ERROR, "Only downloader can use remote filesystem file reader");
std::unique_lock segment_lock(mutex);
assertIsDownloaderUnlocked("resetRemoteFileReader", segment_lock);
if (!remote_file_reader)
throw Exception(ErrorCodes::LOGICAL_ERROR, "Remote file reader does not exist");
@ -230,55 +281,59 @@ void FileSegment::resetRemoteFileReader()
remote_file_reader.reset();
}
void FileSegment::write(const char * from, size_t size, size_t offset_)
void FileSegment::write(const char * from, size_t size, size_t offset)
{
if (!size)
throw Exception(ErrorCodes::REMOTE_FS_OBJECT_CACHE_ERROR, "Writing zero size is not allowed");
if (availableSize() < size)
throw Exception(
ErrorCodes::REMOTE_FS_OBJECT_CACHE_ERROR,
"Not enough space is reserved. Available: {}, expected: {}", availableSize(), size);
if (!isDownloader())
throw Exception(
ErrorCodes::LOGICAL_ERROR,
"Only downloader can do the downloading. (CallerId: {}, DownloaderId: {})",
getCallerId(), downloader_id);
if (getDownloadedSize() == range().size())
throw Exception(
ErrorCodes::REMOTE_FS_OBJECT_CACHE_ERROR,
"Attempt to write {} bytes to offset: {}, but current file segment is already fully downloaded",
size, offset_);
auto download_offset = range().left + downloaded_size;
if (offset_ != download_offset)
throw Exception(ErrorCodes::REMOTE_FS_OBJECT_CACHE_ERROR,
"Attempt to write {} bytes to offset: {}, but current download offset is {}",
size, offset_, download_offset);
{
std::lock_guard segment_lock(mutex);
assertNotDetached(segment_lock);
}
std::unique_lock segment_lock(mutex);
if (!cache_writer)
{
if (downloaded_size > 0)
throw Exception(ErrorCodes::LOGICAL_ERROR,
"Cache writer was finalized (downloaded size: {}, state: {})",
downloaded_size, stateToString(download_state));
assertIsDownloaderUnlocked("write", segment_lock);
assertNotDetachedUnlocked(segment_lock);
auto download_path = getPathInLocalCache();
cache_writer = std::make_unique<WriteBufferFromFile>(download_path);
if (download_state != State::DOWNLOADING)
throw Exception(
ErrorCodes::LOGICAL_ERROR,
"Expected DOWNLOADING state, got {}", stateToString(download_state));
size_t first_non_downloaded_offset = getFirstNonDownloadedOffsetUnlocked(segment_lock);
if (offset != first_non_downloaded_offset)
throw Exception(
ErrorCodes::REMOTE_FS_OBJECT_CACHE_ERROR,
"Attempt to write {} bytes to offset: {}, but current write offset is {}",
size, offset, first_non_downloaded_offset);
size_t current_downloaded_size = getDownloadedSizeUnlocked(segment_lock);
chassert(reserved_size >= current_downloaded_size);
size_t free_reserved_size = reserved_size - current_downloaded_size;
if (free_reserved_size < size)
throw Exception(
ErrorCodes::REMOTE_FS_OBJECT_CACHE_ERROR,
"Not enough space is reserved. Available: {}, expected: {}", free_reserved_size, size);
if (current_downloaded_size == range().size())
throw Exception(ErrorCodes::LOGICAL_ERROR, "File segment is already fully downloaded");
if (!cache_writer)
{
if (current_downloaded_size > 0)
throw Exception(
ErrorCodes::LOGICAL_ERROR,
"Cache writer was finalized (downloaded size: {}, state: {})",
current_downloaded_size, stateToString(download_state));
auto download_path = getPathInLocalCache();
cache_writer = std::make_unique<WriteBufferFromFile>(download_path);
}
}
try
{
cache_writer->write(from, size);
std::lock_guard download_lock(download_mutex);
std::unique_lock download_lock(download_mutex);
cache_writer->next();
@ -286,23 +341,20 @@ void FileSegment::write(const char * from, size_t size, size_t offset_)
}
catch (Exception & e)
{
std::lock_guard segment_lock(mutex);
std::unique_lock segment_lock(mutex);
wrapWithCacheInfo(e, "while writing into cache", segment_lock);
setDownloadFailed(segment_lock);
setDownloadFailedUnlocked(segment_lock);
cv.notify_all();
throw;
}
assert(getDownloadOffset() == offset_ + size);
}
String FileSegment::getPathInLocalCache() const
{
return cache->getPathInLocalCache(key(), offset(), isPersistent());
#ifndef NDEBUG
chassert(getFirstNonDownloadedOffset() == offset + size);
#endif
}
FileSegment::State FileSegment::wait()
@ -324,8 +376,8 @@ FileSegment::State FileSegment::wait()
{
LOG_TEST(log, "{} waiting on: {}, current downloader: {}", getCallerId(), range().toString(), downloader_id);
assert(!downloader_id.empty());
assert(downloader_id != getCallerId());
chassert(!getDownloaderUnlocked(segment_lock).empty());
chassert(!isDownloaderUnlocked(segment_lock));
cv.wait_for(segment_lock, std::chrono::seconds(60));
}
@ -338,30 +390,23 @@ bool FileSegment::reserve(size_t size_to_reserve)
if (!size_to_reserve)
throw Exception(ErrorCodes::REMOTE_FS_OBJECT_CACHE_ERROR, "Zero space reservation is not allowed");
size_t expected_downloaded_size;
{
std::lock_guard segment_lock(mutex);
assertNotDetached(segment_lock);
std::unique_lock segment_lock(mutex);
auto caller_id = getCallerId();
bool is_downloader = caller_id == downloader_id;
if (!is_downloader)
{
throw Exception(
ErrorCodes::LOGICAL_ERROR,
"Space can be reserved only by downloader (current: {}, expected: {})",
caller_id, downloader_id);
}
assertNotDetachedUnlocked(segment_lock);
assertIsDownloaderUnlocked("reserve", segment_lock);
size_t current_downloaded_size = getDownloadedSizeUnlocked(segment_lock);
if (current_downloaded_size + size_to_reserve > range().size())
{
expected_downloaded_size = getDownloadedSizeUnlocked(segment_lock);
if (expected_downloaded_size + size_to_reserve > range().size())
throw Exception(
ErrorCodes::REMOTE_FS_OBJECT_CACHE_ERROR,
"Attempt to reserve space too much space: {} ({})",
size_to_reserve, getInfoForLogImpl(segment_lock));
}
"Attempt to reserve space too much space ({}) for file segment with range: {} (downloaded size: {})",
size_to_reserve, range().toString(), downloaded_size);
assert(reserved_size >= current_downloaded_size);
