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ClickHouse/src/Common/tests/gtest_lru_file_cache.cpp
kssenii 1858f69f5a Make space reservation incremental
2022-01-21 18:39:34 +03:00

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#include <iomanip>
#include <iostream>
#include <gtest/gtest.h>
#include <Common/FileCache.h>
#include <Common/CurrentThread.h>
#include <Common/filesystemHelpers.h>
#include <Common/SipHash.h>
#include <Common/hex.h>
#include <Interpreters/Context.h>
#include <IO/ReadHelpers.h>
#include <IO/WriteHelpers.h>
#include <filesystem>
#include <thread>
namespace fs = std::filesystem;
String cache_base_path = fs::current_path() / "test_lru_file_cache" / "";
void assertRange(
size_t assert_n, DB::FileSegmentPtr file_segment,
const DB::FileSegment::Range & expected_range, DB::FileSegment::State expected_state)
{
auto range = file_segment->range();
std::cerr << fmt::format("\nAssert #{} : {} == {} (state: {} == {})\n", assert_n,
range.toString(), expected_range.toString(),
toString(file_segment->state()), toString(expected_state));
ASSERT_EQ(range.left, expected_range.left);
ASSERT_EQ(range.right, expected_range.right);
ASSERT_EQ(file_segment->state(), expected_state);
};
void printRanges(const auto & segments)
{
std::cerr << "\nHaving file segments: ";
for (const auto & segment : segments)
std::cerr << '\n' << segment->range().toString() << "\n";
}
std::vector<DB::FileSegmentPtr> fromHolder(const DB::FileSegmentsHolder & holder)
{
return std::vector<DB::FileSegmentPtr>(holder.file_segments.begin(), holder.file_segments.end());
}
String keyToStr(const DB::FileCache::Key & key)
{
return getHexUIntLowercase(key);
}
String getFileSegmentPath(const String & base_path, const DB::FileCache::Key & key, size_t offset)
{
auto key_str = keyToStr(key);
return fs::path(base_path) / key_str.substr(0, 3) / key_str / DB::toString(offset);
}
void download(DB::FileSegmentPtr file_segment)
{
const auto & key = file_segment->key();
size_t size = file_segment->range().size();
auto key_str = keyToStr(key);
auto subdir = fs::path(cache_base_path) / key_str.substr(0, 3) / key_str;
if (!fs::exists(subdir))
fs::create_directories(subdir);
std::string data(size, '0');
file_segment->write(data.data(), size);
}
void prepareAndDownload(DB::FileSegmentPtr file_segment)
{
ASSERT_TRUE(file_segment->getOrSetDownloader() == DB::FileSegment::getCallerId());
std::cerr << "Reserving: " << file_segment->range().size() << " for: " << file_segment->range().toString() << "\n";
ASSERT_TRUE(file_segment->reserve(file_segment->range().size()));
download(file_segment);
}
void complete(const DB::FileSegmentsHolder & holder)
{
for (const auto & file_segment : holder.file_segments)
{
prepareAndDownload(file_segment);
file_segment->complete();
}
}
TEST(LRUFileCache, get)
{
if (fs::exists(cache_base_path))
fs::remove_all(cache_base_path);
fs::create_directory(cache_base_path);
DB::ThreadStatus thread_status;
/// To work with cache need query_id and query context.
auto shared_context = DB::Context::createShared();
auto context = DB::Context::createGlobal(shared_context.get());
context->makeGlobalContext();
auto query_context = DB::Context::createCopy(context);
query_context->makeQueryContext();
query_context->setCurrentQueryId("query_id");
DB::CurrentThread::QueryScope query_scope_holder(query_context);
auto cache = DB::LRUFileCache(cache_base_path, 30, 5);
auto key = cache.hash("key1");
{
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);
assertRange(1, segments[0], DB::FileSegment::Range(0, 9), DB::FileSegment::State::EMPTY);
/// Exception because space not reserved.
