fork of https://github.com/oxigraph/rocksdb and https://github.com/facebook/rocksdb for nextgraph and oxigraph
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771 lines
25 KiB
771 lines
25 KiB
// Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
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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 "table/plain/plain_table_reader.h"
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#include <string>
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#include <vector>
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#include "db/dbformat.h"
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#include "memory/arena.h"
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#include "monitoring/histogram.h"
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#include "monitoring/perf_context_imp.h"
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#include "rocksdb/cache.h"
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#include "rocksdb/comparator.h"
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#include "rocksdb/env.h"
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#include "rocksdb/filter_policy.h"
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#include "rocksdb/options.h"
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#include "rocksdb/statistics.h"
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#include "table/block_based/block.h"
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#include "table/block_based/filter_block.h"
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#include "table/format.h"
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#include "table/get_context.h"
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#include "table/internal_iterator.h"
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#include "table/meta_blocks.h"
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#include "table/plain/plain_table_bloom.h"
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#include "table/plain/plain_table_factory.h"
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#include "table/plain/plain_table_key_coding.h"
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#include "table/two_level_iterator.h"
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#include "util/coding.h"
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#include "util/dynamic_bloom.h"
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#include "util/hash.h"
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#include "util/stop_watch.h"
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#include "util/string_util.h"
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namespace ROCKSDB_NAMESPACE {
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namespace {
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// Safely getting a uint32_t element from a char array, where, starting from
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// `base`, every 4 bytes are considered as an fixed 32 bit integer.
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inline uint32_t GetFixed32Element(const char* base, size_t offset) {
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return DecodeFixed32(base + offset * sizeof(uint32_t));
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}
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} // namespace
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// Iterator to iterate IndexedTable
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class PlainTableIterator : public InternalIterator {
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public:
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explicit PlainTableIterator(PlainTableReader* table, bool use_prefix_seek);
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// No copying allowed
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PlainTableIterator(const PlainTableIterator&) = delete;
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void operator=(const Iterator&) = delete;
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~PlainTableIterator() override;
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bool Valid() const override;
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void SeekToFirst() override;
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void SeekToLast() override;
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void Seek(const Slice& target) override;
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void SeekForPrev(const Slice& target) override;
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void Next() override;
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void Prev() override;
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Slice key() const override;
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Slice value() const override;
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Status status() const override;
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private:
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PlainTableReader* table_;
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PlainTableKeyDecoder decoder_;
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bool use_prefix_seek_;
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uint32_t offset_;
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uint32_t next_offset_;
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Slice key_;
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Slice value_;
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Status status_;
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};
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extern const uint64_t kPlainTableMagicNumber;
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PlainTableReader::PlainTableReader(
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const ImmutableOptions& ioptions,
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std::unique_ptr<RandomAccessFileReader>&& file,
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const EnvOptions& storage_options, const InternalKeyComparator& icomparator,
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EncodingType encoding_type, uint64_t file_size,
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const TableProperties* table_properties,
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const SliceTransform* prefix_extractor)
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: internal_comparator_(icomparator),
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encoding_type_(encoding_type),
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full_scan_mode_(false),
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user_key_len_(static_cast<uint32_t>(table_properties->fixed_key_len)),
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prefix_extractor_(prefix_extractor),
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enable_bloom_(false),
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bloom_(6),
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file_info_(std::move(file), storage_options,
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static_cast<uint32_t>(table_properties->data_size)),
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ioptions_(ioptions),
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file_size_(file_size),
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table_properties_(nullptr) {}
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PlainTableReader::~PlainTableReader() {
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// Should fix?