chassert(reserved_size >= expected_downloaded_size);
}
/**
@ -370,9 +415,7 @@ bool FileSegment::reserve(size_t size_to_reserve)
* and the caller is going to continue;
*/
size_t current_downloaded_size = getDownloadedSize();
assert(reserved_size >= current_downloaded_size);
size_t already_reserved_size = reserved_size - current_downloaded_size;
size_t already_reserved_size = reserved_size - expected_downloaded_size;
bool reserved = already_reserved_size >= size_to_reserve;
if (!reserved)
@ -392,23 +435,13 @@ bool FileSegment::reserve(size_t size_to_reserve)
return reserved;
}
bool FileSegment::isDownloaded() const
{
std::lock_guard segment_lock(mutex);
return isDownloadedUnlocked(segment_lock);
}
bool FileSegment::isDownloadedUnlocked(std::lock_guard<std::mutex> & /* segment_lock */) const
{
return is_downloaded;
}
void FileSegment::setDownloaded([[maybe_unused]] std::lock_guard<std::mutex> & segment_lock)
void FileSegment::setDownloadedUnlocked([[maybe_unused]] std::unique_lock<std::mutex> & segment_lock)
{
if (is_downloaded)
return;
downloader_id.clear();
setDownloadState(State::DOWNLOADED);
is_downloaded = true;
if (cache_writer)
{
@ -424,10 +457,12 @@ void FileSegment::setDownloaded([[maybe_unused]] std::lock_guard<std::mutex> & s
assert(std::filesystem::file_size(getPathInLocalCache()) > 0);
}
void FileSegment::setDownloadFailed(std::lock_guard<std::mutex> & /* segment_lock */)
void FileSegment::setDownloadFailedUnlocked(std::unique_lock<std::mutex> & segment_lock)
{
download_state = State::PARTIALLY_DOWNLOADED_NO_CONTINUATION;
downloader_id.clear();
LOG_INFO(log, "Settings download as failed: {}", getInfoForLogUnlocked(segment_lock));
setDownloadState(State::PARTIALLY_DOWNLOADED_NO_CONTINUATION);
resetDownloaderUnlocked(segment_lock);
if (cache_writer)
{
@ -437,43 +472,31 @@ void FileSegment::setDownloadFailed(std::lock_guard<std::mutex> & /* segment_loc
}
}
void FileSegment::completeBatchAndResetDownloader()
void FileSegment::completePartAndResetDownloader()
{
std::lock_guard segment_lock(mutex);
std::unique_lock segment_lock(mutex);
completePartAndResetDownloaderUnlocked(segment_lock);
}
assertNotDetached(segment_lock);
void FileSegment::completePartAndResetDownloaderUnlocked(std::unique_lock<std::mutex> & segment_lock)
{
assertNotDetachedUnlocked(segment_lock);
assertIsDownloaderUnlocked("completePartAndResetDownloader", segment_lock);
if (!isDownloaderImpl(segment_lock))
{
cv.notify_all();
throw Exception(
ErrorCodes::REMOTE_FS_OBJECT_CACHE_ERROR,
"File segment can be completed only by downloader ({} != {})",
downloader_id, getCallerId());
}
resetDownloaderImpl(segment_lock);
LOG_TEST(log, "Complete batch. Current downloaded size: {}", getDownloadedSizeUnlocked(segment_lock));
resetDownloadingStateUnlocked(segment_lock);
resetDownloaderUnlocked(segment_lock);
LOG_TEST(log, "Complete batch. ({})", getInfoForLogUnlocked(segment_lock));
cv.notify_all();
}
void FileSegment::completeWithState(State state)
{
std::lock_guard cache_lock(cache->mutex);
std::lock_guard segment_lock(mutex);
std::unique_lock segment_lock(mutex);
assertNotDetached(segment_lock);
auto caller_id = getCallerId();
if (caller_id != downloader_id)
{
throw Exception(
ErrorCodes::LOGICAL_ERROR,
"File segment completion can be done only by downloader. (CallerId: {}, downloader id: {}",
caller_id, downloader_id);
}
assertNotDetachedUnlocked(segment_lock);
assertIsDownloaderUnlocked("complete", segment_lock);
if (state != State::DOWNLOADED
&& state != State::PARTIALLY_DOWNLOADED
@ -485,24 +508,29 @@ void FileSegment::completeWithState(State state)
"Cannot complete file segment with state: {}", stateToString(state));
}
download_state = state;
setDownloadState(state);
completeBasedOnCurrentState(cache_lock, segment_lock);
}
void FileSegment::completeWithoutState(std::lock_guard<std::mutex> & cache_lock)
void FileSegment::completeWithoutState()
{
std::lock_guard segment_lock(mutex);
std::lock_guard cache_lock(cache->mutex);
completeWithoutStateUnlocked(cache_lock);
}
void FileSegment::completeWithoutStateUnlocked(std::lock_guard<std::mutex> & cache_lock)
{
std::unique_lock segment_lock(mutex);
completeBasedOnCurrentState(cache_lock, segment_lock);
}
void FileSegment::completeBasedOnCurrentState(std::lock_guard<std::mutex> & cache_lock, std::lock_guard<std::mutex> & segment_lock)
void FileSegment::completeBasedOnCurrentState(std::lock_guard<std::mutex> & cache_lock, std::unique_lock<std::mutex> & segment_lock)
{
if (is_detached)
return;
bool is_downloader = isDownloaderImpl(segment_lock);
bool is_downloader = isDownloaderUnlocked(segment_lock);
bool is_last_holder = cache->isLastFileSegmentHolder(key(), offset(), cache_lock, segment_lock);
bool can_update_segment_state = is_downloader || is_last_holder;
size_t current_downloaded_size = getDownloadedSizeUnlocked(segment_lock);
SCOPE_EXIT({
@ -512,16 +540,16 @@ void FileSegment::completeBasedOnCurrentState(std::lock_guard<std::mutex> & cach
}
});
LOG_TEST(log, "Complete without state (is_last_holder: {}). File segment info: {}", is_last_holder, getInfoForLogImpl(segment_lock));
LOG_TEST(
log,
"Complete based on current state (is_last_holder: {}, {})",
is_last_holder, getInfoForLogUnlocked(segment_lock));
if (can_update_segment_state)
if (is_downloader)
{
if (current_downloaded_size == range().size())
setDownloaded(segment_lock);
else
download_state = State::PARTIALLY_DOWNLOADED;
resetDownloaderImpl(segment_lock);
if (download_state == State::DOWNLOADING) /// != in case of completeWithState
resetDownloadingStateUnlocked(segment_lock);
resetDownloaderUnlocked(segment_lock);
}
switch (download_state)
@ -535,16 +563,17 @@ void FileSegment::completeBasedOnCurrentState(std::lock_guard<std::mutex> & cach
}
case State::DOWNLOADED:
{
assert(getDownloadedSizeUnlocked(segment_lock) == range().size());