EXPECT_THROW(download(segments[0]), DB::Exception);
/// Exception because space can be reserved only by downloader
EXPECT_THROW(segments[0]->reserve(segments[0]->range().size()), DB::Exception);
ASSERT_TRUE(segments[0]->getOrSetDownloader() == DB::FileSegment::getCallerId());
ASSERT_TRUE(segments[0]->reserve(segments[0]->range().size()));
assertRange(2, segments[0], DB::FileSegment::Range(0, 9), DB::FileSegment::State::DOWNLOADING);
download(segments[0]);
segments[0]->complete();
assertRange(3, segments[0], DB::FileSegment::Range(0, 9), DB::FileSegment::State::DOWNLOADED);
}
/// Current cache: [__________]
/// ^ ^
/// 0 9
{
/// 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);
auto segments = fromHolder(holder);
ASSERT_EQ(segments.size(), 2);
assertRange(4, segments[0], DB::FileSegment::Range(0, 9), DB::FileSegment::State::DOWNLOADED);
assertRange(5, segments[1], DB::FileSegment::Range(10, 14), DB::FileSegment::State::EMPTY);
prepareAndDownload(segments[1]);
segments[1]->complete();
assertRange(6, segments[1], DB::FileSegment::Range(10, 14), DB::FileSegment::State::DOWNLOADED);
}
/// Current cache: [__________][_____]
/// ^ ^^ ^
/// 0 910 14
{
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); /// 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);
assertRange(9, segments[1], DB::FileSegment::Range(10, 14), DB::FileSegment::State::DOWNLOADED);
}
{
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)); /// Get [17, 20]
complete(cache.getOrSet(key, 24, 3)); /// Get [24, 26]
complete(cache.getOrSet(key, 27, 1)); /// Get [27, 27]
/// Current cache: [__________][_____] [____] [___][]
/// ^ ^^ ^ ^ ^ ^ ^^^
/// 0 910 14 17 20 24 2627
///
{
auto holder = cache.getOrSet(key, 0, 26); /// Get [0, 25]
auto segments = fromHolder(holder);
ASSERT_EQ(segments.size(), 6);
assertRange(11, segments[0], DB::FileSegment::Range(0, 9), DB::FileSegment::State::DOWNLOADED);
assertRange(12, segments[1], DB::FileSegment::Range(10, 14), DB::FileSegment::State::DOWNLOADED);
/// Missing [15, 16] should be added in cache.
assertRange(13, segments[2], DB::FileSegment::Range(15, 16), DB::FileSegment::State::EMPTY);
prepareAndDownload(segments[2]);
segments[2]->complete();
assertRange(14, segments[3], DB::FileSegment::Range(17, 20), DB::FileSegment::State::DOWNLOADED);
/// New [21, 23], but will not be added in cache because of elements limit (5)
assertRange(15, segments[4], DB::FileSegment::Range(21, 23), DB::FileSegment::State::EMPTY);
ASSERT_TRUE(segments[4]->getOrSetDownloader() == DB::FileSegment::getCallerId());
ASSERT_FALSE(segments[4]->reserve(1));
assertRange(16, segments[5], DB::FileSegment::Range(24, 26), DB::FileSegment::State::DOWNLOADED);
/// Current cache: [__________][_____][ ][____] [___]
/// ^ ^ ^
/// 0 20 24
///
/// Range [27, 27] must be evicted in previous getOrSet [0, 25].
/// Let's not invalidate pointers to returned segments from range [0, 25] and
/// 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);
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); /// Get [12, 21]
auto segments = fromHolder(holder);
ASSERT_EQ(segments.size(), 4);
assertRange(18, segments[0], DB::FileSegment::Range(10, 14), DB::FileSegment::State::DOWNLOADED);
assertRange(19, segments[1], DB::FileSegment::Range(15, 16), DB::FileSegment::State::DOWNLOADED);
assertRange(20, segments[2], DB::FileSegment::Range(17, 20), DB::FileSegment::State::DOWNLOADED);
assertRange(21, segments[3], DB::FileSegment::Range(21, 21), DB::FileSegment::State::EMPTY);
prepareAndDownload(segments[3]);
segments[3]->complete();
ASSERT_TRUE(segments[3]->state() == DB::FileSegment::State::DOWNLOADED);
}
/// Current cache: [_____][__][____][_] [___]
/// ^ ^ ^ ^ ^
/// 10 17 21 24 26
ASSERT_EQ(cache.getStat().size, 5);
{
auto holder = cache.getOrSet(key, 23, 5); /// Get [23, 28]
auto segments = fromHolder(holder);
ASSERT_EQ(segments.size(), 3);
assertRange(22, segments[0], DB::FileSegment::Range(23, 23), DB::FileSegment::State::EMPTY);
assertRange(23, segments[1], DB::FileSegment::Range(24, 26), DB::FileSegment::State::DOWNLOADED);
