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Combine the read-ahead logic for user reads and compaction reads (#5431)

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Summary:
Currently the read-ahead logic for user reads and compaction reads go through different code paths where compaction reads create new table readers and use `ReadaheadRandomAccessFile`. This change is to unify read-ahead logic to use read-ahead in BlockBasedTableReader::InitDataBlock(). As a result of the change  `ReadAheadRandomAccessFile` class and `new_table_reader_for_compaction_inputs` option will no longer be used.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/5431

Test Plan:
make check

Here is the benchmarking - https://gist.github.com/vjnadimpalli/083cf423f7b6aa12dcdb14c858bc18a5

Differential Revision: D15772533

Pulled By: vjnadimpalli

fbshipit-source-id: b71dca710590471ede6fb37553388654e2e479b9
main
Vijay Nadimpalli 5 years ago committed by Facebook Github Bot
parent fe90ed7a70
commit 24b118ad98
19 changed files with 124 additions and 126 deletions
Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL
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  1. 21
      db/db_compaction_test.cc
  2. 62
      db/table_cache.cc
  3. 3
      db/table_cache.h
  4. 2
      include/rocksdb/options.h
  5. 37
      table/block_based/block_based_table_reader.cc
  6. 19
      table/block_based/block_based_table_reader.h
  7. 5
      table/block_fetcher.cc
  8. 8
      table/block_fetcher.h
  9. 3
      table/cuckoo/cuckoo_table_reader.cc
  10. 6
      table/cuckoo/cuckoo_table_reader.h
  11. 11
      table/meta_blocks.cc
  12. 3
      table/mock_table.cc
  13. 3
      table/mock_table.h
  14. 3
      table/plain/plain_table_reader.cc
  15. 6
      table/plain/plain_table_reader.h
  16. 11
      table/table_reader.h
  17. 16
      util/file_reader_writer.cc
  18. 11
      util/file_reader_writer.h

21
db/db_compaction_test.cc
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@ -497,14 +497,14 @@ TEST_F(DBCompactionTest, TestTableReaderForCompaction) {
// Create new iterator for:
// (1) 1 for verifying flush results
// (2) 3 for compaction input files
// (3) 1 for verifying compaction results.
ASSERT_EQ(num_new_table_reader, 5);
// (2) 1 for verifying compaction results.
// (3) New TableReaders will not be created for compaction inputs
ASSERT_EQ(num_new_table_reader, 2);
num_table_cache_lookup = 0;
num_new_table_reader = 0;
ASSERT_EQ(Key(1), Get(Key(1)));
ASSERT_EQ(num_table_cache_lookup + old_num_table_cache_lookup2, 3);
ASSERT_EQ(num_table_cache_lookup + old_num_table_cache_lookup2, 5);
ASSERT_EQ(num_new_table_reader, 0);
num_table_cache_lookup = 0;
@ -519,13 +519,14 @@ TEST_F(DBCompactionTest, TestTableReaderForCompaction) {
// May preload table cache too.
ASSERT_GE(num_table_cache_lookup, 1);
old_num_table_cache_lookup2 = num_table_cache_lookup;
// One for compaction input, one for verifying compaction results.
ASSERT_EQ(num_new_table_reader, 2);
// One for verifying compaction results.
// No new iterator created for compaction.
ASSERT_EQ(num_new_table_reader, 1);
num_table_cache_lookup = 0;
num_new_table_reader = 0;
ASSERT_EQ(Key(1), Get(Key(1)));
ASSERT_EQ(num_table_cache_lookup + old_num_table_cache_lookup2, 2);
ASSERT_EQ(num_table_cache_lookup + old_num_table_cache_lookup2, 3);
ASSERT_EQ(num_new_table_reader, 0);
rocksdb::SyncPoint::GetInstance()->ClearAllCallBacks();
@ -4339,12 +4340,6 @@ TEST_P(DBCompactionDirectIOTest, DirectIO) {
options.env = new MockEnv(Env::Default());
Reopen(options);
bool readahead = false;
SyncPoint::GetInstance()->SetCallBack(
"TableCache::NewIterator:for_compaction", [&](void* arg) {
bool* use_direct_reads = static_cast<bool*>(arg);
ASSERT_EQ(*use_direct_reads,
options.use_direct_reads);
});
SyncPoint::GetInstance()->SetCallBack(
"CompactionJob::OpenCompactionOutputFile", [&](void* arg) {
bool* use_direct_writes = static_cast<bool*>(arg);

