fork of https://github.com/oxigraph/rocksdb and https://github.com/facebook/rocksdb for nextgraph and oxigraph
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337 lines
12 KiB
337 lines
12 KiB
// Copyright (c) 2013, Facebook, Inc. All rights reserved.
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// This source code is licensed under the BSD-style license found in the
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// LICENSE file in the root directory of this source tree. An additional grant
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// of patent rights can be found in the PATENTS file in the same directory.
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//
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// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file. See the AUTHORS file for names of contributors.
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#include "db/table_cache.h"
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#include "db/dbformat.h"
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#include "db/filename.h"
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#include "db/version_edit.h"
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#include "rocksdb/statistics.h"
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#include "table/iterator_wrapper.h"
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#include "table/table_reader.h"
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#include "table/get_context.h"
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#include "util/coding.h"
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#include "util/file_reader_writer.h"
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#include "util/perf_context_imp.h"
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#include "util/stop_watch.h"
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#include "util/sync_point.h"
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namespace rocksdb {
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namespace {
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template <class T>
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static void DeleteEntry(const Slice& key, void* value) {
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T* typed_value = reinterpret_cast<T*>(value);
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delete typed_value;
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}
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static void UnrefEntry(void* arg1, void* arg2) {
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Cache* cache = reinterpret_cast<Cache*>(arg1);
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Cache::Handle* h = reinterpret_cast<Cache::Handle*>(arg2);
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cache->Release(h);
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}
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static void DeleteTableReader(void* arg1, void* arg2) {
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TableReader* table_reader = reinterpret_cast<TableReader*>(arg1);
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delete table_reader;
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}
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static Slice GetSliceForFileNumber(const uint64_t* file_number) {
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return Slice(reinterpret_cast<const char*>(file_number),
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sizeof(*file_number));
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}
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#ifndef ROCKSDB_LITE
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void AppendVarint64(IterKey* key, uint64_t v) {
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char buf[10];
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auto ptr = EncodeVarint64(buf, v);
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key->TrimAppend(key->Size(), buf, ptr - buf);
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}
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#endif // ROCKSDB_LITE
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} // namespace
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TableCache::TableCache(const ImmutableCFOptions& ioptions,
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const EnvOptions& env_options, Cache* const cache)
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: ioptions_(ioptions), env_options_(env_options), cache_(cache) {
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if (ioptions_.row_cache) {
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// If the same cache is shared by multiple instances, we need to
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// disambiguate its entries.
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PutVarint64(&row_cache_id_, ioptions_.row_cache->NewId());
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}
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}
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TableCache::~TableCache() {
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}
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TableReader* TableCache::GetTableReaderFromHandle(Cache::Handle* handle) {
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return reinterpret_cast<TableReader*>(cache_->Value(handle));
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}
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void TableCache::ReleaseHandle(Cache::Handle* handle) {
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cache_->Release(handle);
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}
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Status TableCache::GetTableReader(
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const EnvOptions& env_options,
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const InternalKeyComparator& internal_comparator, const FileDescriptor& fd,
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bool advise_random_on_open, bool record_read_stats,
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HistogramImpl* file_read_hist, unique_ptr<TableReader>* table_reader) {
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std::string fname =
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TableFileName(ioptions_.db_paths, fd.GetNumber(), fd.GetPathId());
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unique_ptr<RandomAccessFile> file;
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Status s = ioptions_.env->NewRandomAccessFile(fname, &file, env_options);
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RecordTick(ioptions_.statistics, NO_FILE_OPENS);
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if (s.ok()) {
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if (advise_random_on_open) {
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file->Hint(RandomAccessFile::RANDOM);
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}
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StopWatch sw(ioptions_.env, ioptions_.statistics, TABLE_OPEN_IO_MICROS);
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std::unique_ptr<RandomAccessFileReader> file_reader(
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new RandomAccessFileReader(std::move(file), ioptions_.env,
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ioptions_.statistics, record_read_stats,
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file_read_hist));
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s = ioptions_.table_factory->NewTableReader(
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ioptions_, env_options, internal_comparator, std::move(file_reader),
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fd.GetFileSize(), table_reader);
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TEST_SYNC_POINT("TableCache::GetTableReader:0");
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}
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return s;
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}
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Status TableCache::FindTable(const EnvOptions& env_options,
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const InternalKeyComparator& internal_comparator,
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const FileDescriptor& fd, Cache::Handle** handle,
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const bool no_io, bool record_read_stats,
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HistogramImpl* file_read_hist) {
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PERF_TIMER_GUARD(find_table_nanos);
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Status s;
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uint64_t number = fd.GetNumber();
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Slice key = GetSliceForFileNumber(&number);
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*handle = cache_->Lookup(key);
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TEST_SYNC_POINT_CALLBACK("TableCache::FindTable:0",
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const_cast<bool*>(&no_io));
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if (*handle == nullptr) {
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if (no_io) { // Dont do IO and return a not-found status
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return Status::Incomplete("Table not found in table_cache, no_io is set");
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}
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unique_ptr<TableReader> table_reader;
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s = GetTableReader(env_options, internal_comparator, fd,
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ioptions_.advise_random_on_open, record_read_stats,
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file_read_hist, &table_reader);
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if (!s.ok()) {
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assert(table_reader == nullptr);
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RecordTick(ioptions_.statistics, NO_FILE_ERRORS);
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// We do not cache error results so that if the error is transient,
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// or somebody repairs the file, we recover automatically.