assertRange(24, segments[2], DB::FileSegment::Range(27, 27), DB::FileSegment::State::EMPTY);
prepareAndDownload(segments[0]);
prepareAndDownload(segments[2]);
segments[0]->complete();
segments[2]->complete();
}
/// Current cache: [____][_] [][___][__]
/// ^ ^ ^^^ ^^ ^
/// 17 21 2324 26 28
{
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); /// 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);
ASSERT_TRUE(s1[0]->getOrSetDownloader() == DB::FileSegment::getCallerId());
prepareAndDownload(s5[0]);
prepareAndDownload(s1[0]);
s5[0]->complete();
s1[0]->complete();
/// Current cache: [___] [_][___][_] [__]
/// ^ ^ ^ ^ ^ ^ ^ ^
/// 2 4 23 24 26 27 30 31
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); /// Get [24, 26]
auto s3 = fromHolder(holder3);
ASSERT_EQ(s3.size(), 1);
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 stil hold
auto holder6 = cache.getOrSet(key, 0, 40);
auto f = fromHolder(holder6);
ASSERT_EQ(f.size(), 9);
assertRange(27, f[0], DB::FileSegment::Range(0, 1), DB::FileSegment::State::EMPTY);
assertRange(28, f[2], DB::FileSegment::Range(5, 22), DB::FileSegment::State::EMPTY);
assertRange(29, f[6], DB::FileSegment::Range(28, 29), DB::FileSegment::State::EMPTY);
assertRange(30, f[8], DB::FileSegment::Range(32, 39), DB::FileSegment::State::EMPTY);
ASSERT_TRUE(f[0]->getOrSetDownloader() == DB::FileSegment::getCallerId());
ASSERT_TRUE(f[2]->getOrSetDownloader() == DB::FileSegment::getCallerId());
ASSERT_TRUE(f[6]->getOrSetDownloader() == DB::FileSegment::getCallerId());
ASSERT_TRUE(f[8]->getOrSetDownloader() == DB::FileSegment::getCallerId());
ASSERT_FALSE(f[0]->reserve(1));
ASSERT_FALSE(f[2]->reserve(1));
ASSERT_FALSE(f[6]->reserve(1));
ASSERT_FALSE(f[8]->reserve(1));
}
{
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);
}
/// Current cache: [___] [_][___][_] [__]
/// ^ ^ ^ ^ ^ ^ ^ ^
/// 2 4 23 24 26 27 30 31
{
auto holder = cache.getOrSet(key, 25, 5); /// Get [25, 29]
auto segments = fromHolder(holder);
ASSERT_EQ(segments.size(), 3);
assertRange(32, segments[0], DB::FileSegment::Range(24, 26), DB::FileSegment::State::DOWNLOADED);
assertRange(33, segments[1], DB::FileSegment::Range(27, 27), DB::FileSegment::State::DOWNLOADED);
assertRange(34, segments[2], DB::FileSegment::Range(28, 29), DB::FileSegment::State::EMPTY);
ASSERT_TRUE(segments[2]->getOrSetDownloader() == DB::FileSegment::getCallerId());
ASSERT_TRUE(segments[2]->state() == DB::FileSegment::State::DOWNLOADING);
bool lets_start_download = false;
std::mutex mutex;
std::condition_variable cv;
std::thread other_1([&]
{
DB::ThreadStatus thread_status_1;
auto query_context_1 = DB::Context::createCopy(context);
query_context_1->makeQueryContext();
query_context_1->setCurrentQueryId("query_id_1");
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); /// Get [25, 29] once again.
auto segments_2 = fromHolder(holder_2);
ASSERT_EQ(segments.size(), 3);
assertRange(35, segments_2[0], DB::FileSegment::Range(24, 26), DB::FileSegment::State::DOWNLOADED);
assertRange(36, segments_2[1], DB::FileSegment::Range(27, 27), DB::FileSegment::State::DOWNLOADED);
assertRange(37, segments_2[2], DB::FileSegment::Range(28, 29), DB::FileSegment::State::DOWNLOADING);
ASSERT_TRUE(segments[2]->getOrSetDownloader() != DB::FileSegment::getCallerId());
ASSERT_TRUE(segments[2]->state() == DB::FileSegment::State::DOWNLOADING);
{
std::lock_guard lock(mutex);
lets_start_download = true;
}
cv.notify_one();
segments_2[2]->wait();
ASSERT_TRUE(segments_2[2]->state() == DB::FileSegment::State::DOWNLOADED);
});
{
std::unique_lock lock(mutex);
cv.wait(lock, [&]{ return lets_start_download; });
}
prepareAndDownload(segments[2]);
segments[2]->complete();
ASSERT_TRUE(segments[2]->state() == DB::FileSegment::State::DOWNLOADED);
other_1.join();
}
/// Current cache: [___] [___][_][__][__]
/// ^ ^ ^ ^ ^^ ^^ ^
/// 2 4 24 26 27 2930 31
{
/// 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
/// and notify_all() is also called from destructor of holder.
