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Merge pull request #41437 from kssenii/fix-logical-error-write-through-cache
Fix assertion in write-through cache
This commit is contained in:
commit
3c7bbad0b0
@ -11,12 +11,16 @@ namespace ProfileEvents
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{
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extern const Event CachedWriteBufferCacheWriteBytes;
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extern const Event CachedWriteBufferCacheWriteMicroseconds;
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extern const Event FileSegmentWriteMicroseconds;
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}
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namespace DB
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{
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namespace ErrorCodes
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{
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extern const int LOGICAL_ERROR;
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}
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namespace
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{
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class SwapHelper
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@ -31,6 +35,178 @@ namespace
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};
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}
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FileSegmentRangeWriter::FileSegmentRangeWriter(
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FileCache * cache_,
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const FileSegment::Key & key_,
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std::shared_ptr<FilesystemCacheLog> cache_log_,
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const String & query_id_,
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const String & source_path_)
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: cache(cache_)
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, key(key_)
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, cache_log(cache_log_)
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, query_id(query_id_)
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, source_path(source_path_)
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, current_file_segment_it(file_segments_holder.file_segments.end())
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{
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}
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bool FileSegmentRangeWriter::write(const char * data, size_t size, size_t offset, bool is_persistent)
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{
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if (finalized)
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return false;
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auto & file_segments = file_segments_holder.file_segments;
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if (current_file_segment_it == file_segments.end())
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{
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current_file_segment_it = allocateFileSegment(current_file_segment_write_offset, is_persistent);
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}
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else
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{
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auto file_segment = *current_file_segment_it;
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assert(file_segment->getCurrentWriteOffset() == current_file_segment_write_offset);
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if (current_file_segment_write_offset != offset)
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{
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throw Exception(
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ErrorCodes::LOGICAL_ERROR,
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"Cannot write file segment at offset {}, because current write offset is: {}",
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offset, current_file_segment_write_offset);
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}
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if (file_segment->range().size() == file_segment->getDownloadedSize())
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{
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completeFileSegment(*file_segment);
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current_file_segment_it = allocateFileSegment(current_file_segment_write_offset, is_persistent);
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}
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}
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auto & file_segment = *current_file_segment_it;
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auto downloader = file_segment->getOrSetDownloader();
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if (downloader != FileSegment::getCallerId())
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throw Exception(ErrorCodes::LOGICAL_ERROR, "Failed to set a downloader. ({})", file_segment->getInfoForLog());
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SCOPE_EXIT({
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if (file_segment->isDownloader())
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file_segment->completePartAndResetDownloader();
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});
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bool reserved = file_segment->reserve(size);
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if (!reserved)
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{
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file_segment->completeWithState(FileSegment::State::PARTIALLY_DOWNLOADED_NO_CONTINUATION);
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appendFilesystemCacheLog(*file_segment);
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LOG_DEBUG(
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&Poco::Logger::get("FileSegmentRangeWriter"),
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"Unsuccessful space reservation attempt (size: {}, file segment info: {}",
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size, file_segment->getInfoForLog());
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return false;
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}
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try
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{
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file_segment->write(data, size, offset);
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}
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catch (...)
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{
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file_segment->completePartAndResetDownloader();
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throw;
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}
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file_segment->completePartAndResetDownloader();
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current_file_segment_write_offset += size;
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return true;
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}
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void FileSegmentRangeWriter::finalize()
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{
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if (finalized)
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return;
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auto & file_segments = file_segments_holder.file_segments;
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if (file_segments.empty() || current_file_segment_it == file_segments.end())
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return;
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completeFileSegment(**current_file_segment_it);
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finalized = true;
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}
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FileSegmentRangeWriter::~FileSegmentRangeWriter()
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{
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try
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{
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if (!finalized)
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finalize();
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}
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catch (...)
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{
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tryLogCurrentException(__PRETTY_FUNCTION__);
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}
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}
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FileSegments::iterator FileSegmentRangeWriter::allocateFileSegment(size_t offset, bool is_persistent)
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{
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/**
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* Allocate a new file segment starting `offset`.
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* File segment capacity will equal `max_file_segment_size`, but actual size is 0.
