BlockBasedTableReader: automatically adjust tail prefetch size (#4156)
Summary: Right now we use one hard-coded prefetch size to prefetch data from the tail of the SST files. However, this may introduce a waste for some use cases, while not efficient for others. Introduce a way to adjust this prefetch size by tracking 32 recent times, and pick a value with which the wasted read is less than 10% Pull Request resolved: https://github.com/facebook/rocksdb/pull/4156 Differential Revision: D8916847 Pulled By: siying fbshipit-source-id: 8413f9eb3987e0033ed0bd910f83fc2eeaaf5758
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@ -2321,9 +2321,9 @@ TEST_F(DBTest2, RateLimitedCompactionReads) {
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options.rate_limiter->GetTotalBytesThrough(Env::IO_LOW);
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// Include the explicit prefetch of the footer in direct I/O case.
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size_t direct_io_extra = use_direct_io ? 512 * 1024 : 0;
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ASSERT_GE(rate_limited_bytes,
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static_cast<size_t>(kNumKeysPerFile * kBytesPerKey * kNumL0Files +
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direct_io_extra));
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ASSERT_GE(
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rate_limited_bytes,
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static_cast<size_t>(kNumKeysPerFile * kBytesPerKey * kNumL0Files));
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ASSERT_LT(
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rate_limited_bytes,
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static_cast<size_t>(2 * kNumKeysPerFile * kBytesPerKey * kNumL0Files +
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@ -2547,6 +2547,88 @@ TEST_F(DBTest2, PinnableSliceAndMmapReads) {
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#endif
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}
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TEST_F(DBTest2, TestBBTTailPrefetch) {
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std::atomic<bool> called(false);
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size_t expected_lower_bound = 512 * 1024;
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size_t expected_higher_bound = 512 * 1024;
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rocksdb::SyncPoint::GetInstance()->SetCallBack(
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"BlockBasedTable::Open::TailPrefetchLen", [&](void* arg) {
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size_t* prefetch_size = static_cast<size_t*>(arg);
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EXPECT_LE(expected_lower_bound, *prefetch_size);
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EXPECT_GE(expected_higher_bound, *prefetch_size);
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called = true;
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});
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rocksdb::SyncPoint::GetInstance()->EnableProcessing();
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Put("1", "1");
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Put("9", "1");
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Flush();
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expected_lower_bound = 0;
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expected_higher_bound = 8 * 1024;
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Put("1", "1");
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Put("9", "1");
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Flush();
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Put("1", "1");
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Put("9", "1");
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Flush();
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// Full compaction to make sure there is no L0 file after the open.
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ASSERT_OK(db_->CompactRange(CompactRangeOptions(), nullptr, nullptr));
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ASSERT_TRUE(called.load());
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called = false;
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rocksdb::SyncPoint::GetInstance()->DisableProcessing();
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rocksdb::SyncPoint::GetInstance()->ClearAllCallBacks();
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std::atomic<bool> first_call(true);
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rocksdb::SyncPoint::GetInstance()->SetCallBack(
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"BlockBasedTable::Open::TailPrefetchLen", [&](void* arg) {
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size_t* prefetch_size = static_cast<size_t*>(arg);
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if (first_call) {
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EXPECT_EQ(4 * 1024, *prefetch_size);
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first_call = false;
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} else {
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EXPECT_GE(4 * 1024, *prefetch_size);
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}
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called = true;
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});
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rocksdb::SyncPoint::GetInstance()->EnableProcessing();
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Options options = CurrentOptions();
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options.max_file_opening_threads = 1; // one thread
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BlockBasedTableOptions table_options;
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table_options.cache_index_and_filter_blocks = true;
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options.table_factory.reset(NewBlockBasedTableFactory(table_options));
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options.max_open_files = -1;
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Reopen(options);
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Put("1", "1");
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Put("9", "1");
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Flush();
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Put("1", "1");
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Put("9", "1");
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Flush();
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ASSERT_TRUE(called.load());
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called = false;
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// Parallel loading SST files
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options.max_file_opening_threads = 16;
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Reopen(options);
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ASSERT_OK(db_->CompactRange(CompactRangeOptions(), nullptr, nullptr));
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ASSERT_TRUE(called.load());
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rocksdb::SyncPoint::GetInstance()->DisableProcessing();
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rocksdb::SyncPoint::GetInstance()->ClearAllCallBacks();
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}
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} // namespace rocksdb
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int main(int argc, char** argv) {
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@ -27,10 +27,141 @@
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#include "table/block_based_table_builder.h"
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#include "table/block_based_table_reader.h"
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#include "table/format.h"
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#include "util/mutexlock.h"
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#include "util/string_util.h"
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namespace rocksdb {
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void TailPrefetchStats::RecordEffectiveSize(size_t len) {
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MutexLock l(&mutex_);
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if (num_records_ < kNumTracked) {
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num_records_++;
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}
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records_[next_++] = len;
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if (next_ == kNumTracked) {
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next_ = 0;
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}
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}
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size_t TailPrefetchStats::GetSuggestedPrefetchSize() {
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std::vector<size_t> sorted;
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{
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MutexLock l(&mutex_);
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if (num_records_ == 0) {
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return 0;
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}
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sorted.assign(records_, records_ + num_records_);
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}
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// Of the historic size, we find the maximum one that satisifis the condtiion
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// that if prefetching all, less than 1/8 will be wasted.