assert(isDownloadedUnlocked(segment_lock));
chassert(getDownloadedSizeUnlocked(segment_lock) == range().size());
assert(is_downloaded);
assert(!cache_writer);
break;
}
case State::DOWNLOADING:
case State::EMPTY:
{
assert(!is_last_holder);
chassert(!is_last_holder);
break;
}
case State::EMPTY:
case State::PARTIALLY_DOWNLOADED:
case State::PARTIALLY_DOWNLOADED_NO_CONTINUATION:
{
@ -554,7 +583,7 @@ void FileSegment::completeBasedOnCurrentState(std::lock_guard<std::mutex> & cach
{
LOG_TEST(log, "Remove cell {} (nothing downloaded)", range().toString());
download_state = State::SKIP_CACHE;
setDownloadState(State::SKIP_CACHE);
cache->remove(key(), offset(), cache_lock, segment_lock);
}
else
@ -567,7 +596,7 @@ void FileSegment::completeBasedOnCurrentState(std::lock_guard<std::mutex> & cach
* in FileSegmentsHolder represent a contiguous range, so we can resize
* it only when nobody needs it.
*/
download_state = State::PARTIALLY_DOWNLOADED_NO_CONTINUATION;
setDownloadState(State::PARTIALLY_DOWNLOADED_NO_CONTINUATION);
/// Resize this file segment by creating a copy file segment with DOWNLOADED state,
/// but current file segment should remain PARRTIALLY_DOWNLOADED_NO_CONTINUATION and with detached state,
@ -576,23 +605,22 @@ void FileSegment::completeBasedOnCurrentState(std::lock_guard<std::mutex> & cach
cache->reduceSizeToDownloaded(key(), offset(), cache_lock, segment_lock);
}
markAsDetached(segment_lock);
detachAssumeStateFinalized(segment_lock);
}
break;
}
}
LOG_TEST(log, "Completed file segment: {}", getInfoForLogImpl(segment_lock));
assertCorrectnessImpl(segment_lock);
LOG_TEST(log, "Completed file segment: {}", getInfoForLogUnlocked(segment_lock));
}
String FileSegment::getInfoForLog() const
{
std::lock_guard segment_lock(mutex);
return getInfoForLogImpl(segment_lock);
std::unique_lock segment_lock(mutex);
return getInfoForLogUnlocked(segment_lock);
}
String FileSegment::getInfoForLogImpl(std::lock_guard<std::mutex> & segment_lock) const
String FileSegment::getInfoForLogUnlocked(std::unique_lock<std::mutex> & segment_lock) const
{
WriteBufferFromOwnString info;
info << "File segment: " << range().toString() << ", ";
@ -601,15 +629,18 @@ String FileSegment::getInfoForLogImpl(std::lock_guard<std::mutex> & segment_lock
info << "downloaded size: " << getDownloadedSizeUnlocked(segment_lock) << ", ";
info << "reserved size: " << reserved_size << ", ";
info << "downloader id: " << (downloader_id.empty() ? "None" : downloader_id) << ", ";
info << "current write offset: " << getCurrentWriteOffsetUnlocked(segment_lock) << ", ";
info << "first non-downloaded offset: " << getFirstNonDownloadedOffsetUnlocked(segment_lock) << ", ";
info << "caller id: " << getCallerId() << ", ";
info << "detached: " << is_detached << ", ";
info << "persistent: " << is_persistent;
return info.str();
}
void FileSegment::wrapWithCacheInfo(Exception & e, const String & message, std::lock_guard<std::mutex> & segment_lock) const
void FileSegment::wrapWithCacheInfo(Exception & e, const String & message, std::unique_lock<std::mutex> & segment_lock) const
{
e.addMessage(fmt::format("{}, current cache state: {}", message, getInfoForLogImpl(segment_lock)));
e.addMessage(fmt::format("{}, current cache state: {}", message, getInfoForLogUnlocked(segment_lock)));
}
String FileSegment::stateToString(FileSegment::State state)
@ -634,63 +665,64 @@ String FileSegment::stateToString(FileSegment::State state)
void FileSegment::assertCorrectness() const
{
std::lock_guard segment_lock(mutex);
assertCorrectnessImpl(segment_lock);
std::unique_lock segment_lock(mutex);
assertCorrectnessUnlocked(segment_lock);
}
void FileSegment::assertCorrectnessImpl(std::lock_guard<std::mutex> & /* segment_lock */) const
void FileSegment::assertCorrectnessUnlocked(std::unique_lock<std::mutex> & segment_lock) const
{
assert(downloader_id.empty() == (download_state != FileSegment::State::DOWNLOADING));
assert(!downloader_id.empty() == (download_state == FileSegment::State::DOWNLOADING));
assert(download_state != FileSegment::State::DOWNLOADED || std::filesystem::file_size(getPathInLocalCache()) > 0);
auto current_downloader = getDownloaderUnlocked(segment_lock);
chassert(current_downloader.empty() == (download_state != FileSegment::State::DOWNLOADING));
chassert(!current_downloader.empty() == (download_state == FileSegment::State::DOWNLOADING));
chassert(download_state != FileSegment::State::DOWNLOADED || std::filesystem::file_size(getPathInLocalCache()) > 0);
}
void FileSegment::throwIfDetached() const
{
std::lock_guard segment_lock(mutex);
throwIfDetachedUnlocked(segment_lock);
}
void FileSegment::throwIfDetachedUnlocked(std::lock_guard<std::mutex> & segment_lock) const
void FileSegment::throwIfDetachedUnlocked(std::unique_lock<std::mutex> & segment_lock) const
{
throw Exception(
ErrorCodes::LOGICAL_ERROR,
"Cache file segment is in detached state, operation not allowed. "
"It can happen when cache was concurrently dropped with SYSTEM DROP FILESYSTEM CACHE FORCE. "
"Please, retry. File segment info: {}", getInfoForLogImpl(segment_lock));
"Please, retry. File segment info: {}", getInfoForLogUnlocked(segment_lock));
}
void FileSegment::assertNotDetached() const
{
std::unique_lock segment_lock(mutex);
assertNotDetachedUnlocked(segment_lock);
}
void FileSegment::assertNotDetached(std::lock_guard<std::mutex> & segment_lock) const
void FileSegment::assertNotDetachedUnlocked(std::unique_lock<std::mutex> & segment_lock) const
{
if (is_detached)
throwIfDetachedUnlocked(segment_lock);
}
void FileSegment::assertDetachedStatus(std::lock_guard<std::mutex> & segment_lock) const
void FileSegment::assertDetachedStatus(std::unique_lock<std::mutex> & segment_lock) const
{
/// Detached file segment is allowed to have only a certain subset of states.