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status_.PermitUncheckedError();
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}
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Status PlainTableReader::Open(
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const ImmutableOptions& ioptions, const EnvOptions& env_options,
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const InternalKeyComparator& internal_comparator,
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std::unique_ptr<RandomAccessFileReader>&& file, uint64_t file_size,
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std::unique_ptr<TableReader>* table_reader, const int bloom_bits_per_key,
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double hash_table_ratio, size_t index_sparseness, size_t huge_page_tlb_size,
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bool full_scan_mode, const bool immortal_table,
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const SliceTransform* prefix_extractor) {
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if (file_size > PlainTableIndex::kMaxFileSize) {
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return Status::NotSupported("File is too large for PlainTableReader!");
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}
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std::unique_ptr<TableProperties> props;
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// TODO: plumb Env::IOActivity
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const ReadOptions read_options;
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auto s = ReadTableProperties(file.get(), file_size, kPlainTableMagicNumber,
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ioptions, read_options, &props);
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if (!s.ok()) {
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return s;
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}
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assert(hash_table_ratio >= 0.0);
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auto& user_props = props->user_collected_properties;
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auto prefix_extractor_in_file = props->prefix_extractor_name;
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if (!full_scan_mode &&
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!prefix_extractor_in_file.empty() /* old version sst file*/
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&& prefix_extractor_in_file != "nullptr") {
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if (!prefix_extractor) {
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return Status::InvalidArgument(
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"Prefix extractor is missing when opening a PlainTable built "
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"using a prefix extractor");
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} else if (prefix_extractor_in_file != prefix_extractor->AsString()) {
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return Status::InvalidArgument(
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"Prefix extractor given doesn't match the one used to build "
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"PlainTable");
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}
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}
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EncodingType encoding_type = kPlain;
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auto encoding_type_prop =
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user_props.find(PlainTablePropertyNames::kEncodingType);
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if (encoding_type_prop != user_props.end()) {
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encoding_type = static_cast<EncodingType>(
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DecodeFixed32(encoding_type_prop->second.c_str()));
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}
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std::unique_ptr<PlainTableReader> new_reader(new PlainTableReader(
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ioptions, std::move(file), env_options, internal_comparator,
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encoding_type, file_size, props.get(), prefix_extractor));
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s = new_reader->MmapDataIfNeeded();
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if (!s.ok()) {
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return s;
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}
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if (!full_scan_mode) {
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s = new_reader->PopulateIndex(props.get(), bloom_bits_per_key,
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hash_table_ratio, index_sparseness,
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huge_page_tlb_size);
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if (!s.ok()) {
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return s;
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}
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} else {
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// Flag to indicate it is a full scan mode so that none of the indexes
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// can be used.
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new_reader->full_scan_mode_ = true;
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}
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// PopulateIndex can add to the props, so don't store them until now
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new_reader->table_properties_ = std::move(props);
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if (immortal_table && new_reader->file_info_.is_mmap_mode) {
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new_reader->dummy_cleanable_.reset(new Cleanable());
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}
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*table_reader = std::move(new_reader);
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return s;
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}
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void PlainTableReader::SetupForCompaction() {}
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InternalIterator* PlainTableReader::NewIterator(
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const ReadOptions& options, const SliceTransform* /* prefix_extractor */,
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Arena* arena, bool /*skip_filters*/, TableReaderCaller /*caller*/,
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size_t /*compaction_readahead_size*/, bool /* allow_unprepared_value */) {
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// Not necessarily used here, but make sure this has been initialized
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assert(table_properties_);
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// Auto prefix mode is not implemented in PlainTable.
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bool use_prefix_seek = !IsTotalOrderMode() && !options.total_order_seek &&
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!options.auto_prefix_mode;
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if (arena == nullptr) {
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return new PlainTableIterator(this, use_prefix_seek);
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} else {
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auto mem = arena->AllocateAligned(sizeof(PlainTableIterator));
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return new (mem) PlainTableIterator(this, use_prefix_seek);
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}
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}
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Status PlainTableReader::PopulateIndexRecordList(
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PlainTableIndexBuilder* index_builder,
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std::vector<uint32_t>* prefix_hashes) {
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Slice prev_key_prefix_slice;
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std::string prev_key_prefix_buf;
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uint32_t pos = data_start_offset_;
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bool is_first_record = true;
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Slice key_prefix_slice;
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PlainTableKeyDecoder decoder(&file_info_, encoding_type_, user_key_len_,
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prefix_extractor_);
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while (pos < file_info_.data_end_offset) {
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uint32_t key_offset = pos;