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std::sort(sorted.begin(), sorted.end());
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// Assuming we have 5 data points, and after sorting it looks like this:
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//
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// +---+
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// +---+ | |
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// | | | |
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// | | | |
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// | | | |
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// | | | |
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// +---+ | | | |
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// | | | | | |
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// +---+ | | | | | |
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// | | | | | | | |
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// +---+ | | | | | | | |
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// | | | | | | | | | |
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// | | | | | | | | | |
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// | | | | | | | | | |
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// | | | | | | | | | |
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// | | | | | | | | | |
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// +---+ +---+ +---+ +---+ +---+
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//
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// and we use every of the value as a candidate, and estimate how much we
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// wasted, compared to read. For example, when we use the 3rd record
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// as candiate. This area is what we read:
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// +---+
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// +---+ | |
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// | | | |
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// | | | |
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// | | | |
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// | | | |
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// *** *** *** ***+ *** *** *** *** **
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// * | | | | | |
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// +---+ | | | | | *
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// * | | | | | | | |
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// +---+ | | | | | | | *
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// * | | | | X | | | | |
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// | | | | | | | | | *
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// * | | | | | | | | |
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// | | | | | | | | | *
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// * | | | | | | | | |
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// *** *** ***-*** ***--*** ***--*** +****
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// which is (size of the record) X (number of records).
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//
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// While wasted is this area:
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// +---+
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// +---+ | |
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// | | | |
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// | | | |
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// | | | |
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// | | | |
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// *** *** *** ****---+ | | | |
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// * * | | | | |
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// * *-*** *** | | | | |
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// * * | | | | | | |
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// *--** *** | | | | | | |
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// | | | | | X | | | | |
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// | | | | | | | | | |
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// | | | | | | | | | |
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// | | | | | | | | | |
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// | | | | | | | | | |
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// +---+ +---+ +---+ +---+ +---+
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//
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// Which can be calculated iteratively.
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// The difference between wasted using 4st and 3rd record, will
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// be following area:
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// +---+
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// +--+ +-+ ++ +-+ +-+ +---+ | |
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// + xxxxxxxxxxxxxxxxxxxxxxxx | | | |
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// xxxxxxxxxxxxxxxxxxxxxxxx | | | |
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// + xxxxxxxxxxxxxxxxxxxxxxxx | | | |
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// | xxxxxxxxxxxxxxxxxxxxxxxx | | | |
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// +-+ +-+ +-+ ++ +---+ +--+ | | |
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// | | | | | | |
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// +---+ ++ | | | | | |
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// | | | | | | X | | |
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// +---+ ++ | | | | | | | |
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// | | | | | | | | | |
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// | | | | | | | | | |
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// | | | | | | | | | |
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// | | | | | | | | | |
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// | | | | | | | | | |
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// +---+ +---+ +---+ +---+ +---+
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//
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// which will be the size difference between 4st and 3rd record,
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// times 3, which is number of records before the 4st.
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// Here we assume that all data within the prefetch range will be useful. In
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// reality, it may not be the case when a partial block is inside the range,
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// or there are data in the middle that is not read. We ignore those cases
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// for simplicity.