62
db/table_cache.cc
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@ -16,6 +16,7 @@
#include "monitoring/perf_context_imp.h"
#include "rocksdb/statistics.h"
#include "table/block_based/block_based_table_reader.h"
#include "table/get_context.h"
#include "table/internal_iterator.h"
#include "table/iterator_wrapper.h"
@ -43,13 +44,6 @@ static void UnrefEntry(void* arg1, void* arg2) {
cache->Release(h);
}
static void DeleteTableReader(void* arg1, void* arg2) {
TableReader* table_reader = reinterpret_cast<TableReader*>(arg1);
Statistics* stats = reinterpret_cast<Statistics*>(arg2);
RecordTick(stats, NO_FILE_CLOSES);
delete table_reader;
}
static Slice GetSliceForFileNumber(const uint64_t* file_number) {
return Slice(reinterpret_cast<const char*>(file_number),
sizeof(*file_number));
@ -96,8 +90,8 @@ void TableCache::ReleaseHandle(Cache::Handle* handle) {
Status TableCache::GetTableReader(
const EnvOptions& env_options,
const InternalKeyComparator& internal_comparator, const FileDescriptor& fd,
bool sequential_mode, size_t readahead, bool record_read_stats,
HistogramImpl* file_read_hist, std::unique_ptr<TableReader>* table_reader,
bool sequential_mode, bool record_read_stats, HistogramImpl* file_read_hist,
std::unique_ptr<TableReader>* table_reader,
const SliceTransform* prefix_extractor, bool skip_filters, int level,
bool prefetch_index_and_filter_in_cache, bool for_compaction) {
std::string fname =
@ -107,13 +101,6 @@ Status TableCache::GetTableReader(
RecordTick(ioptions_.statistics, NO_FILE_OPENS);
if (s.ok()) {
if (readahead > 0 && !env_options.use_mmap_reads) {
// Not compatible with mmap files since ReadaheadRandomAccessFile requires
// its wrapped file's Read() to copy data into the provided scratch
// buffer, which mmap files don't use.
// TODO(ajkr): try madvise for mmap files in place of buffered readahead.
file = NewReadaheadRandomAccessFile(std::move(file), readahead);
}
if (!sequential_mode && ioptions_.advise_random_on_open) {
file->Hint(RandomAccessFile::RANDOM);
}
@ -164,10 +151,9 @@ Status TableCache::FindTable(const EnvOptions& env_options,
}
std::unique_ptr<TableReader> table_reader;
s = GetTableReader(env_options, internal_comparator, fd,
false /* sequential mode */, 0 /* readahead */,
record_read_stats, file_read_hist, &table_reader,
prefix_extractor, skip_filters, level,
prefetch_index_and_filter_in_cache);
false /* sequential mode */, record_read_stats,
file_read_hist, &table_reader, prefix_extractor,
skip_filters, level, prefetch_index_and_filter_in_cache);
if (!s.ok()) {
assert(table_reader == nullptr);
RecordTick(ioptions_.statistics, NO_FILE_ERRORS);
@ -196,39 +182,13 @@ InternalIterator* TableCache::NewIterator(
PERF_TIMER_GUARD(new_table_iterator_nanos);
Status s;
bool create_new_table_reader = false;
TableReader* table_reader = nullptr;
Cache::Handle* handle = nullptr;
if (table_reader_ptr != nullptr) {
*table_reader_ptr = nullptr;
}
size_t readahead = 0;
if (for_compaction) {
#ifndef NDEBUG
bool use_direct_reads_for_compaction = env_options.use_direct_reads;
TEST_SYNC_POINT_CALLBACK("TableCache::NewIterator:for_compaction",
&use_direct_reads_for_compaction);
#endif // !NDEBUG
if (ioptions_.new_table_reader_for_compaction_inputs) {
// get compaction_readahead_size from env_options allows us to set the
// value dynamically
readahead = env_options.compaction_readahead_size;
create_new_table_reader = true;
}
}
auto& fd = file_meta.fd;
if (create_new_table_reader) {
std::unique_ptr<TableReader> table_reader_unique_ptr;
s = GetTableReader(
env_options, icomparator, fd, true /* sequential_mode */, readahead,
!for_compaction /* record stats */, nullptr, &table_reader_unique_ptr,
prefix_extractor, false /* skip_filters */, level,
true /* prefetch_index_and_filter_in_cache */, for_compaction);
if (s.ok()) {
table_reader = table_reader_unique_ptr.release();
}
} else {
table_reader = fd.table_reader;
if (table_reader == nullptr) {
s = FindTable(env_options, icomparator, fd, &handle, prefix_extractor,
@ -239,7 +199,6 @@ InternalIterator* TableCache::NewIterator(
table_reader = GetTableReaderFromHandle(handle);
}
}
}
InternalIterator* result = nullptr;
if (s.ok()) {
if (options.table_filter &&
@ -247,13 +206,10 @@ InternalIterator* TableCache::NewIterator(
result = NewEmptyInternalIterator<Slice>(arena);
} else {
result = table_reader->NewIterator(options, prefix_extractor, arena,
skip_filters, for_compaction);
skip_filters, for_compaction,
env_options.compaction_readahead_size);
}
if (create_new_table_reader) {
assert(handle == nullptr);
result->RegisterCleanup(&DeleteTableReader, table_reader,
ioptions_.statistics);
} else if (handle != nullptr) {
if (handle != nullptr) {
result->RegisterCleanup(&UnrefEntry, cache_, handle);
handle = nullptr; // prevent from releasing below
}