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ParsedInternalKey key;
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Slice value_slice;
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bool seekable = false;
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Status s = Next(&decoder, &pos, &key, nullptr, &value_slice, &seekable);
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if (!s.ok()) {
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return s;
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}
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key_prefix_slice = GetPrefix(key);
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if (enable_bloom_) {
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bloom_.AddHash(GetSliceHash(key.user_key));
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} else {
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if (is_first_record || prev_key_prefix_slice != key_prefix_slice) {
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if (!is_first_record) {
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prefix_hashes->push_back(GetSliceHash(prev_key_prefix_slice));
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}
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if (file_info_.is_mmap_mode) {
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prev_key_prefix_slice = key_prefix_slice;
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} else {
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prev_key_prefix_buf = key_prefix_slice.ToString();
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prev_key_prefix_slice = prev_key_prefix_buf;
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}
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}
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}
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index_builder->AddKeyPrefix(GetPrefix(key), key_offset);
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if (!seekable && is_first_record) {
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return Status::Corruption("Key for a prefix is not seekable");
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}
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is_first_record = false;
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}
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prefix_hashes->push_back(GetSliceHash(key_prefix_slice));
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auto s = index_.InitFromRawData(index_builder->Finish());
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return s;
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}
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void PlainTableReader::AllocateBloom(int bloom_bits_per_key, int num_keys,
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size_t huge_page_tlb_size) {
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uint32_t bloom_total_bits = num_keys * bloom_bits_per_key;
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if (bloom_total_bits > 0) {
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enable_bloom_ = true;
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bloom_.SetTotalBits(&arena_, bloom_total_bits, ioptions_.bloom_locality,
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huge_page_tlb_size, ioptions_.logger);
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}
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}
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void PlainTableReader::FillBloom(const std::vector<uint32_t>& prefix_hashes) {
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assert(bloom_.IsInitialized());
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for (const auto prefix_hash : prefix_hashes) {
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bloom_.AddHash(prefix_hash);
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}
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}
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Status PlainTableReader::MmapDataIfNeeded() {
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if (file_info_.is_mmap_mode) {
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// Get mmapped memory.
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return file_info_.file->Read(
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IOOptions(), 0, static_cast<size_t>(file_size_), &file_info_.file_data,
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nullptr, nullptr, Env::IO_TOTAL /* rate_limiter_priority */);
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}
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return Status::OK();
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}
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Status PlainTableReader::PopulateIndex(TableProperties* props,
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int bloom_bits_per_key,
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double hash_table_ratio,
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size_t index_sparseness,
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size_t huge_page_tlb_size) {
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assert(props != nullptr);
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BlockContents index_block_contents;
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// TODO: plumb Env::IOActivity
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const ReadOptions read_options;
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Status s =
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ReadMetaBlock(file_info_.file.get(), nullptr /* prefetch_buffer */,
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file_size_, kPlainTableMagicNumber, ioptions_, read_options,
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PlainTableIndexBuilder::kPlainTableIndexBlock,
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BlockType::kIndex, &index_block_contents);
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bool index_in_file = s.ok();
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BlockContents bloom_block_contents;
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bool bloom_in_file = false;
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// We only need to read the bloom block if index block is in file.
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if (index_in_file) {
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s = ReadMetaBlock(file_info_.file.get(), nullptr /* prefetch_buffer */,
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file_size_, kPlainTableMagicNumber, ioptions_,
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read_options, BloomBlockBuilder::kBloomBlock,
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BlockType::kFilter, &bloom_block_contents);
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bloom_in_file = s.ok() && bloom_block_contents.data.size() > 0;
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}
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Slice* bloom_block;
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if (bloom_in_file) {
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// If bloom_block_contents.allocation is not empty (which will be the case
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// for non-mmap mode), it holds the alloated memory for the bloom block.
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// It needs to be kept alive to keep `bloom_block` valid.
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bloom_block_alloc_ = std::move(bloom_block_contents.allocation);
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bloom_block = &bloom_block_contents.data;
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} else {
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bloom_block = nullptr;
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}
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Slice* index_block;
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if (index_in_file) {
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// If index_block_contents.allocation is not empty (which will be the case
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// for non-mmap mode), it holds the alloated memory for the index block.
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// It needs to be kept alive to keep `index_block` valid.
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index_block_alloc_ = std::move(index_block_contents.allocation);
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index_block = &index_block_contents.data;
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} else {
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index_block = nullptr;
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}
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if ((prefix_extractor_ == nullptr) && (hash_table_ratio != 0)) {
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// moptions.prefix_extractor is requried for a hash-based look-up.