auto holder = cache.getOrSet(key, 3, 23); /// Get [3, 25]
auto segments = fromHolder(holder);
ASSERT_EQ(segments.size(), 3);
assertRange(38, segments[0], DB::FileSegment::Range(2, 4), DB::FileSegment::State::DOWNLOADED);
assertRange(39, segments[1], DB::FileSegment::Range(5, 23), DB::FileSegment::State::EMPTY);
ASSERT_TRUE(segments[1]->getOrSetDownloader() == DB::FileSegment::getCallerId());
ASSERT_TRUE(segments[1]->state() == DB::FileSegment::State::DOWNLOADING);
assertRange(40, segments[2], DB::FileSegment::Range(24, 26), DB::FileSegment::State::DOWNLOADED);
bool lets_start_download = false;
std::mutex mutex;
std::condition_variable cv;
std::thread other_1([&]
{
DB::ThreadStatus thread_status_1;
auto query_context_1 = DB::Context::createCopy(context);
query_context_1->makeQueryContext();
query_context_1->setCurrentQueryId("query_id_1");
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); /// Get [3, 25] once again
auto segments_2 = fromHolder(holder);
ASSERT_EQ(segments_2.size(), 3);
assertRange(41, segments_2[0], DB::FileSegment::Range(2, 4), DB::FileSegment::State::DOWNLOADED);
assertRange(42, segments_2[1], DB::FileSegment::Range(5, 23), DB::FileSegment::State::DOWNLOADING);
assertRange(43, segments_2[2], DB::FileSegment::Range(24, 26), DB::FileSegment::State::DOWNLOADED);
ASSERT_TRUE(segments_2[1]->getOrSetDownloader() != DB::FileSegment::getCallerId());
ASSERT_TRUE(segments_2[1]->state() == DB::FileSegment::State::DOWNLOADING);
{
std::lock_guard lock(mutex);
lets_start_download = true;
}
cv.notify_one();
segments_2[1]->wait();
ASSERT_TRUE(segments_2[1]->state() == DB::FileSegment::State::DOWNLOADING);
ASSERT_TRUE(segments_2[1]->getOrSetDownloader() == DB::FileSegment::getCallerId());
prepareAndDownload(segments_2[1]);
});
{
std::unique_lock lock(mutex);
cv.wait(lock, [&]{ return lets_start_download; });
}
holder.~FileSegmentsHolder();
other_1.join();
ASSERT_TRUE(segments[1]->state() == DB::FileSegment::State::DOWNLOADED);
}
/// Current cache: [___][ ][___][_][__]
/// ^ ^^ ^ ^^ ^ ^
/// 2 45 24 2627 28 29
{
/// Test LRUCache::restore().
auto cache2 = DB::LRUFileCache(cache_base_path, 30, 5);
std::cerr << cache2.dump() << "\n";
ASSERT_EQ(cache2.getStat().downloaded_size, 5);
auto holder1 = cache2.getOrSet(key, 2, 28); /// Get [2, 29]
auto segments1 = fromHolder(holder1);
ASSERT_EQ(segments1.size(), 5);
assertRange(44, segments1[0], DB::FileSegment::Range(2, 4), DB::FileSegment::State::DOWNLOADED);
assertRange(45, segments1[1], DB::FileSegment::Range(5, 23), DB::FileSegment::State::DOWNLOADED);
assertRange(45, segments1[2], DB::FileSegment::Range(24, 26), DB::FileSegment::State::DOWNLOADED);
assertRange(46, segments1[3], DB::FileSegment::Range(27, 27), DB::FileSegment::State::DOWNLOADED);
assertRange(47, segments1[4], DB::FileSegment::Range(28, 29), DB::FileSegment::State::DOWNLOADED);
}
}
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