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*/
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std::lock_guard cache_lock(cache->mutex);
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CreateFileSegmentSettings create_settings
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{
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.is_persistent = is_persistent,
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};
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/// We set max_file_segment_size to be downloaded,
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/// if we have less size to write, file segment will be resized in complete() method.
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auto file_segment = cache->createFileSegmentForDownload(
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key, offset, cache->max_file_segment_size, create_settings, cache_lock);
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return file_segments_holder.add(std::move(file_segment));
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}
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void FileSegmentRangeWriter::appendFilesystemCacheLog(const FileSegment & file_segment)
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{
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if (cache_log)
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{
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auto file_segment_range = file_segment.range();
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size_t file_segment_right_bound = file_segment_range.left + file_segment.getDownloadedSize() - 1;
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FilesystemCacheLogElement elem
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{
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.event_time = std::chrono::system_clock::to_time_t(std::chrono::system_clock::now()),
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.query_id = query_id,
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.source_file_path = source_path,
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.file_segment_range = { file_segment_range.left, file_segment_right_bound },
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.requested_range = {},
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.cache_type = FilesystemCacheLogElement::CacheType::WRITE_THROUGH_CACHE,
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.file_segment_size = file_segment_range.size(),
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.read_from_cache_attempted = false,
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.read_buffer_id = {},
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.profile_counters = nullptr,
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};
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cache_log->add(elem);
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}
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}
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void FileSegmentRangeWriter::completeFileSegment(FileSegment & file_segment)
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{
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/// File segment can be detached if space reservation failed.
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if (file_segment.isDetached())
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return;
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file_segment.completeWithoutState();
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appendFilesystemCacheLog(file_segment);
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}
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CachedOnDiskWriteBufferFromFile::CachedOnDiskWriteBufferFromFile(
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std::unique_ptr<WriteBuffer> impl_,
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FileCachePtr cache_,
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@ -47,7 +223,6 @@ CachedOnDiskWriteBufferFromFile::CachedOnDiskWriteBufferFromFile(
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, is_persistent_cache_file(is_persistent_cache_file_)
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, query_id(query_id_)
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, enable_cache_log(!query_id_.empty() && settings_.enable_filesystem_cache_log)
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, cache_log(Context::getGlobalContextInstance()->getFilesystemCacheLog())
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{
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}
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@ -82,8 +257,11 @@ void CachedOnDiskWriteBufferFromFile::cacheData(char * data, size_t size)
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if (!cache_writer)
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{
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cache_writer = std::make_unique<FileSegmentRangeWriter>(
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cache.get(), key, [this](const FileSegment & file_segment) { appendFilesystemCacheLog(file_segment); });
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std::shared_ptr<FilesystemCacheLog> cache_log;
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if (enable_cache_log)
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cache_log = Context::getGlobalContextInstance()->getFilesystemCacheLog();
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cache_writer = std::make_unique<FileSegmentRangeWriter>(cache.get(), key, cache_log, query_id, source_path);
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}
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Stopwatch watch(CLOCK_MONOTONIC);
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@ -119,37 +297,9 @@ void CachedOnDiskWriteBufferFromFile::cacheData(char * data, size_t size)
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ProfileEvents::increment(ProfileEvents::CachedWriteBufferCacheWriteBytes, size);
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ProfileEvents::increment(ProfileEvents::CachedWriteBufferCacheWriteMicroseconds, watch.elapsedMicroseconds());
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current_file_segment_counters.increment(
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ProfileEvents::FileSegmentWriteMicroseconds, watch.elapsedMicroseconds());
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cache_in_error_state_or_disabled = false;
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}
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void CachedOnDiskWriteBufferFromFile::appendFilesystemCacheLog(const FileSegment & file_segment)
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{
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if (cache_log)
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{
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auto file_segment_range = file_segment.range();
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FilesystemCacheLogElement elem
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{
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.event_time = std::chrono::system_clock::to_time_t(std::chrono::system_clock::now()),
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.query_id = query_id,
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.source_file_path = source_path,
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.file_segment_range = { file_segment_range.left, file_segment_range.right },
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.requested_range = {},
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.cache_type = FilesystemCacheLogElement::CacheType::WRITE_THROUGH_CACHE,
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.file_segment_size = file_segment_range.size(),
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.read_from_cache_attempted = false,
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.read_buffer_id = {},
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.profile_counters = std::make_shared<ProfileEvents::Counters::Snapshot>(current_file_segment_counters.getPartiallyAtomicSnapshot()),
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};
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current_file_segment_counters.reset();
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cache_log->add(elem);
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}
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}
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void CachedOnDiskWriteBufferFromFile::finalizeImpl()
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{
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try
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@ -13,11 +13,57 @@ class Logger;
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namespace DB
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{
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/**
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* We want to write eventually some size, which is not known until the very end.