/// It should be either EMPTY or one of the finalized states.
if (download_state != State::EMPTY && !hasFinalizedState())
if (download_state != State::EMPTY && !hasFinalizedStateUnlocked(segment_lock))
{
throw Exception(
ErrorCodes::LOGICAL_ERROR,
"Detached file segment has incorrect state: {}",
getInfoForLogImpl(segment_lock));
getInfoForLogUnlocked(segment_lock));
}
}
FileSegmentPtr FileSegment::getSnapshot(const FileSegmentPtr & file_segment, std::lock_guard<std::mutex> & /* cache_lock */)
{
std::lock_guard segment_lock(file_segment->mutex);
std::unique_lock segment_lock(file_segment->mutex);
auto snapshot = std::make_shared<FileSegment>(
file_segment->offset(),
file_segment->range().size(),
file_segment->key(),
nullptr,
State::EMPTY);
State::EMPTY,
CreateFileSegmentSettings{});
snapshot->hits_count = file_segment->getHitsCount();
snapshot->ref_count = file_segment.use_count();
@ -701,41 +733,43 @@ FileSegmentPtr FileSegment::getSnapshot(const FileSegmentPtr & file_segment, std
return snapshot;
}
bool FileSegment::hasFinalizedState() const
bool FileSegment::hasFinalizedStateUnlocked(std::unique_lock<std::mutex> & /* segment_lock */) const
{
return download_state == State::DOWNLOADED
|| download_state == State::PARTIALLY_DOWNLOADED_NO_CONTINUATION
|| download_state == State::SKIP_CACHE;
}
void FileSegment::detach(
std::lock_guard<std::mutex> & /* cache_lock */,
std::lock_guard<std::mutex> & segment_lock)
bool FileSegment::isDetached() const
{
std::unique_lock segment_lock(mutex);
return is_detached;
}
void FileSegment::detach(std::lock_guard<std::mutex> & /* cache_lock */, std::unique_lock<std::mutex> & segment_lock)
{
/// Now detached status can be in 2 cases, which do not do any complex logic:
/// 1. there is only 1 remaining file segment holder
/// && it does not need this segment anymore
/// && this file segment was in cache and needs to be removed
/// 2. in read_from_cache_if_exists_otherwise_bypass_cache case
if (is_detached)
return;
markAsDetached(segment_lock);
download_state = State::PARTIALLY_DOWNLOADED_NO_CONTINUATION;
downloader_id.clear();
if (download_state == State::DOWNLOADING)
resetDownloadingStateUnlocked(segment_lock);
else
setDownloadState(State::PARTIALLY_DOWNLOADED_NO_CONTINUATION);
LOG_DEBUG(log, "Detached file segment: {}", getInfoForLogImpl(segment_lock));
resetDownloaderUnlocked(segment_lock);
detachAssumeStateFinalized(segment_lock);
}
void FileSegment::markAsDetached(std::lock_guard<std::mutex> & /* segment_lock */)
void FileSegment::detachAssumeStateFinalized(std::unique_lock<std::mutex> & segment_lock)
{
is_detached = true;
CurrentMetrics::add(CurrentMetrics::CacheDetachedFileSegments);
LOG_TEST(log, "Detached file segment: {}", getInfoForLogUnlocked(segment_lock));
}
FileSegment::~FileSegment()
{
std::lock_guard segment_lock(mutex);
std::unique_lock segment_lock(mutex);
if (is_detached)
CurrentMetrics::sub(CurrentMetrics::CacheDetachedFileSegments);
}
@ -761,7 +795,7 @@ FileSegmentsHolder::~FileSegmentsHolder()
bool is_detached = false;
{
std::lock_guard segment_lock(file_segment->mutex);
std::unique_lock segment_lock(file_segment->mutex);
is_detached = file_segment->isDetached(segment_lock);
if (is_detached)
file_segment->assertDetachedStatus(segment_lock);
@ -779,7 +813,7 @@ FileSegmentsHolder::~FileSegmentsHolder()
/// under the same mutex, because complete() checks for segment pointers.
std::lock_guard cache_lock(cache->mutex);
file_segment->completeWithoutState(cache_lock);
file_segment->completeWithoutStateUnlocked(cache_lock);
file_segment_it = file_segments.erase(current_file_segment_it);
}
@ -822,10 +856,16 @@ FileSegments::iterator FileSegmentRangeWriter::allocateFileSegment(size_t offset
std::lock_guard cache_lock(cache->mutex);
CreateFileSegmentSettings create_settings
{
.is_persistent = is_persistent,
};
/// We set max_file_segment_size to be downloaded,
/// if we have less size to write, file segment will be resized in complete() method.