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} else {
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*handle = cache_->Insert(key, table_reader.release(), 1,
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&DeleteEntry<TableReader>);
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}
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}
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return s;
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}
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Iterator* TableCache::NewIterator(const ReadOptions& options,
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const EnvOptions& env_options,
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const InternalKeyComparator& icomparator,
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const FileDescriptor& fd,
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TableReader** table_reader_ptr,
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HistogramImpl* file_read_hist,
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bool for_compaction, Arena* arena) {
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PERF_TIMER_GUARD(new_table_iterator_nanos);
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if (table_reader_ptr != nullptr) {
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*table_reader_ptr = nullptr;
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}
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TableReader* table_reader = nullptr;
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Cache::Handle* handle = nullptr;
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bool create_new_table_reader =
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(for_compaction && ioptions_.new_table_reader_for_compaction_inputs);
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if (create_new_table_reader) {
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unique_ptr<TableReader> table_reader_unique_ptr;
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Status s = GetTableReader(env_options, icomparator, fd, false, false,
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nullptr, &table_reader_unique_ptr);
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if (!s.ok()) {
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return NewErrorIterator(s, arena);
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}
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table_reader = table_reader_unique_ptr.release();
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} else {
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table_reader = fd.table_reader;
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if (table_reader == nullptr) {
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Status s = FindTable(env_options, icomparator, fd, &handle,
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options.read_tier == kBlockCacheTier,
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!for_compaction, file_read_hist);
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if (!s.ok()) {
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return NewErrorIterator(s, arena);
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}
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table_reader = GetTableReaderFromHandle(handle);
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}
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}
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Iterator* result = table_reader->NewIterator(options, arena);
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if (create_new_table_reader) {
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assert(handle == nullptr);
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result->RegisterCleanup(&DeleteTableReader, table_reader, nullptr);
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} else if (handle != nullptr) {
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result->RegisterCleanup(&UnrefEntry, cache_, handle);
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}
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if (for_compaction) {
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table_reader->SetupForCompaction();
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}
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if (table_reader_ptr != nullptr) {
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*table_reader_ptr = table_reader;
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}
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return result;
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}
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Status TableCache::Get(const ReadOptions& options,
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const InternalKeyComparator& internal_comparator,
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const FileDescriptor& fd, const Slice& k,
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GetContext* get_context, HistogramImpl* file_read_hist) {
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TableReader* t = fd.table_reader;
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Status s;
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Cache::Handle* handle = nullptr;
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std::string* row_cache_entry = nullptr;
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#ifndef ROCKSDB_LITE
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IterKey row_cache_key;
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std::string row_cache_entry_buffer;
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if (ioptions_.row_cache) {
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uint64_t fd_number = fd.GetNumber();
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auto user_key = ExtractUserKey(k);
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// We use the user key as cache key instead of the internal key,
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// otherwise the whole cache would be invalidated every time the
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// sequence key increases. However, to support caching snapshot
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// reads, we append the sequence number (incremented by 1 to
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// distinguish from 0) only in this case.