3
db/table_cache.h
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@ -177,8 +177,7 @@ class TableCache {
Status GetTableReader(const EnvOptions& env_options,
const InternalKeyComparator& internal_comparator,
const FileDescriptor& fd, bool sequential_mode,
size_t readahead, bool record_read_stats,
HistogramImpl* file_read_hist,
bool record_read_stats, HistogramImpl* file_read_hist,
std::unique_ptr<TableReader>* table_reader,
const SliceTransform* prefix_extractor = nullptr,
bool skip_filters = false, int level = -1,

2
include/rocksdb/options.h
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@ -760,6 +760,8 @@ struct DBOptions {
// for this mode if using block-based table.
//
// Default: false
// This flag has no affect on the behavior of compaction and plan to delete
// in the future.
bool new_table_reader_for_compaction_inputs = false;
// If non-zero, we perform bigger reads when doing compaction. If you're

37
table/block_based/block_based_table_reader.cc
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@ -83,12 +83,13 @@ Status ReadBlockFromFile(
bool do_uncompress, bool maybe_compressed, BlockType block_type,
const UncompressionDict& uncompression_dict,
const PersistentCacheOptions& cache_options, SequenceNumber global_seqno,
size_t read_amp_bytes_per_bit, MemoryAllocator* memory_allocator) {
size_t read_amp_bytes_per_bit, MemoryAllocator* memory_allocator,
bool for_compaction = false) {
BlockContents contents;
BlockFetcher block_fetcher(file, prefetch_buffer, footer, options, handle,
&contents, ioptions, do_uncompress,
maybe_compressed, block_type, uncompression_dict,
cache_options, memory_allocator);
BlockFetcher block_fetcher(
file, prefetch_buffer, footer, options, handle, &contents, ioptions,
do_uncompress, maybe_compressed, block_type, uncompression_dict,
cache_options, memory_allocator, nullptr, for_compaction);
Status s = block_fetcher.ReadBlockContents();
if (s.ok()) {
result->reset(new Block(std::move(contents), global_seqno,
@ -2075,7 +2076,7 @@ TBlockIter* BlockBasedTable::NewDataBlockIterator(
const ReadOptions& ro, const BlockHandle& handle, TBlockIter* input_iter,
BlockType block_type, bool key_includes_seq, bool index_key_is_full,
GetContext* get_context, BlockCacheLookupContext* lookup_context, Status s,
FilePrefetchBuffer* prefetch_buffer) const {
FilePrefetchBuffer* prefetch_buffer, bool for_compaction) const {
PERF_TIMER_GUARD(new_table_block_iter_nanos);
TBlockIter* iter = input_iter != nullptr ? input_iter : new TBlockIter;
@ -2094,7 +2095,7 @@ TBlockIter* BlockBasedTable::NewDataBlockIterator(
CachableEntry<Block> block;
s = RetrieveBlock(prefetch_buffer, ro, handle, uncompression_dict, &block,
block_type, get_context, lookup_context);
block_type, get_context, lookup_context, for_compaction);
if (!s.ok()) {
assert(block.IsEmpty());
@ -2144,6 +2145,7 @@ TBlockIter* BlockBasedTable::NewDataBlockIterator(
s = block_cache->Insert(unique_key, nullptr,