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* Therefore we allocate file segments lazily. Each file segment is assigned capacity
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* of max_file_segment_size, but reserved_size remains 0, until call to tryReserve().
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* Once current file segment is full (reached max_file_segment_size), we allocate a
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* new file segment. All allocated file segments resize in file segments holder.
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* If at the end of all writes, the last file segment is not full, then it is resized.
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*/
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class FileSegmentRangeWriter
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{
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public:
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FileSegmentRangeWriter(
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FileCache * cache_, const FileSegment::Key & key_,
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std::shared_ptr<FilesystemCacheLog> cache_log_, const String & query_id_, const String & source_path_);
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/**
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* Write a range of file segments. Allocate file segment of `max_file_segment_size` and write to
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* it until it is full and then allocate next file segment.
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*/
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bool write(const char * data, size_t size, size_t offset, bool is_persistent);
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void finalize();
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~FileSegmentRangeWriter();
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private:
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FileSegments::iterator allocateFileSegment(size_t offset, bool is_persistent);
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void appendFilesystemCacheLog(const FileSegment & file_segment);
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void completeFileSegment(FileSegment & file_segment);
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FileCache * cache;
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FileSegment::Key key;
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std::shared_ptr<FilesystemCacheLog> cache_log;
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String query_id;
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String source_path;
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FileSegmentsHolder file_segments_holder{};
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FileSegments::iterator current_file_segment_it;
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size_t current_file_segment_write_offset = 0;
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bool finalized = false;
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};
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/**
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* Write buffer for filesystem caching on write operations.
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*/
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class FileSegmentRangeWriter;
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class CachedOnDiskWriteBufferFromFile final : public WriteBufferFromFileDecorator
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{
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public:
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@ -36,7 +82,6 @@ public:
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private:
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void cacheData(char * data, size_t size);
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void appendFilesystemCacheLog(const FileSegment & file_segment);
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Poco::Logger * log;
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@ -49,11 +94,9 @@ private:
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const String query_id;
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bool enable_cache_log;
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std::shared_ptr<FilesystemCacheLog> cache_log;
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bool cache_in_error_state_or_disabled = false;
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ProfileEvents::Counters current_file_segment_counters;
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std::unique_ptr<FileSegmentRangeWriter> cache_writer;
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};
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@ -125,12 +125,6 @@ size_t FileSegment::getDownloadedSizeUnlocked(std::unique_lock<std::mutex> & /*
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return downloaded_size;
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}
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size_t FileSegment::getRemainingSizeToDownload() const
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{
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std::unique_lock segment_lock(mutex);
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return range().size() - getDownloadedSizeUnlocked(segment_lock);
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}
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bool FileSegment::isDownloaded() const
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{
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std::lock_guard segment_lock(mutex);
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@ -836,186 +830,4 @@ String FileSegmentsHolder::toString()
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return ranges;
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}
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FileSegmentRangeWriter::FileSegmentRangeWriter(
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FileCache * cache_,
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const FileSegment::Key & key_,
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OnCompleteFileSegmentCallback && on_complete_file_segment_func_)
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: cache(cache_)
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, key(key_)
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, current_file_segment_it(file_segments_holder.file_segments.end())
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, on_complete_file_segment_func(on_complete_file_segment_func_)
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{
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}
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FileSegments::iterator FileSegmentRangeWriter::allocateFileSegment(size_t offset, bool is_persistent)
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{
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/**
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* Allocate a new file segment starting `offset`.
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* File segment capacity will equal `max_file_segment_size`, but actual size is 0.
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*/
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std::lock_guard cache_lock(cache->mutex);
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CreateFileSegmentSettings create_settings
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{
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.is_persistent = is_persistent,
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};
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/// We set max_file_segment_size to be downloaded,
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/// if we have less size to write, file segment will be resized in complete() method.