auto file_segment = cache->createFileSegmentForDownload(
key, offset, cache->max_file_segment_size, is_persistent, cache_lock);
key, offset, cache->max_file_segment_size, create_settings, cache_lock);
return file_segments_holder.add(std::move(file_segment));
}
@ -850,19 +890,18 @@ void FileSegmentRangeWriter::completeFileSegment(FileSegment & file_segment)
/// and therefore cannot be concurrently accessed. Nevertheless, it can be
/// accessed by cache system tables if someone read from them,
/// therefore we need a mutex.
std::lock_guard segment_lock(file_segment.mutex);
std::unique_lock segment_lock(file_segment.mutex);
assert(current_downloaded_size <= file_segment.range().size());
file_segment.segment_range = FileSegment::Range(
file_segment.segment_range.left,
file_segment.segment_range.left + current_downloaded_size - 1);
file_segment.reserved_size = current_downloaded_size;
file_segment.setDownloadedUnlocked(segment_lock);
}
{
std::lock_guard cache_lock(cache->mutex);
file_segment.completeWithoutState(cache_lock);
}
file_segment.completeWithoutState();
on_complete_file_segment_func(file_segment);
}
@ -893,18 +932,20 @@ bool FileSegmentRangeWriter::write(const char * data, size_t size, size_t offset
offset, current_file_segment_write_offset);
}
size_t current_write_offset = (*current_file_segment_it)->getCurrentWriteOffset();
auto current_file_segment = *current_file_segment_it;
if (current_file_segment->getRemainingSizeToDownload() == 0)
{
completeFileSegment(*current_file_segment);
current_file_segment_it = allocateFileSegment(current_file_segment_write_offset, is_persistent);
}
else if (current_file_segment->getDownloadOffset() != offset)
else if (current_write_offset != offset)
{
throw Exception(
ErrorCodes::LOGICAL_ERROR,
"Cannot file segment download offset {} does not match current write offset {}",
current_file_segment->getDownloadOffset(), offset);
current_write_offset, offset);
}
}
@ -915,7 +956,10 @@ bool FileSegmentRangeWriter::write(const char * data, size_t size, size_t offset
throw Exception(ErrorCodes::LOGICAL_ERROR, "Failed to set a downloader. ({})", file_segment->getInfoForLog());
SCOPE_EXIT({
file_segment->resetDownloader();
if (file_segment->isDownloader())
{
file_segment->completePartAndResetDownloader();
}
});
bool reserved = file_segment->reserve(size);
@ -932,7 +976,17 @@ bool FileSegmentRangeWriter::write(const char * data, size_t size, size_t offset
return false;
}
(*current_file_segment_it)->write(data, size, offset);
try
{
file_segment->write(data, size, offset);
}
catch (...)
{
file_segment->completePartAndResetDownloader();
throw;
}
file_segment->completePartAndResetDownloader();
current_file_segment_write_offset += size;
return true;

199
src/Interpreters/Cache/FileSegment.h
View File

@ -1,11 +1,15 @@
#pragma once
#include <Core/Types.h>
#include <boost/noncopyable.hpp>
#include <Interpreters/Cache/FileCacheKey.h>
#include <IO/WriteBufferFromFile.h>
#include <IO/ReadBufferFromFileBase.h>
#include <IO/WriteBufferFromString.h>
#include <IO/Operators.h>
#include <base/getThreadId.h>
#include <list>
#include <Interpreters/Cache/FileCacheKey.h>
#include <queue>
namespace Poco { class Logger; }
@ -26,17 +30,25 @@ using FileSegmentPtr = std::shared_ptr<FileSegment>;
using FileSegments = std::list<FileSegmentPtr>;
class FileSegment : boost::noncopyable
struct CreateFileSegmentSettings
{
bool is_persistent = false;
};
class FileSegment : private boost::noncopyable, public std::enable_shared_from_this<FileSegment>
{
friend class FileCache;
friend struct FileSegmentsHolder;
friend class FileSegmentRangeWriter;
friend class StorageSystemFilesystemCache;
public:
using Key = FileCacheKey;
using RemoteFileReaderPtr = std::shared_ptr<ReadBufferFromFileBase>;
using LocalCacheWriterPtr = std::unique_ptr<WriteBufferFromFile>;
using Downloader = std::string;
using DownloaderId = std::string;
enum class State
{
@ -78,7 +90,7 @@ public:
const Key & key_,
FileCache * cache_,
State download_state_,
bool is_persistent_ = false);
const CreateFileSegmentSettings & create_settings);
~FileSegment();
@ -101,6 +113,14 @@ public:
String toString() const { return fmt::format("[{}, {}]", std::to_string(left), std::to_string(right)); }
};
static String getCallerId();
String getInfoForLog() const;
/**
* ========== Methods to get file segment's constant state ==================
*/
const Range & range() const { return segment_range; }
const Key & key() const { return file_key; }
@ -109,11 +129,85 @@ public:
bool isPersistent() const { return is_persistent; }
using UniqueId = std::pair<FileCacheKey, size_t>;
UniqueId getUniqueId() const { return std::pair(key(), offset()); }
String getPathInLocalCache() const;
/**
* ========== Methods for _any_ file segment's owner ========================
*/
String getOrSetDownloader();
bool isDownloader() const;
DownloaderId getDownloader() const;
/// Wait for the change of state from DOWNLOADING to any other.
State wait();
bool reserve(size_t size);
bool isDownloaded() const;
void write(const char * from, size_t size, size_t offset_);
size_t getHitsCount() const { return hits_count; }
size_t getRefCount() const { return ref_count; }
void incrementHitsCount() { ++hits_count; }
size_t getCurrentWriteOffset() const;
size_t getFirstNonDownloadedOffset() const;
size_t getDownloadedSize() const;
/// Now detached status can be used in the following cases:
/// 1. there is only 1 remaining file segment holder
/// && it does not need this segment anymore
/// && this file segment was in cache and needs to be removed
/// 2. in read_from_cache_if_exists_otherwise_bypass_cache case to create NOOP file segments.