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uint64_t seq_no =
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options.snapshot == nullptr ? 0 : 1 + GetInternalKeySeqno(k);
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// Compute row cache key.
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row_cache_key.TrimAppend(row_cache_key.Size(), row_cache_id_.data(),
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row_cache_id_.size());
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AppendVarint64(&row_cache_key, fd_number);
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AppendVarint64(&row_cache_key, seq_no);
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row_cache_key.TrimAppend(row_cache_key.Size(), user_key.data(),
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user_key.size());
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if (auto row_handle = ioptions_.row_cache->Lookup(row_cache_key.GetKey())) {
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auto found_row_cache_entry = static_cast<const std::string*>(
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ioptions_.row_cache->Value(row_handle));
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replayGetContextLog(*found_row_cache_entry, user_key, get_context);
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ioptions_.row_cache->Release(row_handle);
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RecordTick(ioptions_.statistics, ROW_CACHE_HIT);
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return Status::OK();
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}
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// Not found, setting up the replay log.
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RecordTick(ioptions_.statistics, ROW_CACHE_MISS);
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row_cache_entry = &row_cache_entry_buffer;
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}
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#endif // ROCKSDB_LITE
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if (!t) {
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s = FindTable(env_options_, internal_comparator, fd, &handle,
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options.read_tier == kBlockCacheTier, file_read_hist);
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if (s.ok()) {
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t = GetTableReaderFromHandle(handle);
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}
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}
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if (s.ok()) {
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get_context->SetReplayLog(row_cache_entry); // nullptr if no cache.
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s = t->Get(options, k, get_context);
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get_context->SetReplayLog(nullptr);
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if (handle != nullptr) {
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ReleaseHandle(handle);
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}
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} else if (options.read_tier && s.IsIncomplete()) {
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// Couldn't find Table in cache but treat as kFound if no_io set
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get_context->MarkKeyMayExist();
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return Status::OK();
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}
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#ifndef ROCKSDB_LITE
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// Put the replay log in row cache only if something was found.
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if (s.ok() && row_cache_entry && !row_cache_entry->empty()) {
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size_t charge =
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row_cache_key.Size() + row_cache_entry->size() + sizeof(std::string);
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void* row_ptr = new std::string(std::move(*row_cache_entry));
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auto row_handle = ioptions_.row_cache->Insert(
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row_cache_key.GetKey(), row_ptr, charge, &DeleteEntry<std::string>);
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ioptions_.row_cache->Release(row_handle);
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}
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#endif // ROCKSDB_LITE
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return s;
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}
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Status TableCache::GetTableProperties(
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const EnvOptions& env_options,
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const InternalKeyComparator& internal_comparator, const FileDescriptor& fd,
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std::shared_ptr<const TableProperties>* properties, bool no_io) {
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Status s;
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auto table_reader = fd.table_reader;
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// table already been pre-loaded?
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if (table_reader) {
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*properties = table_reader->GetTableProperties();
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return s;
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}
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Cache::Handle* table_handle = nullptr;
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s = FindTable(env_options, internal_comparator, fd, &table_handle, no_io);
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if (!s.ok()) {
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return s;
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}
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assert(table_handle);
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auto table = GetTableReaderFromHandle(table_handle);
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*properties = table->GetTableProperties();
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ReleaseHandle(table_handle);
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return s;
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}
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size_t TableCache::GetMemoryUsageByTableReader(
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const EnvOptions& env_options,
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const InternalKeyComparator& internal_comparator,
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const FileDescriptor& fd) {
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Status s;
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auto table_reader = fd.table_reader;
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// table already been pre-loaded?
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if (table_reader) {
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return table_reader->ApproximateMemoryUsage();
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}
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Cache::Handle* table_handle = nullptr;
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s = FindTable(env_options, internal_comparator, fd, &table_handle, true);
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if (!s.ok()) {
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return 0;
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}
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assert(table_handle);
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auto table = GetTableReaderFromHandle(table_handle);
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auto ret = table->ApproximateMemoryUsage();
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ReleaseHandle(table_handle);
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return ret;
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}
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void TableCache::Evict(Cache* cache, uint64_t file_number) {
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cache->Erase(GetSliceForFileNumber(&file_number));
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}
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} // namespace rocksdb
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