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assert(!sorted.empty());
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size_t prev_size = sorted[0];
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size_t max_qualified_size = sorted[0];
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size_t wasted = 0;
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for (size_t i = 1; i < sorted.size(); i++) {
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size_t read = sorted[i] * sorted.size();
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wasted += (sorted[i] - prev_size) * i;
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if (wasted <= read / 8) {
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max_qualified_size = sorted[i];
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}
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prev_size = sorted[i];
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}
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const size_t kMaxPrefetchSize = 512 * 1024; // Never exceed 512KB
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return std::min(kMaxPrefetchSize, max_qualified_size);
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}
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BlockBasedTableFactory::BlockBasedTableFactory(
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const BlockBasedTableOptions& _table_options)
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: table_options_(_table_options) {
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@ -71,7 +202,8 @@ Status BlockBasedTableFactory::NewTableReader(
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table_options_, table_reader_options.internal_comparator, std::move(file),
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file_size, table_reader, table_reader_options.prefix_extractor,
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prefetch_index_and_filter_in_cache, table_reader_options.skip_filters,
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table_reader_options.level, table_reader_options.immortal);
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table_reader_options.level, table_reader_options.immortal,
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&tail_prefetch_stats_);
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}
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TableBuilder* BlockBasedTableFactory::NewTableBuilder(
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using std::unique_ptr;
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class BlockBasedTableBuilder;
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// A class used to track actual bytes written from the tail in the recent SST
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// file opens, and provide a suggestion for following open.
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class TailPrefetchStats {
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public:
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void RecordEffectiveSize(size_t len);
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// 0 indicates no information to determine.
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size_t GetSuggestedPrefetchSize();
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private:
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const static size_t kNumTracked = 32;
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size_t records_[kNumTracked];
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port::Mutex mutex_;
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size_t next_ = 0;
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size_t num_records_ = 0;
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};
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class BlockBasedTableFactory : public TableFactory {
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public:
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explicit BlockBasedTableFactory(
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@ -64,6 +80,7 @@ class BlockBasedTableFactory : public TableFactory {
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private:
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BlockBasedTableOptions table_options_;
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mutable TailPrefetchStats tail_prefetch_stats_;
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};
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extern const std::string kHashIndexPrefixesBlock;
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@ -731,7 +731,8 @@ Status BlockBasedTable::Open(const ImmutableCFOptions& ioptions,
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const SliceTransform* prefix_extractor,
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const bool prefetch_index_and_filter_in_cache,
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const bool skip_filters, const int level,
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const bool immortal_table) {
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const bool immortal_table,
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TailPrefetchStats* tail_prefetch_stats) {
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table_reader->reset();
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Footer footer;
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@ -741,29 +742,40 @@ Status BlockBasedTable::Open(const ImmutableCFOptions& ioptions,
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// prefetch both index and filters, down to all partitions
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const bool prefetch_all = prefetch_index_and_filter_in_cache || level == 0;
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const bool preload_all = !table_options.cache_index_and_filter_blocks;
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// Before read footer, readahead backwards to prefetch data. Do more readahead
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// if we're going to read index/filter.
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// TODO: This may incorrectly select small readahead in case partitioned
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// index/filter is enabled and top-level partition pinning is enabled. That's
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// because we need to issue readahead before we read the properties, at which
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// point we don't yet know the index type.
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const size_t kTailPrefetchSize =
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prefetch_all || preload_all ? 512 * 1024 : 4 * 1024;
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size_t tail_prefetch_size = 0;
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if (tail_prefetch_stats != nullptr) {
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// Multiple threads may get a 0 (no history) when running in parallel,
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// but it will get cleared after the first of them finishes.
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tail_prefetch_size = tail_prefetch_stats->GetSuggestedPrefetchSize();
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}
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if (tail_prefetch_size == 0) {
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// Before read footer, readahead backwards to prefetch data. Do more
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// readahead if we're going to read index/filter.
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// TODO: This may incorrectly select small readahead in case partitioned
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// index/filter is enabled and top-level partition pinning is enabled.
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// That's because we need to issue readahead before we read the properties,
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// at which point we don't yet know the index type.