/// 3. removeIfExists - method which removes file segments from cache even though
/// it might be used at the moment.
/// If file segment is detached it means the following:
/// 1. It is not present in FileCache, e.g. will not be visible to any cache user apart from
/// those who acquired shared pointer to this file segment before it was detached.
/// 2. Detached file segment can still be hold by some cache users, but it's state became
/// immutable at the point it was detached, any non-const / stateful method will throw an
/// exception.
void detach(std::lock_guard<std::mutex> & cache_lock, std::unique_lock<std::mutex> & segment_lock);
static FileSegmentPtr getSnapshot(const FileSegmentPtr & file_segment, std::lock_guard<std::mutex> & cache_lock);
bool isDetached() const;
void assertCorrectness() const;
/**
* ========== Methods for _only_ file segment's `writer` ======================
*/
void synchronousWrite(const char * from, size_t size, size_t offset);
/**
* ========== Methods for _only_ file segment's `downloader` ==================
*/
/// Try to reserve exactly `size` bytes.
bool reserve(size_t size_to_reserve);
/// Write data into reserved space.
void write(const char * from, size_t size, size_t offset);
/// Complete file segment with a certain state.
void completeWithState(State state);
void completeWithoutState();
/// Complete file segment's part which was last written.
void completePartAndResetDownloader();
void resetDownloader();
RemoteFileReaderPtr getRemoteFileReader();
@ -123,91 +217,55 @@ public:
void resetRemoteFileReader();
String getOrSetDownloader();
String getDownloader() const;
void resetDownloader();
bool isDownloader() const;
bool isDownloaded() const;
static String getCallerId();
size_t getDownloadOffset() const;
size_t getDownloadedSize() const;
size_t getRemainingSizeToDownload() const;
void completeBatchAndResetDownloader();
void completeWithState(State state);
String getInfoForLog() const;
size_t getHitsCount() const { return hits_count; }
size_t getRefCount() const { return ref_count; }
void incrementHitsCount() { ++hits_count; }
void assertCorrectness() const;
static FileSegmentPtr getSnapshot(
const FileSegmentPtr & file_segment,
std::lock_guard<std::mutex> & cache_lock);
void detach(
std::lock_guard<std::mutex> & cache_lock,
std::lock_guard<std::mutex> & segment_lock);
[[noreturn]] void throwIfDetached() const;
bool isDetached() const;
String getPathInLocalCache() const;
private:
size_t availableSize() const { return reserved_size - downloaded_size; }
size_t getFirstNonDownloadedOffsetUnlocked(std::unique_lock<std::mutex> & segment_lock) const;
size_t getCurrentWriteOffsetUnlocked(std::unique_lock<std::mutex> & segment_lock) const;
size_t getDownloadedSizeUnlocked(std::unique_lock<std::mutex> & segment_lock) const;
size_t getDownloadedSizeUnlocked(std::lock_guard<std::mutex> & segment_lock) const;
String getInfoForLogImpl(std::lock_guard<std::mutex> & segment_lock) const;
void assertCorrectnessImpl(std::lock_guard<std::mutex> & segment_lock) const;
bool hasFinalizedState() const;
String getInfoForLogUnlocked(std::unique_lock<std::mutex> & segment_lock) const;
bool isDetached(std::lock_guard<std::mutex> & /* segment_lock */) const { return is_detached; }
void markAsDetached(std::lock_guard<std::mutex> & segment_lock);
[[noreturn]] void throwIfDetachedUnlocked(std::lock_guard<std::mutex> & segment_lock) const;
String getDownloaderUnlocked(std::unique_lock<std::mutex> & segment_lock) const;
void resetDownloaderUnlocked(std::unique_lock<std::mutex> & segment_lock);
void resetDownloadingStateUnlocked(std::unique_lock<std::mutex> & segment_lock);
void assertDetachedStatus(std::lock_guard<std::mutex> & segment_lock) const;
void assertNotDetached(std::lock_guard<std::mutex> & segment_lock) const;
void setDownloadState(State state);
void setDownloaded(std::lock_guard<std::mutex> & segment_lock);
void setDownloadFailed(std::lock_guard<std::mutex> & segment_lock);
bool isDownloaderImpl(std::lock_guard<std::mutex> & segment_lock) const;
void setDownloadedUnlocked(std::unique_lock<std::mutex> & segment_lock);
void setDownloadFailedUnlocked(std::unique_lock<std::mutex> & segment_lock);
bool isDownloadedUnlocked(std::lock_guard<std::mutex> & segment_lock) const;
bool hasFinalizedStateUnlocked(std::unique_lock<std::mutex> & segment_lock) const;
void wrapWithCacheInfo(Exception & e, const String & message, std::lock_guard<std::mutex> & segment_lock) const;
bool isDownloaderUnlocked(std::unique_lock<std::mutex> & segment_lock) const;
bool lastFileSegmentHolder() const;
bool isDetached(std::unique_lock<std::mutex> & /* segment_lock */) const { return is_detached; }
void detachAssumeStateFinalized(std::unique_lock<std::mutex> & segment_lock);
[[noreturn]] void throwIfDetachedUnlocked(std::unique_lock<std::mutex> & segment_lock) const;
void assertDetachedStatus(std::unique_lock<std::mutex> & segment_lock) const;
void assertNotDetached() const;
void assertNotDetachedUnlocked(std::unique_lock<std::mutex> & segment_lock) const;
void assertIsDownloaderUnlocked(const std::string & operation, std::unique_lock<std::mutex> & segment_lock) const;
void assertCorrectnessUnlocked(std::unique_lock<std::mutex> & segment_lock) const;
/// complete() without any completion state is called from destructor of
/// FileSegmentsHolder. complete() might check if the caller of the method
/// is the last alive holder of the segment. Therefore, complete() and destruction
/// of the file segment pointer must be done under the same cache mutex.