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return Status::NotSupported(
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"PlainTable requires a prefix extractor enable prefix hash mode.");
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}
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// First, read the whole file, for every kIndexIntervalForSamePrefixKeys rows
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// for a prefix (starting from the first one), generate a record of (hash,
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// offset) and append it to IndexRecordList, which is a data structure created
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// to store them.
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if (!index_in_file) {
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// Allocate bloom filter here for total order mode.
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if (IsTotalOrderMode()) {
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AllocateBloom(bloom_bits_per_key,
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static_cast<uint32_t>(props->num_entries),
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huge_page_tlb_size);
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}
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} else if (bloom_in_file) {
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enable_bloom_ = true;
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auto num_blocks_property = props->user_collected_properties.find(
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PlainTablePropertyNames::kNumBloomBlocks);
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uint32_t num_blocks = 0;
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if (num_blocks_property != props->user_collected_properties.end()) {
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Slice temp_slice(num_blocks_property->second);
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if (!GetVarint32(&temp_slice, &num_blocks)) {
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num_blocks = 0;
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}
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}
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// cast away const qualifier, because bloom_ won't be changed
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bloom_.SetRawData(const_cast<char*>(bloom_block->data()),
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static_cast<uint32_t>(bloom_block->size()) * 8,
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num_blocks);
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} else {
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// Index in file but no bloom in file. Disable bloom filter in this case.
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enable_bloom_ = false;
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bloom_bits_per_key = 0;
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}
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PlainTableIndexBuilder index_builder(&arena_, ioptions_, prefix_extractor_,
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index_sparseness, hash_table_ratio,
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huge_page_tlb_size);
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std::vector<uint32_t> prefix_hashes;
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if (!index_in_file) {
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// Populates _bloom if enabled (total order mode)
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s = PopulateIndexRecordList(&index_builder, &prefix_hashes);
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if (!s.ok()) {
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return s;
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}
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} else {
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s = index_.InitFromRawData(*index_block);
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if (!s.ok()) {
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return s;
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}
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}
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if (!index_in_file) {
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if (!IsTotalOrderMode()) {
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// Calculated bloom filter size and allocate memory for
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// bloom filter based on the number of prefixes, then fill it.
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AllocateBloom(bloom_bits_per_key, index_.GetNumPrefixes(),
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huge_page_tlb_size);
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if (enable_bloom_) {
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FillBloom(prefix_hashes);
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}
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}
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}
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// Fill two table properties.
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if (!index_in_file) {
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props->user_collected_properties["plain_table_hash_table_size"] =
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std::to_string(index_.GetIndexSize() * PlainTableIndex::kOffsetLen);
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props->user_collected_properties["plain_table_sub_index_size"] =
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std::to_string(index_.GetSubIndexSize());
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} else {
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props->user_collected_properties["plain_table_hash_table_size"] =
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std::to_string(0);
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props->user_collected_properties["plain_table_sub_index_size"] =
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std::to_string(0);
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}
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return Status::OK();
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}
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Status PlainTableReader::GetOffset(PlainTableKeyDecoder* decoder,
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const Slice& target, const Slice& prefix,
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uint32_t prefix_hash, bool& prefix_matched,
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uint32_t* offset) const {
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prefix_matched = false;
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uint32_t prefix_index_offset;
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auto res = index_.GetOffset(prefix_hash, &prefix_index_offset);
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if (res == PlainTableIndex::kNoPrefixForBucket) {
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*offset = file_info_.data_end_offset;
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return Status::OK();
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} else if (res == PlainTableIndex::kDirectToFile) {
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*offset = prefix_index_offset;
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return Status::OK();
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}
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// point to sub-index, need to do a binary search
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uint32_t upper_bound = 0;
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const char* base_ptr =
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index_.GetSubIndexBasePtrAndUpperBound(prefix_index_offset, &upper_bound);
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uint32_t low = 0;
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uint32_t high = upper_bound;
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ParsedInternalKey mid_key;
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ParsedInternalKey parsed_target;
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Status s = ParseInternalKey(target, &parsed_target,
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false /* log_err_key */); // TODO
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if (!s.ok()) return s;
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// The key is between [low, high). Do a binary search between it.