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auto file_segment = cache->createFileSegmentForDownload(
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key, offset, cache->max_file_segment_size, create_settings, cache_lock);
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return file_segments_holder.add(std::move(file_segment));
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}
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void FileSegmentRangeWriter::completeFileSegment(FileSegment & file_segment)
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{
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/**
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* Complete file segment based on downaloaded size.
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*/
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/// File segment can be detached if space reservation failed.
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if (file_segment.isDetached())
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return;
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size_t current_downloaded_size = file_segment.getDownloadedSize();
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/// file_segment->complete(DOWNLOADED) is not enough, because file segment capacity
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/// was initially set with a margin as `max_file_segment_size`. => We need to always
|
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/// resize to actual size after download finished.
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if (current_downloaded_size != file_segment.range().size())
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{
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/// Current file segment is downloaded as a part of write-through cache
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/// and therefore cannot be concurrently accessed. Nevertheless, it can be
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/// accessed by cache system tables if someone read from them,
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/// therefore we need a mutex.
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std::unique_lock segment_lock(file_segment.mutex);
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assert(current_downloaded_size <= file_segment.range().size());
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file_segment.segment_range = FileSegment::Range(
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file_segment.segment_range.left,
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file_segment.segment_range.left + current_downloaded_size - 1);
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file_segment.reserved_size = current_downloaded_size;
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file_segment.setDownloadedUnlocked(segment_lock);
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}
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file_segment.completeWithoutState();
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on_complete_file_segment_func(file_segment);
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}
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|
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bool FileSegmentRangeWriter::write(const char * data, size_t size, size_t offset, bool is_persistent)
|
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{
|
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/**
|
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* Write a range of file segments. Allocate file segment of `max_file_segment_size` and write to
|
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* it until it is full and then allocate next file segment.
|
||||
*/
|
||||
|
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if (finalized)
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return false;
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|
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auto & file_segments = file_segments_holder.file_segments;
|
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|
||||
if (current_file_segment_it == file_segments.end())
|
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{
|
||||
current_file_segment_it = allocateFileSegment(current_file_segment_write_offset, is_persistent);
|
||||
}
|
||||
else
|
||||
{
|
||||
if (current_file_segment_write_offset != offset)
|
||||
{
|
||||
throw Exception(
|
||||
ErrorCodes::LOGICAL_ERROR,
|
||||
"Cannot write file segment at offset {}, because current write offset is: {}",
|
||||
offset, current_file_segment_write_offset);
|
||||
}
|
||||
|
||||
size_t current_write_offset = (*current_file_segment_it)->getCurrentWriteOffset();
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||||
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||||
auto current_file_segment = *current_file_segment_it;
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||||
if (current_file_segment->getRemainingSizeToDownload() == 0)
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{
|
||||
completeFileSegment(*current_file_segment);
|
||||
current_file_segment_it = allocateFileSegment(current_file_segment_write_offset, is_persistent);
|
||||
}
|
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else if (current_write_offset != offset)
|
||||
{
|
||||
throw Exception(
|
||||
ErrorCodes::LOGICAL_ERROR,
|
||||
"Cannot file segment download offset {} does not match current write offset {}",
|
||||
current_write_offset, offset);
|
||||
}
|
||||
}
|
||||
|
||||
auto & file_segment = *current_file_segment_it;
|
||||
|
||||
auto downloader = file_segment->getOrSetDownloader();
|
||||
if (downloader != FileSegment::getCallerId())
|
||||
throw Exception(ErrorCodes::LOGICAL_ERROR, "Failed to set a downloader. ({})", file_segment->getInfoForLog());
|
||||
|
||||
SCOPE_EXIT({
|
||||
if (file_segment->isDownloader())
|
||||
{
|
||||
file_segment->completePartAndResetDownloader();
|
||||
}
|
||||
});
|
||||
|
||||
bool reserved = file_segment->reserve(size);
|
||||
if (!reserved)
|
||||
{
|
||||
file_segment->completeWithState(FileSegment::State::PARTIALLY_DOWNLOADED_NO_CONTINUATION);
|
||||
on_complete_file_segment_func(*file_segment);
|
||||
|
||||
LOG_DEBUG(
|
||||
&Poco::Logger::get("FileSegmentRangeWriter"),
|
||||
"Unsuccessful space reservation attempt (size: {}, file segment info: {}",
|
||||
size, file_segment->getInfoForLog());
|
||||
|
||||
return false;
|
||||
}
|
||||
|
||||
try
|
||||
{
|
||||
file_segment->write(data, size, offset);
|
||||
}
|
||||
catch (...)