block.GetValue()->ApproximateMemoryUsage(),
nullptr, &cache_handle);
if (s.ok()) {
assert(cache_handle != nullptr);
iter->RegisterCleanup(&ForceReleaseCachedEntry, block_cache,
@ -2297,7 +2299,8 @@ Status BlockBasedTable::RetrieveBlock(
FilePrefetchBuffer* prefetch_buffer, const ReadOptions& ro,
const BlockHandle& handle, const UncompressionDict& uncompression_dict,
CachableEntry<Block>* block_entry, BlockType block_type,
GetContext* get_context, BlockCacheLookupContext* lookup_context) const {
GetContext* get_context, BlockCacheLookupContext* lookup_context,
bool for_compaction) const {
assert(block_entry);
assert(block_entry->IsEmpty());
@ -2340,7 +2343,7 @@ Status BlockBasedTable::RetrieveBlock(
block_type == BlockType::kData
? rep_->table_options.read_amp_bytes_per_bit
: 0,
GetMemoryAllocator(rep_->table_options));
GetMemoryAllocator(rep_->table_options), for_compaction);
}
if (!s.ok()) {
@ -2714,13 +2717,18 @@ void BlockBasedTableIterator<TBlockIter, TValue>::InitDataBlock() {
rep->file.get(), read_options_.readahead_size,
read_options_.readahead_size));
}
} else if (!prefetch_buffer_) {
prefetch_buffer_.reset(
new FilePrefetchBuffer(rep->file.get(), compaction_readahead_size_,
compaction_readahead_size_));
}
Status s;
table_->NewDataBlockIterator<TBlockIter>(
read_options_, data_block_handle, &block_iter_, block_type_,
key_includes_seq_, index_key_is_full_,
/*get_context=*/nullptr, &lookup_context_, s, prefetch_buffer_.get());
/*get_context=*/nullptr, &lookup_context_, s, prefetch_buffer_.get(),
for_compaction_);
block_iter_points_to_real_block_ = true;
}
}
@ -2806,7 +2814,8 @@ void BlockBasedTableIterator<TBlockIter, TValue>::CheckOutOfBound() {
InternalIterator* BlockBasedTable::NewIterator(
const ReadOptions& read_options, const SliceTransform* prefix_extractor,
Arena* arena, bool skip_filters, bool for_compaction) {
Arena* arena, bool skip_filters, bool for_compaction,
size_t compaction_readahead_size) {
BlockCacheLookupContext lookup_context{
for_compaction ? BlockCacheLookupCaller::kCompaction
: BlockCacheLookupCaller::kUserIterator};
@ -2823,7 +2832,8 @@ InternalIterator* BlockBasedTable::NewIterator(
!skip_filters && !read_options.total_order_seek &&
prefix_extractor != nullptr,
need_upper_bound_check, prefix_extractor, BlockType::kData,
true /*key_includes_seq*/, true /*index_key_is_full*/, for_compaction);
true /*key_includes_seq*/, true /*index_key_is_full*/, for_compaction,
compaction_readahead_size);
} else {
auto* mem =
arena->AllocateAligned(sizeof(BlockBasedTableIterator<DataBlockIter>));
@ -2835,7 +2845,8 @@ InternalIterator* BlockBasedTable::NewIterator(
!skip_filters && !read_options.total_order_seek &&
prefix_extractor != nullptr,
need_upper_bound_check, prefix_extractor, BlockType::kData,
true /*key_includes_seq*/, true /*index_key_is_full*/, for_compaction);
true /*key_includes_seq*/, true /*index_key_is_full*/, for_compaction,
compaction_readahead_size);
}
}