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tail_prefetch_size = prefetch_all || preload_all ? 512 * 1024 : 4 * 1024;
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}
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size_t prefetch_off;
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size_t prefetch_len;
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if (file_size < kTailPrefetchSize) {
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if (file_size < tail_prefetch_size) {
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prefetch_off = 0;
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prefetch_len = static_cast<size_t>(file_size);
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} else {
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prefetch_off = static_cast<size_t>(file_size - kTailPrefetchSize);
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prefetch_len = kTailPrefetchSize;
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prefetch_off = static_cast<size_t>(file_size - tail_prefetch_size);
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prefetch_len = tail_prefetch_size;
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}
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TEST_SYNC_POINT_CALLBACK("BlockBasedTable::Open::TailPrefetchLen",
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&tail_prefetch_size);
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Status s;
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// TODO should not have this special logic in the future.
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if (!file->use_direct_io()) {
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prefetch_buffer.reset(new FilePrefetchBuffer(nullptr, 0, 0, false, true));
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s = file->Prefetch(prefetch_off, prefetch_len);
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} else {
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prefetch_buffer.reset(new FilePrefetchBuffer());
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prefetch_buffer.reset(new FilePrefetchBuffer(nullptr, 0, 0, true, true));
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s = prefetch_buffer->Prefetch(file.get(), prefetch_off, prefetch_len);
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}
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s = ReadFooterFromFile(file.get(), prefetch_buffer.get(), file_size, &footer,
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@ -1060,6 +1072,12 @@ Status BlockBasedTable::Open(const ImmutableCFOptions& ioptions,
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}
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if (s.ok()) {
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assert(prefetch_buffer.get() != nullptr);
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if (tail_prefetch_stats != nullptr) {
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assert(prefetch_buffer->min_offset_read() < file_size);
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tail_prefetch_stats->RecordEffectiveSize(
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file_size - prefetch_buffer->min_offset_read());
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}
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*table_reader = std::move(new_table);
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}
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@ -23,6 +23,7 @@
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#include "rocksdb/status.h"
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#include "rocksdb/table.h"
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#include "table/block.h"
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#include "table/block_based_table_factory.h"
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#include "table/filter_block.h"
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#include "table/format.h"
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#include "table/persistent_cache_helper.h"
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@ -93,7 +94,8 @@ class BlockBasedTable : public TableReader {
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const SliceTransform* prefix_extractor = nullptr,
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bool prefetch_index_and_filter_in_cache = true,
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bool skip_filters = false, int level = -1,
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const bool immortal_table = false);
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const bool immortal_table = false,
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TailPrefetchStats* tail_prefetch_stats = nullptr);
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bool PrefixMayMatch(const Slice& internal_key,
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const ReadOptions& read_options,
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@ -1075,6 +1075,7 @@ class BlockBasedTableTest
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};
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class PlainTableTest : public TableTest {};
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class TablePropertyTest : public testing::Test {};
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class BBTTailPrefetchTest : public TableTest {};
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INSTANTIATE_TEST_CASE_P(FormatDef, BlockBasedTableTest,
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testing::Values(test::kDefaultFormatVersion));
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@ -3594,6 +3595,49 @@ TEST_P(BlockBasedTableTest, BadOptions) {
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ASSERT_NOK(rocksdb::DB::Open(options, kDBPath, &db));
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}
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TEST_F(BBTTailPrefetchTest, TestTailPrefetchStats) {
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TailPrefetchStats tpstats;
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ASSERT_EQ(0, tpstats.GetSuggestedPrefetchSize());
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tpstats.RecordEffectiveSize(size_t{1000});
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tpstats.RecordEffectiveSize(size_t{1005});
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tpstats.RecordEffectiveSize(size_t{1002});
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ASSERT_EQ(1005, tpstats.GetSuggestedPrefetchSize());
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// One single super large value shouldn't influence much
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tpstats.RecordEffectiveSize(size_t{1002000});
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tpstats.RecordEffectiveSize(size_t{999});
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ASSERT_LE(1005, tpstats.GetSuggestedPrefetchSize());
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ASSERT_GT(1200, tpstats.GetSuggestedPrefetchSize());
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// Only history of 32 is kept
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for (int i = 0; i < 32; i++) {
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tpstats.RecordEffectiveSize(size_t{100});
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}
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ASSERT_EQ(100, tpstats.GetSuggestedPrefetchSize());
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// 16 large values and 16 small values. The result should be closer
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// to the small value as the algorithm.