void completeBasedOnCurrentState(std::lock_guard<std::mutex> & cache_lock, std::lock_guard<std::mutex> & segment_lock);
void completeWithoutState(std::lock_guard<std::mutex> & cache_lock);
void completeWithoutStateUnlocked(std::lock_guard<std::mutex> & cache_lock);
void completeBasedOnCurrentState(std::lock_guard<std::mutex> & cache_lock, std::unique_lock<std::mutex> & segment_lock);
void resetDownloaderImpl(std::lock_guard<std::mutex> & segment_lock);
void completePartAndResetDownloaderUnlocked(std::unique_lock<std::mutex> & segment_lock);
void wrapWithCacheInfo(Exception & e, const String & message, std::unique_lock<std::mutex> & segment_lock) const;
Range segment_range;
State download_state;
String downloader_id;
/// The one who prepares the download
DownloaderId downloader_id;
RemoteFileReaderPtr remote_file_reader;
LocalCacheWriterPtr cache_writer;
@ -245,6 +303,7 @@ private:
std::atomic<size_t> ref_count = 0; /// Used for getting snapshot state
bool is_persistent;
CurrentMetrics::Increment metric_increment{CurrentMetrics::CacheFileSegments};
};

57
src/Interpreters/tests/gtest_lru_file_cache.cpp
View File

@ -3,9 +3,9 @@
#include <gtest/gtest.h>
#include <Interpreters/Cache/FileCache.h>
#include <Interpreters/Cache/FileSegment.h>
#include <Interpreters/Cache/FileCacheSettings.h>
#include <Common/CurrentThread.h>
#include <Common/filesystemHelpers.h>
#include <Interpreters/Cache/FileCacheSettings.h>
#include <Common/tests/gtest_global_context.h>
#include <Common/SipHash.h>
#include <Common/hex.h>
@ -64,7 +64,7 @@ void download(DB::FileSegmentPtr file_segment)
fs::create_directories(subdir);
std::string data(size, '0');
file_segment->write(data.data(), size, file_segment->getDownloadOffset());
file_segment->write(data.data(), size, file_segment->getCurrentWriteOffset());
}
void prepareAndDownload(DB::FileSegmentPtr file_segment)
@ -89,6 +89,7 @@ TEST(FileCache, get)
{
if (fs::exists(cache_base_path))
fs::remove_all(cache_base_path);
fs::create_directories(cache_base_path);
DB::ThreadStatus thread_status;
@ -109,7 +110,7 @@ TEST(FileCache, get)
auto key = cache.hash("key1");
{
auto holder = cache.getOrSet(key, 0, 10, false); /// Add range [0, 9]
auto holder = cache.getOrSet(key, 0, 10, {}); /// Add range [0, 9]
auto segments = fromHolder(holder);
/// Range was not present in cache. It should be added in cache as one while file segment.
ASSERT_EQ(segments.size(), 1);
@ -138,7 +139,7 @@ TEST(FileCache, get)
{
/// Want range [5, 14], but [0, 9] already in cache, so only [10, 14] will be put in cache.
auto holder = cache.getOrSet(key, 5, 10, false);
auto holder = cache.getOrSet(key, 5, 10, {});
auto segments = fromHolder(holder);
ASSERT_EQ(segments.size(), 2);
@ -158,14 +159,14 @@ TEST(FileCache, get)
ASSERT_EQ(cache.getUsedCacheSize(), 15);
{
auto holder = cache.getOrSet(key, 9, 1, false); /// Get [9, 9]
auto holder = cache.getOrSet(key, 9, 1, {}); /// Get [9, 9]
auto segments = fromHolder(holder);
ASSERT_EQ(segments.size(), 1);
assertRange(7, segments[0], DB::FileSegment::Range(0, 9), DB::FileSegment::State::DOWNLOADED);
}
{
auto holder = cache.getOrSet(key, 9, 2, false); /// Get [9, 10]
auto holder = cache.getOrSet(key, 9, 2, {}); /// Get [9, 10]
auto segments = fromHolder(holder);
ASSERT_EQ(segments.size(), 2);
assertRange(8, segments[0], DB::FileSegment::Range(0, 9), DB::FileSegment::State::DOWNLOADED);
@ -173,15 +174,15 @@ TEST(FileCache, get)
}
{
auto holder = cache.getOrSet(key, 10, 1, false); /// Get [10, 10]
auto holder = cache.getOrSet(key, 10, 1, {}); /// Get [10, 10]
auto segments = fromHolder(holder);
ASSERT_EQ(segments.size(), 1);
assertRange(10, segments[0], DB::FileSegment::Range(10, 14), DB::FileSegment::State::DOWNLOADED);
}
complete(cache.getOrSet(key, 17, 4, false)); /// Get [17, 20]
complete(cache.getOrSet(key, 24, 3, false)); /// Get [24, 26]
/// complete(cache.getOrSet(key, 27, 1, false)); /// Get [27, 27]
complete(cache.getOrSet(key, 17, 4, {})); /// Get [17, 20]
complete(cache.getOrSet(key, 24, 3, {})); /// Get [24, 26]
/// completeWithState(cache.getOrSet(key, 27, 1, false)); /// Get [27, 27]
/// Current cache: [__________][_____] [____] [___][]
/// ^ ^^ ^ ^ ^ ^ ^^^
@ -191,7 +192,7 @@ TEST(FileCache, get)
ASSERT_EQ(cache.getUsedCacheSize(), 22);
{
auto holder = cache.getOrSet(key, 0, 26, false); /// Get [0, 25]
auto holder = cache.getOrSet(key, 0, 26, {}); /// Get [0, 25]
auto segments = fromHolder(holder);
ASSERT_EQ(segments.size(), 6);
@ -225,14 +226,14 @@ TEST(FileCache, get)
/// as max elements size is reached, next attempt to put something in cache should fail.