19
table/block_based/block_based_table_reader.h
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@ -123,6 +123,8 @@ class BlockBasedTable : public TableReader {
// The result of NewIterator() is initially invalid (caller must
// call one of the Seek methods on the iterator before using it).
// @param skip_filters Disables loading/accessing the filter block
// compaction_readahead_size: its value will only be used if for_compaction =
// true
InternalIterator* NewIterator(
const ReadOptions&, const SliceTransform* prefix_extractor,
Arena* arena = nullptr, bool skip_filters = false,
@ -131,7 +133,8 @@ class BlockBasedTable : public TableReader {
// i.e., it will populate the block cache with blocks in the new SST
// files. We treat those as a user is calling iterator for now. We should
// differentiate the callers.
bool for_compaction = false) override;
bool for_compaction = false,
size_t compaction_readahead_size = 0) override;
FragmentedRangeTombstoneIterator* NewRangeTombstoneIterator(
const ReadOptions& read_options) override;
@ -234,7 +237,7 @@ class BlockBasedTable : public TableReader {
TBlockIter* input_iter, BlockType block_type, bool key_includes_seq,
bool index_key_is_full, GetContext* get_context,
BlockCacheLookupContext* lookup_context, Status s,
FilePrefetchBuffer* prefetch_buffer) const;
FilePrefetchBuffer* prefetch_buffer, bool for_compaction = false) const;
class PartitionedIndexIteratorState;
@ -283,7 +286,8 @@ class BlockBasedTable : public TableReader {
const UncompressionDict& uncompression_dict,
CachableEntry<Block>* block_entry, BlockType block_type,
GetContext* get_context,
BlockCacheLookupContext* lookup_context) const;
BlockCacheLookupContext* lookup_context,
bool for_compaction = false) const;
// For the following two functions:
// if `no_io == true`, we will not try to read filter/index from sst file
@ -596,6 +600,8 @@ struct BlockBasedTable::Rep {
// Iterates over the contents of BlockBasedTable.
template <class TBlockIter, typename TValue = Slice>
class BlockBasedTableIterator : public InternalIteratorBase<TValue> {
// compaction_readahead_size: its value will only be used if for_compaction =
// true
public:
BlockBasedTableIterator(const BlockBasedTable* table,
const ReadOptions& read_options,
@ -605,7 +611,8 @@ class BlockBasedTableIterator : public InternalIteratorBase<TValue> {
const SliceTransform* prefix_extractor,
BlockType block_type, bool key_includes_seq = true,
bool index_key_is_full = true,
bool for_compaction = false)
bool for_compaction = false,
size_t compaction_readahead_size = 0)
: InternalIteratorBase<TValue>(false),
table_(table),
read_options_(read_options),
@ -621,6 +628,7 @@ class BlockBasedTableIterator : public InternalIteratorBase<TValue> {
key_includes_seq_(key_includes_seq),
index_key_is_full_(index_key_is_full),
for_compaction_(for_compaction),
compaction_readahead_size_(compaction_readahead_size),
lookup_context_(for_compaction
? BlockCacheLookupCaller::kCompaction
: BlockCacheLookupCaller::kUserIterator) {}
@ -734,6 +742,9 @@ class BlockBasedTableIterator : public InternalIteratorBase<TValue> {
bool index_key_is_full_;
// If this iterator is created for compaction
bool for_compaction_;
// Readahead size used in compaction, its value is used only if
// for_compaction_ = true
size_t compaction_readahead_size_;
BlockHandle prev_index_value_;
BlockCacheLookupContext lookup_context_;