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while (high - low > 1) {
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uint32_t mid = (high + low) / 2;
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uint32_t file_offset = GetFixed32Element(base_ptr, mid);
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uint32_t tmp;
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s = decoder->NextKeyNoValue(file_offset, &mid_key, nullptr, &tmp);
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if (!s.ok()) {
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return s;
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}
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int cmp_result = internal_comparator_.Compare(mid_key, parsed_target);
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if (cmp_result < 0) {
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low = mid;
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} else {
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if (cmp_result == 0) {
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// Happen to have found the exact key or target is smaller than the
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// first key after base_offset.
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prefix_matched = true;
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*offset = file_offset;
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return Status::OK();
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} else {
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high = mid;
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}
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}
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|
}
|
|
// Both of the key at the position low or low+1 could share the same
|
|
// prefix as target. We need to rule out one of them to avoid to go
|
|
// to the wrong prefix.
|
|
ParsedInternalKey low_key;
|
|
uint32_t tmp;
|
|
uint32_t low_key_offset = GetFixed32Element(base_ptr, low);
|
|
s = decoder->NextKeyNoValue(low_key_offset, &low_key, nullptr, &tmp);
|
|
if (!s.ok()) {
|
|
return s;
|
|
}
|
|
|
|
if (GetPrefix(low_key) == prefix) {
|
|
prefix_matched = true;
|
|
*offset = low_key_offset;
|
|
} else if (low + 1 < upper_bound) {
|
|
// There is possible a next prefix, return it
|
|
prefix_matched = false;
|
|
*offset = GetFixed32Element(base_ptr, low + 1);
|
|
} else {
|
|
// target is larger than a key of the last prefix in this bucket
|
|
// but with a different prefix. Key does not exist.
|
|
*offset = file_info_.data_end_offset;
|
|
}
|
|
return Status::OK();
|
|
}
|
|
|
|
bool PlainTableReader::MatchBloom(uint32_t hash) const {
|
|
if (!enable_bloom_) {
|
|
return true;
|
|
}
|
|
|
|
if (bloom_.MayContainHash(hash)) {
|
|
PERF_COUNTER_ADD(bloom_sst_hit_count, 1);
|
|
return true;
|
|
} else {
|
|
PERF_COUNTER_ADD(bloom_sst_miss_count, 1);
|
|
return false;
|
|
}
|
|
}
|
|
|
|
Status PlainTableReader::Next(PlainTableKeyDecoder* decoder, uint32_t* offset,
|
|
ParsedInternalKey* parsed_key,
|
|
Slice* internal_key, Slice* value,
|
|
bool* seekable) const {
|
|
if (*offset == file_info_.data_end_offset) {
|
|
*offset = file_info_.data_end_offset;
|
|
return Status::OK();
|
|
}
|
|
|
|
if (*offset > file_info_.data_end_offset) {
|
|
return Status::Corruption("Offset is out of file size");
|
|
}
|
|
|
|
uint32_t bytes_read;
|
|
Status s = decoder->NextKey(*offset, parsed_key, internal_key, value,
|
|
&bytes_read, seekable);
|
|
if (!s.ok()) {
|
|
return s;
|
|
}
|
|
*offset = *offset + bytes_read;
|
|
return Status::OK();
|
|
}
|
|
|
|
void PlainTableReader::Prepare(const Slice& target) {
|
|
if (enable_bloom_) {
|
|
uint32_t prefix_hash = GetSliceHash(GetPrefix(target));
|
|
bloom_.Prefetch(prefix_hash);
|
|
}
|
|
}
|
|
|
|
Status PlainTableReader::Get(const ReadOptions& /*ro*/, const Slice& target,
|
|
GetContext* get_context,
|
|
const SliceTransform* /* prefix_extractor */,
|
|
bool /*skip_filters*/) {
|
|
// Check bloom filter first.
|
|
Slice prefix_slice;
|
|
uint32_t prefix_hash;
|
|
if (IsTotalOrderMode()) {
|
|
if (full_scan_mode_) {
|
|
status_ =
|
|
Status::InvalidArgument("Get() is not allowed in full scan mode.");
|
|
}
|
|
// Match whole user key for bloom filter check.
|
|
if (!MatchBloom(GetSliceHash(ExtractUserKey(target)))) {
|
|
return Status::OK();
|
|
}
|
|
// in total order mode, there is only one bucket 0, and we always use empty
|
|
// prefix.