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for (int i = 0; i < 16; i++) {
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tpstats.RecordEffectiveSize(size_t{1000});
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}
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tpstats.RecordEffectiveSize(size_t{10});
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tpstats.RecordEffectiveSize(size_t{20});
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for (int i = 0; i < 6; i++) {
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tpstats.RecordEffectiveSize(size_t{100});
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}
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ASSERT_LE(80, tpstats.GetSuggestedPrefetchSize());
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ASSERT_GT(200, tpstats.GetSuggestedPrefetchSize());
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}
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TEST_F(BBTTailPrefetchTest, FilePrefetchBufferMinOffset) {
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TailPrefetchStats tpstats;
|
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FilePrefetchBuffer buffer(nullptr, 0, 0, false, true);
|
||||
buffer.TryReadFromCache(500, 10, nullptr);
|
||||
buffer.TryReadFromCache(480, 10, nullptr);
|
||||
buffer.TryReadFromCache(490, 10, nullptr);
|
||||
ASSERT_EQ(480, buffer.min_offset_read());
|
||||
}
|
||||
|
||||
} // namespace rocksdb
|
||||
|
||||
int main(int argc, char** argv) {
|
||||
|
@ -714,7 +714,10 @@ Status FilePrefetchBuffer::Prefetch(RandomAccessFileReader* reader,
|
||||
|
||||
bool FilePrefetchBuffer::TryReadFromCache(uint64_t offset, size_t n,
|
||||
Slice* result) {
|
||||
if (offset < buffer_offset_) {
|
||||
if (track_min_offset_ && offset < min_offset_read_) {
|
||||
min_offset_read_ = offset;
|
||||
}
|
||||
if (!enable_ || offset < buffer_offset_) {
|
||||
return false;
|
||||
}
|
||||
|
||||
|
@ -213,21 +213,38 @@ class WritableFileWriter {
|
||||
// readahead_size will be doubled on every IO, until max_readahead_size.
|
||||
class FilePrefetchBuffer {
|
||||
public:
|
||||
// If `track_min_offset` is true, track minimum offset ever read.
|
||||
FilePrefetchBuffer(RandomAccessFileReader* file_reader = nullptr,
|
||||
size_t readadhead_size = 0, size_t max_readahead_size = 0)
|
||||
size_t readadhead_size = 0, size_t max_readahead_size = 0,
|
||||
bool enable = true, bool track_min_offset = false)
|
||||
: buffer_offset_(0),
|
||||
file_reader_(file_reader),
|
||||
readahead_size_(readadhead_size),
|
||||
max_readahead_size_(max_readahead_size) {}
|
||||
max_readahead_size_(max_readahead_size),
|
||||
min_offset_read_(port::kMaxSizet),
|
||||
enable_(enable),
|
||||
track_min_offset_(track_min_offset) {}
|
||||
Status Prefetch(RandomAccessFileReader* reader, uint64_t offset, size_t n);
|
||||
bool TryReadFromCache(uint64_t offset, size_t n, Slice* result);
|
||||
|
||||
// The minimum `offset` ever passed to TryReadFromCache(). Only be tracked
|
||||
// if track_min_offset = true.
|
||||
size_t min_offset_read() const { return min_offset_read_; }
|
||||
|
||||
private:
|
||||
AlignedBuffer buffer_;
|
||||
uint64_t buffer_offset_;
|
||||
RandomAccessFileReader* file_reader_;
|
||||
size_t readahead_size_;
|
||||
size_t max_readahead_size_;
|
||||
// The minimum `offset` ever passed to TryReadFromCache().
|
||||
size_t min_offset_read_;
|
||||
// if false, TryReadFromCache() always return false, and we only take stats
|
||||
// for track_min_offset_ if track_min_offset_ = true
|
||||
bool enable_;
|
||||
// If true, track minimum `offset` ever passed to TryReadFromCache(), which
|
||||
// can be fetched from min_offset_read().
|
||||
bool track_min_offset_;
|
||||
};
|
||||
|
||||
extern Status NewWritableFile(Env* env, const std::string& fname,
|
||||
|
Loading…
Reference in New Issue
Block a user