5
table/block_fetcher.cc
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@ -93,7 +93,8 @@ inline bool BlockFetcher::TryGetFromPrefetchBuffer() {
if (prefetch_buffer_ != nullptr &&
prefetch_buffer_->TryReadFromCache(
handle_.offset(),
static_cast<size_t>(handle_.size()) + kBlockTrailerSize, &slice_)) {
static_cast<size_t>(handle_.size()) + kBlockTrailerSize, &slice_,
for_compaction_)) {
block_size_ = static_cast<size_t>(handle_.size());
CheckBlockChecksum();
if (!status_.ok()) {
@ -217,7 +218,7 @@ Status BlockFetcher::ReadBlockContents() {
PERF_TIMER_GUARD(block_read_time);
// Actual file read
status_ = file_->Read(handle_.offset(), block_size_ + kBlockTrailerSize,
&slice_, used_buf_);
&slice_, used_buf_, for_compaction_);
}
PERF_COUNTER_ADD(block_read_count, 1);

8
table/block_fetcher.h
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@ -44,7 +44,8 @@ class BlockFetcher {
const UncompressionDict& uncompression_dict,
const PersistentCacheOptions& cache_options,
MemoryAllocator* memory_allocator = nullptr,
MemoryAllocator* memory_allocator_compressed = nullptr)
MemoryAllocator* memory_allocator_compressed = nullptr,
bool for_compaction = false)
: file_(file),
prefetch_buffer_(prefetch_buffer),
footer_(footer),
@ -58,7 +59,9 @@ class BlockFetcher {
uncompression_dict_(uncompression_dict),
cache_options_(cache_options),
memory_allocator_(memory_allocator),
memory_allocator_compressed_(memory_allocator_compressed) {}
memory_allocator_compressed_(memory_allocator_compressed),
for_compaction_(for_compaction) {}
Status ReadBlockContents();
CompressionType get_compression_type() const { return compression_type_; }
@ -88,6 +91,7 @@ class BlockFetcher {
char stack_buf_[kDefaultStackBufferSize];
bool got_from_prefetch_buffer_ = false;
rocksdb::CompressionType compression_type_;
bool for_compaction_ = false;
// return true if found
bool TryGetUncompressBlockFromPersistentCache();

3
table/cuckoo/cuckoo_table_reader.cc
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@ -377,7 +377,8 @@ Slice CuckooTableIterator::value() const {
InternalIterator* CuckooTableReader::NewIterator(
const ReadOptions& /*read_options*/,
const SliceTransform* /* prefix_extractor */, Arena* arena,
bool /*skip_filters*/, bool /*for_compaction*/) {
bool /*skip_filters*/, bool /*for_compaction*/,
size_t /*compaction_readahead_size*/) {
if (!status().ok()) {
return NewErrorInternalIterator<Slice>(
Status::Corruption("CuckooTableReader status is not okay."), arena);

6
table/cuckoo/cuckoo_table_reader.h
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@ -45,11 +45,15 @@ class CuckooTableReader: public TableReader {
GetContext* get_context, const SliceTransform* prefix_extractor,
bool skip_filters = false) override;
// Returns a new iterator over table contents
// compaction_readahead_size: its value will only be used if for_compaction =
// true
InternalIterator* NewIterator(const ReadOptions&,
const SliceTransform* prefix_extractor,
Arena* arena = nullptr,
bool skip_filters = false,
bool for_compaction = false) override;
bool for_compaction = false,
size_t compaction_readahead_size = 0) override;
void Prepare(const Slice& target) override;
// Report an approximation of how much memory has been used.

11
table/meta_blocks.cc
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@ -487,12 +487,11 @@ Status ReadMetaBlock(RandomAccessFileReader* file,
read_options.verify_checksums = false;
PersistentCacheOptions cache_options;
BlockFetcher block_fetcher(file, prefetch_buffer, footer, read_options,
metaindex_handle, &metaindex_contents, ioptions,
false /* decompress */, false /*maybe_compressed*/,
BlockType::kMetaIndex,
UncompressionDict::GetEmptyDict(), cache_options,
memory_allocator);
BlockFetcher block_fetcher(
file, prefetch_buffer, footer, read_options, metaindex_handle,
&metaindex_contents, ioptions, false /* decompress */,
false /*maybe_compressed*/, BlockType::kMetaIndex,
UncompressionDict::GetEmptyDict(), cache_options, memory_allocator);
status = block_fetcher.ReadBlockContents();
if (!status.ok()) {
return status;