|
|
prefix_slice = Slice();
|
|
prefix_hash = 0;
|
|
} else {
|
|
prefix_slice = GetPrefix(target);
|
|
prefix_hash = GetSliceHash(prefix_slice);
|
|
if (!MatchBloom(prefix_hash)) {
|
|
return Status::OK();
|
|
}
|
|
}
|
|
uint32_t offset;
|
|
bool prefix_match;
|
|
PlainTableKeyDecoder decoder(&file_info_, encoding_type_, user_key_len_,
|
|
prefix_extractor_);
|
|
Status s = GetOffset(&decoder, target, prefix_slice, prefix_hash,
|
|
prefix_match, &offset);
|
|
|
|
if (!s.ok()) {
|
|
return s;
|
|
}
|
|
ParsedInternalKey found_key;
|
|
ParsedInternalKey parsed_target;
|
|
s = ParseInternalKey(target, &parsed_target,
|
|
false /* log_err_key */); // TODO
|
|
if (!s.ok()) return s;
|
|
|
|
Slice found_value;
|
|
while (offset < file_info_.data_end_offset) {
|
|
s = Next(&decoder, &offset, &found_key, nullptr, &found_value);
|
|
if (!s.ok()) {
|
|
return s;
|
|
}
|
|
if (!prefix_match) {
|
|
// Need to verify prefix for the first key found if it is not yet
|
|
// checked.
|
|
if (GetPrefix(found_key) != prefix_slice) {
|
|
return Status::OK();
|
|
}
|
|
prefix_match = true;
|
|
}
|
|
// TODO(ljin): since we know the key comparison result here,
|
|
// can we enable the fast path?
|
|
if (internal_comparator_.Compare(found_key, parsed_target) >= 0) {
|
|
bool dont_care __attribute__((__unused__));
|
|
if (!get_context->SaveValue(found_key, found_value, &dont_care,
|
|
dummy_cleanable_.get())) {
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
return Status::OK();
|
|
}
|
|
|
|
uint64_t PlainTableReader::ApproximateOffsetOf(
|
|
const ReadOptions& /*read_options*/, const Slice& /*key*/,
|
|
TableReaderCaller /*caller*/) {
|
|
return 0;
|
|
}
|
|
|
|
uint64_t PlainTableReader::ApproximateSize(const ReadOptions& /* read_options*/,
|
|
const Slice& /*start*/,
|
|
const Slice& /*end*/,
|
|
TableReaderCaller /*caller*/) {
|
|
return 0;
|
|
}
|
|
|
|
PlainTableIterator::PlainTableIterator(PlainTableReader* table,
|
|
bool use_prefix_seek)
|
|
: table_(table),
|
|
decoder_(&table_->file_info_, table_->encoding_type_,
|
|
table_->user_key_len_, table_->prefix_extractor_),
|
|
use_prefix_seek_(use_prefix_seek) {
|
|
next_offset_ = offset_ = table_->file_info_.data_end_offset;
|
|
}
|
|
|
|
PlainTableIterator::~PlainTableIterator() {}
|
|
|
|
bool PlainTableIterator::Valid() const {
|
|
return offset_ < table_->file_info_.data_end_offset &&
|
|
offset_ >= table_->data_start_offset_;
|
|
}
|
|
|
|
void PlainTableIterator::SeekToFirst() {
|
|
status_ = Status::OK();
|
|
next_offset_ = table_->data_start_offset_;
|
|
if (next_offset_ >= table_->file_info_.data_end_offset) {
|
|
next_offset_ = offset_ = table_->file_info_.data_end_offset;
|
|
} else {
|
|
Next();
|
|
}
|
|
}
|
|
|
|
void PlainTableIterator::SeekToLast() {
|
|
assert(false);
|
|
status_ = Status::NotSupported("SeekToLast() is not supported in PlainTable");
|
|
next_offset_ = offset_ = table_->file_info_.data_end_offset;
|
|
}
|
|
|
|
void PlainTableIterator::Seek(const Slice& target) {
|
|
if (use_prefix_seek_ != !table_->IsTotalOrderMode()) {
|
|
// This check is done here instead of NewIterator() to permit creating an
|
|
// iterator with total_order_seek = true even if we won't be able to Seek()
|
|
// it. This is needed for compaction: it creates iterator with
|
|
// total_order_seek = true but usually never does Seek() on it,
|
|
// only SeekToFirst().