/// This will also check that [27, 27] was indeed evicted.
auto holder1 = cache.getOrSet(key, 27, 1, false);
auto holder1 = cache.getOrSet(key, 27, 1, {});
auto segments_1 = fromHolder(holder1); /// Get [27, 27]
ASSERT_EQ(segments_1.size(), 1);
assertRange(17, segments_1[0], DB::FileSegment::Range(27, 27), DB::FileSegment::State::EMPTY);
}
{
auto holder = cache.getOrSet(key, 12, 10, false); /// Get [12, 21]
auto holder = cache.getOrSet(key, 12, 10, {}); /// Get [12, 21]
auto segments = fromHolder(holder);
ASSERT_EQ(segments.size(), 4);
@ -256,7 +257,7 @@ TEST(FileCache, get)
ASSERT_EQ(cache.getFileSegmentsNum(), 5);
{
auto holder = cache.getOrSet(key, 23, 5, false); /// Get [23, 28]
auto holder = cache.getOrSet(key, 23, 5, {}); /// Get [23, 28]
auto segments = fromHolder(holder);
ASSERT_EQ(segments.size(), 3);
@ -277,12 +278,12 @@ TEST(FileCache, get)
/// 17 21 2324 26 28
{
auto holder5 = cache.getOrSet(key, 2, 3,false); /// Get [2, 4]
auto holder5 = cache.getOrSet(key, 2, 3, {}); /// Get [2, 4]
auto s5 = fromHolder(holder5);
ASSERT_EQ(s5.size(), 1);
assertRange(25, s5[0], DB::FileSegment::Range(2, 4), DB::FileSegment::State::EMPTY);
auto holder1 = cache.getOrSet(key, 30, 2, false); /// Get [30, 31]
auto holder1 = cache.getOrSet(key, 30, 2, {}); /// Get [30, 31]
auto s1 = fromHolder(holder1);
ASSERT_EQ(s1.size(), 1);
assertRange(26, s1[0], DB::FileSegment::Range(30, 31), DB::FileSegment::State::EMPTY);
@ -298,20 +299,20 @@ TEST(FileCache, get)
/// ^ ^ ^ ^ ^ ^ ^ ^
/// 2 4 23 24 26 27 30 31
auto holder2 = cache.getOrSet(key, 23, 1, false); /// Get [23, 23]
auto holder2 = cache.getOrSet(key, 23, 1, {}); /// Get [23, 23]
auto s2 = fromHolder(holder2);
ASSERT_EQ(s2.size(), 1);
auto holder3 = cache.getOrSet(key, 24, 3, false); /// Get [24, 26]
auto holder3 = cache.getOrSet(key, 24, 3, {}); /// Get [24, 26]
auto s3 = fromHolder(holder3);
ASSERT_EQ(s3.size(), 1);
auto holder4 = cache.getOrSet(key, 27, 1, false); /// Get [27, 27]
auto holder4 = cache.getOrSet(key, 27, 1, {}); /// Get [27, 27]
auto s4 = fromHolder(holder4);
ASSERT_EQ(s4.size(), 1);
/// All cache is now unreleasable because pointers are still hold
auto holder6 = cache.getOrSet(key, 0, 40, false);
auto holder6 = cache.getOrSet(key, 0, 40, {});
auto f = fromHolder(holder6);
ASSERT_EQ(f.size(), 9);
@ -332,7 +333,7 @@ TEST(FileCache, get)
}
{
auto holder = cache.getOrSet(key, 2, 3, false); /// Get [2, 4]
auto holder = cache.getOrSet(key, 2, 3, {}); /// Get [2, 4]
auto segments = fromHolder(holder);
ASSERT_EQ(segments.size(), 1);
assertRange(31, segments[0], DB::FileSegment::Range(2, 4), DB::FileSegment::State::DOWNLOADED);
@ -343,7 +344,7 @@ TEST(FileCache, get)
/// 2 4 23 24 26 27 30 31
{
auto holder = cache.getOrSet(key, 25, 5, false); /// Get [25, 29]
auto holder = cache.getOrSet(key, 25, 5, {}); /// Get [25, 29]
auto segments = fromHolder(holder);
ASSERT_EQ(segments.size(), 3);
@ -367,7 +368,7 @@ TEST(FileCache, get)
DB::CurrentThread::QueryScope query_scope_holder_1(query_context_1);
thread_status_1.attachQueryContext(query_context_1);
auto holder_2 = cache.getOrSet(key, 25, 5, false); /// Get [25, 29] once again.
auto holder_2 = cache.getOrSet(key, 25, 5, {}); /// Get [25, 29] once again.
auto segments_2 = fromHolder(holder_2);
ASSERT_EQ(segments.size(), 3);
@ -406,11 +407,11 @@ TEST(FileCache, get)
{
/// Now let's check the similar case but getting ERROR state after segment->wait(), when
/// state is changed not manually via segment->complete(state) but from destructor of holder
/// state is changed not manually via segment->completeWithState(state) but from destructor of holder
/// and notify_all() is also called from destructor of holder.
std::optional<DB::FileSegmentsHolder> holder;
holder.emplace(cache.getOrSet(key, 3, 23, false)); /// Get [3, 25]
holder.emplace(cache.getOrSet(key, 3, 23, {})); /// Get [3, 25]
auto segments = fromHolder(*holder);
ASSERT_EQ(segments.size(), 3);
@ -436,7 +437,7 @@ TEST(FileCache, get)
DB::CurrentThread::QueryScope query_scope_holder_1(query_context_1);
thread_status_1.attachQueryContext(query_context_1);
auto holder_2 = cache.getOrSet(key, 3, 23, false); /// Get [3, 25] once again
auto holder_2 = cache.getOrSet(key, 3, 23, {}); /// Get [3, 25] once again
auto segments_2 = fromHolder(*holder);
ASSERT_EQ(segments_2.size(), 3);
@ -485,7 +486,7 @@ TEST(FileCache, get)
cache2.initialize();
auto key = cache2.hash("key1");
auto holder1 = cache2.getOrSet(key, 2, 28, false); /// Get [2, 29]
auto holder1 = cache2.getOrSet(key, 2, 28, {}); /// Get [2, 29]
auto segments1 = fromHolder(holder1);
ASSERT_EQ(segments1.size(), 5);
@ -506,7 +507,7 @@ TEST(FileCache, get)
cache2.initialize();
auto key = cache2.hash("key1");
auto holder1 = cache2.getOrSet(key, 0, 25, false); /// Get [0, 24]
auto holder1 = cache2.getOrSet(key, 0, 25, {}); /// Get [0, 24]
auto segments1 = fromHolder(holder1);
ASSERT_EQ(segments1.size(), 3);