3
table/mock_table.cc
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@ -34,7 +34,8 @@ stl_wrappers::KVMap MakeMockFile(
InternalIterator* MockTableReader::NewIterator(
const ReadOptions&, const SliceTransform* /* prefix_extractor */,
Arena* /*arena*/, bool /*skip_filters*/, bool /*for_compaction*/) {
Arena* /*arena*/, bool /*skip_filters*/, bool /*for_compaction*/,
size_t /*compaction_readahead_size*/) {
return new MockTableIterator(table_);
}

3
table/mock_table.h
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@ -44,7 +44,8 @@ class MockTableReader : public TableReader {
const SliceTransform* prefix_extractor,
Arena* arena = nullptr,
bool skip_filters = false,
bool for_compaction = false) override;
bool for_compaction = false,
size_t compaction_readahead_size = 0) override;
Status Get(const ReadOptions& readOptions, const Slice& key,
GetContext* get_context, const SliceTransform* prefix_extractor,

3
table/plain/plain_table_reader.cc
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@ -196,7 +196,8 @@ void PlainTableReader::SetupForCompaction() {
InternalIterator* PlainTableReader::NewIterator(
const ReadOptions& options, const SliceTransform* /* prefix_extractor */,
Arena* arena, bool /*skip_filters*/, bool /*for_compaction*/) {
Arena* arena, bool /*skip_filters*/, bool /*for_compaction*/,
size_t /*compaction_readahead_size*/) {
bool use_prefix_seek = !IsTotalOrderMode() && !options.total_order_seek;
if (arena == nullptr) {
return new PlainTableIterator(this, use_prefix_seek);

6
table/plain/plain_table_reader.h
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@ -77,11 +77,15 @@ class PlainTableReader: public TableReader {
bool full_scan_mode, const bool immortal_table = false,
const SliceTransform* prefix_extractor = nullptr);
// Returns new iterator over table contents
// compaction_readahead_size: its value will only be used if for_compaction =
// true
InternalIterator* NewIterator(const ReadOptions&,
const SliceTransform* prefix_extractor,
Arena* arena = nullptr,
bool skip_filters = false,
bool for_compaction = false) override;
bool for_compaction = false,
size_t compaction_readahead_size = 0) override;
void Prepare(const Slice& target) override;

11
table/table_reader.h
Unescape View File

@ -44,11 +44,12 @@ class TableReader {
// all the states but those allocated in arena.
// skip_filters: disables checking the bloom filters even if they exist. This
// option is effective only for block-based table format.
virtual InternalIterator* NewIterator(const ReadOptions&,
const SliceTransform* prefix_extractor,
Arena* arena = nullptr,
bool skip_filters = false,
bool for_compaction = false) = 0;
// compaction_readahead_size: its value will only be used if for_compaction =
// true
virtual InternalIterator* NewIterator(
const ReadOptions&, const SliceTransform* prefix_extractor,
Arena* arena = nullptr, bool skip_filters = false,
bool for_compaction = false, size_t compaction_readahead_size = 0) = 0;
virtual FragmentedRangeTombstoneIterator* NewRangeTombstoneIterator(
const ReadOptions& /*read_options*/) {