|
|
status_ = Status::InvalidArgument(
|
|
"total_order_seek not implemented for PlainTable.");
|
|
offset_ = next_offset_ = table_->file_info_.data_end_offset;
|
|
return;
|
|
}
|
|
|
|
// If the user doesn't set prefix seek option and we are not able to do a
|
|
// total Seek(). assert failure.
|
|
if (table_->IsTotalOrderMode()) {
|
|
if (table_->full_scan_mode_) {
|
|
status_ =
|
|
Status::InvalidArgument("Seek() is not allowed in full scan mode.");
|
|
offset_ = next_offset_ = table_->file_info_.data_end_offset;
|
|
return;
|
|
} else if (table_->GetIndexSize() > 1) {
|
|
assert(false);
|
|
status_ = Status::NotSupported(
|
|
"PlainTable cannot issue non-prefix seek unless in total order "
|
|
"mode.");
|
|
offset_ = next_offset_ = table_->file_info_.data_end_offset;
|
|
return;
|
|
}
|
|
}
|
|
|
|
Slice prefix_slice = table_->GetPrefix(target);
|
|
uint32_t prefix_hash = 0;
|
|
// Bloom filter is ignored in total-order mode.
|
|
if (!table_->IsTotalOrderMode()) {
|
|
prefix_hash = GetSliceHash(prefix_slice);
|
|
if (!table_->MatchBloom(prefix_hash)) {
|
|
status_ = Status::OK();
|
|
offset_ = next_offset_ = table_->file_info_.data_end_offset;
|
|
return;
|
|
}
|
|
}
|
|
bool prefix_match;
|
|
status_ = table_->GetOffset(&decoder_, target, prefix_slice, prefix_hash,
|
|
prefix_match, &next_offset_);
|
|
if (!status_.ok()) {
|
|
offset_ = next_offset_ = table_->file_info_.data_end_offset;
|
|
return;
|
|
}
|
|
|
|
if (next_offset_ < table_->file_info_.data_end_offset) {
|
|
for (Next(); status_.ok() && Valid(); Next()) {
|
|
if (!prefix_match) {
|
|
// Need to verify the first key's prefix
|
|
if (table_->GetPrefix(key()) != prefix_slice) {
|
|
offset_ = next_offset_ = table_->file_info_.data_end_offset;
|
|
break;
|
|
}
|
|
prefix_match = true;
|
|
}
|
|
if (table_->internal_comparator_.Compare(key(), target) >= 0) {
|
|
break;
|
|
}
|
|
}
|
|
} else {
|
|
offset_ = table_->file_info_.data_end_offset;
|
|
}
|
|
}
|
|
|
|
void PlainTableIterator::SeekForPrev(const Slice& /*target*/) {
|
|
assert(false);
|
|
status_ =
|
|
Status::NotSupported("SeekForPrev() is not supported in PlainTable");
|
|
offset_ = next_offset_ = table_->file_info_.data_end_offset;
|
|
}
|
|
|
|
void PlainTableIterator::Next() {
|
|
offset_ = next_offset_;
|
|
if (offset_ < table_->file_info_.data_end_offset) {
|
|
Slice tmp_slice;
|
|
ParsedInternalKey parsed_key;
|
|
status_ =
|
|
table_->Next(&decoder_, &next_offset_, &parsed_key, &key_, &value_);
|
|
if (!status_.ok()) {
|
|
offset_ = next_offset_ = table_->file_info_.data_end_offset;
|
|
}
|
|
}
|
|
}
|
|
|
|
void PlainTableIterator::Prev() { assert(false); }
|
|
|
|
Slice PlainTableIterator::key() const {
|
|
assert(Valid());
|
|
return key_;
|
|
}
|
|
|
|
Slice PlainTableIterator::value() const {
|
|
assert(Valid());
|
|
return value_;
|
|
}
|
|
|
|
Status PlainTableIterator::status() const { return status_; }
|
|
|
|
} // namespace ROCKSDB_NAMESPACE
|
|
|