|
||||
{
|
||||
file_segment->completePartAndResetDownloader();
|
||||
throw;
|
||||
}
|
||||
|
||||
file_segment->completePartAndResetDownloader();
|
||||
current_file_segment_write_offset += size;
|
||||
|
||||
return true;
|
||||
}
|
||||
|
||||
void FileSegmentRangeWriter::finalize()
|
||||
{
|
||||
if (finalized)
|
||||
return;
|
||||
|
||||
auto & file_segments = file_segments_holder.file_segments;
|
||||
if (file_segments.empty() || current_file_segment_it == file_segments.end())
|
||||
return;
|
||||
|
||||
completeFileSegment(**current_file_segment_it);
|
||||
finalized = true;
|
||||
}
|
||||
|
||||
FileSegmentRangeWriter::~FileSegmentRangeWriter()
|
||||
{
|
||||
try
|
||||
{
|
||||
if (!finalized)
|
||||
finalize();
|
||||
}
|
||||
catch (...)
|
||||
{
|
||||
tryLogCurrentException(__PRETTY_FUNCTION__);
|
||||
}
|
||||
}
|
||||
|
||||
}
|
||||
|
@ -217,8 +217,6 @@ public:
|
||||
|
||||
void resetRemoteFileReader();
|
||||
|
||||
size_t getRemainingSizeToDownload() const;
|
||||
|
||||
private:
|
||||
size_t getFirstNonDownloadedOffsetUnlocked(std::unique_lock<std::mutex> & segment_lock) const;
|
||||
size_t getCurrentWriteOffsetUnlocked(std::unique_lock<std::mutex> & segment_lock) const;
|
||||
@ -327,47 +325,4 @@ struct FileSegmentsHolder : private boost::noncopyable
|
||||
FileSegments file_segments{};
|
||||
};
|
||||
|
||||
/**
|
||||
* We want to write eventually some size, which is not known until the very end.
|
||||
* Therefore we allocate file segments lazily. Each file segment is assigned capacity
|
||||
* of max_file_segment_size, but reserved_size remains 0, until call to tryReserve().
|
||||
* Once current file segment is full (reached max_file_segment_size), we allocate a
|
||||
* new file segment. All allocated file segments resize in file segments holder.
|
||||
* If at the end of all writes, the last file segment is not full, then it is resized.
|
||||
*/
|
||||
class FileSegmentRangeWriter
|
||||
{
|
||||
public:
|
||||
using OnCompleteFileSegmentCallback = std::function<void(const FileSegment & file_segment)>;
|
||||
|
||||
FileSegmentRangeWriter(
|
||||
FileCache * cache_,
|
||||
const FileSegment::Key & key_,
|
||||
/// A callback which is called right after each file segment is completed.
|
||||
/// It is used to write into filesystem cache log.
|
||||
OnCompleteFileSegmentCallback && on_complete_file_segment_func_);
|
||||
|
||||
~FileSegmentRangeWriter();
|
||||
|
||||
bool write(const char * data, size_t size, size_t offset, bool is_persistent);
|
||||
|
||||
void finalize();
|
||||
|
||||
private:
|
||||
FileSegments::iterator allocateFileSegment(size_t offset, bool is_persistent);
|
||||
void completeFileSegment(FileSegment & file_segment);
|
||||
|
||||
FileCache * cache;
|
||||
FileSegment::Key key;
|
||||
|
||||
FileSegmentsHolder file_segments_holder;
|
||||
FileSegments::iterator current_file_segment_it;
|
||||
|
||||
size_t current_file_segment_write_offset = 0;
|
||||
|
||||
bool finalized = false;
|
||||
|
||||
OnCompleteFileSegmentCallback on_complete_file_segment_func;
|
||||
};
|
||||
|
||||
}
|
||||
|
Loading…
Reference in New Issue
Block a user