16
util/file_reader_writer.cc
Unescape View File

@ -70,7 +70,7 @@ Status SequentialFileReader::Skip(uint64_t n) {
}
Status RandomAccessFileReader::Read(uint64_t offset, size_t n, Slice* result,
char* scratch) const {
char* scratch, bool for_compaction) const {
Status s;
uint64_t elapsed = 0;
{
@ -90,7 +90,7 @@ Status RandomAccessFileReader::Read(uint64_t offset, size_t n, Slice* result,
buf.AllocateNewBuffer(read_size);
while (buf.CurrentSize() < read_size) {
size_t allowed;
if (for_compaction_ && rate_limiter_ != nullptr) {
if (for_compaction && rate_limiter_ != nullptr) {
allowed = rate_limiter_->RequestToken(
buf.Capacity() - buf.CurrentSize(), buf.Alignment(),
Env::IOPriority::IO_LOW, stats_, RateLimiter::OpType::kRead);
@ -134,7 +134,7 @@ Status RandomAccessFileReader::Read(uint64_t offset, size_t n, Slice* result,
const char* res_scratch = nullptr;
while (pos < n) {
size_t allowed;
if (for_compaction_ && rate_limiter_ != nullptr) {
if (for_compaction && rate_limiter_ != nullptr) {
if (rate_limiter_->IsRateLimited(RateLimiter::OpType::kRead)) {
sw.DelayStart();
}
@ -711,7 +711,8 @@ private:
} // namespace
Status FilePrefetchBuffer::Prefetch(RandomAccessFileReader* reader,
uint64_t offset, size_t n) {
uint64_t offset, size_t n,
bool for_compaction) {
size_t alignment = reader->file()->GetRequiredBufferAlignment();
size_t offset_ = static_cast<size_t>(offset);
uint64_t rounddown_offset = Rounddown(offset_, alignment);
@ -771,7 +772,7 @@ Status FilePrefetchBuffer::Prefetch(RandomAccessFileReader* reader,
Slice result;
s = reader->Read(rounddown_offset + chunk_len,
static_cast<size_t>(roundup_len - chunk_len), &result,
buffer_.BufferStart() + chunk_len);
buffer_.BufferStart() + chunk_len, for_compaction);
if (s.ok()) {
buffer_offset_ = rounddown_offset;
buffer_.Size(static_cast<size_t>(chunk_len) + result.size());
@ -780,7 +781,7 @@ Status FilePrefetchBuffer::Prefetch(RandomAccessFileReader* reader,
}
bool FilePrefetchBuffer::TryReadFromCache(uint64_t offset, size_t n,
Slice* result) {
Slice* result, bool for_compaction) {
if (track_min_offset_ && offset < min_offset_read_) {
min_offset_read_ = static_cast<size_t>(offset);
}
@ -797,7 +798,8 @@ bool FilePrefetchBuffer::TryReadFromCache(uint64_t offset, size_t n,
assert(file_reader_ != nullptr);
assert(max_readahead_size_ >= readahead_size_);
Status s = Prefetch(file_reader_, offset, n + readahead_size_);
Status s =
Prefetch(file_reader_, offset, n + readahead_size_, for_compaction);
if (!s.ok()) {
return false;
}

11
util/file_reader_writer.h
Unescape View File

@ -158,7 +158,8 @@ class RandomAccessFileReader {
RandomAccessFileReader(const RandomAccessFileReader&) = delete;
RandomAccessFileReader& operator=(const RandomAccessFileReader&) = delete;
Status Read(uint64_t offset, size_t n, Slice* result, char* scratch) const;
Status Read(uint64_t offset, size_t n, Slice* result, char* scratch,
bool for_compaction = false) const;
Status Prefetch(uint64_t offset, size_t n) const {
return file_->Prefetch(offset, n);
@ -343,7 +344,9 @@ class FilePrefetchBuffer {
// reader : the file reader.
// offset : the file offset to start reading from.
// n : the number of bytes to read.
Status Prefetch(RandomAccessFileReader* reader, uint64_t offset, size_t n);
// for_compaction : if prefetch is done for compaction read.
Status Prefetch(RandomAccessFileReader* reader, uint64_t offset, size_t n,
bool for_compaction = false);
// Tries returning the data for a file raed from this buffer, if that data is
// in the buffer.
@ -354,7 +357,9 @@ class FilePrefetchBuffer {
// offset : the file offset.
// n : the number of bytes.
// result : output buffer to put the data into.
bool TryReadFromCache(uint64_t offset, size_t n, Slice* result);
// for_compaction : if cache read is done for compaction read.
bool TryReadFromCache(uint64_t offset, size_t n, Slice* result,
bool for_compaction = false);
// The minimum `offset` ever passed to TryReadFromCache(). This will nly be
// tracked if track_min_offset = true.

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