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229297d1b8
Summary: A second attempt after https://github.com/facebook/rocksdb/issues/10802, with bug fixes and refactoring. This PR updates compaction logic to take range tombstones into account when determining whether to cut the current compaction output file (https://github.com/facebook/rocksdb/issues/4811). Before this change, only point keys were considered, and range tombstones could cause large compactions. For example, if the current compaction outputs is a range tombstone [a, b) and 2 point keys y, z, they would be added to the same file, and may overlap with too many files in the next level and cause a large compaction in the future. This PR also includes ajkr's effort to simplify the logic to add range tombstones to compaction output files in `AddRangeDels()` ([https://github.com/facebook/rocksdb/issues/11078](https://github.com/facebook/rocksdb/pull/11078#issuecomment-1386078861)). The main change is for `CompactionIterator` to emit range tombstone start keys to be processed by `CompactionOutputs`. A new class `CompactionMergingIterator` is introduced to replace `MergingIterator` under `CompactionIterator` to enable emitting of range tombstone start keys. Further improvement after this PR include cutting compaction output at some grandparent boundary key (instead of the next output key) when cutting within a range tombstone to reduce overlap with grandparents. Pull Request resolved: https://github.com/facebook/rocksdb/pull/11113 Test Plan: * added unit test in db_range_del_test * crash test with a small key range: `python3 tools/db_crashtest.py blackbox --simple --max_key=100 --interval=600 --write_buffer_size=262144 --target_file_size_base=256 --max_bytes_for_level_base=262144 --block_size=128 --value_size_mult=33 --subcompactions=10 --use_multiget=1 --delpercent=3 --delrangepercent=2 --verify_iterator_with_expected_state_one_in=2 --num_iterations=10` Reviewed By: ajkr Differential Revision: D42655709 Pulled By: cbi42 fbshipit-source-id: 8367e36ef5640e8f21c14a3855d4a8d6e360a34c
96 lines
2.3 KiB
C++
96 lines
2.3 KiB
C++
// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
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// This source code is licensed under both the GPLv2 (found in the
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// COPYING file in the root directory) and Apache 2.0 License
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// (found in the LICENSE.Apache file in the root directory).
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#pragma once
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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 "rocksdb/iterator.h"
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#include "rocksdb/slice.h"
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#include "table/internal_iterator.h"
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namespace ROCKSDB_NAMESPACE {
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class HistoryTrimmingIterator : public InternalIterator {
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public:
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explicit HistoryTrimmingIterator(InternalIterator* input,
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const Comparator* cmp, const std::string& ts)
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: input_(input), filter_ts_(ts), cmp_(cmp) {
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assert(cmp_->timestamp_size() > 0 && !ts.empty());
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}
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bool filter() const {
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if (!input_->Valid()) {
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return true;
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}
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Slice current_ts = ExtractTimestampFromKey(key(), cmp_->timestamp_size());
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return cmp_->CompareTimestamp(current_ts, Slice(filter_ts_)) <= 0;
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}
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bool Valid() const override { return input_->Valid(); }
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void SeekToFirst() override {
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input_->SeekToFirst();
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while (!filter()) {
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input_->Next();
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}
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}
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void SeekToLast() override {
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input_->SeekToLast();
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while (!filter()) {
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input_->Prev();
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}
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}
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void Seek(const Slice& target) override {
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input_->Seek(target);
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while (!filter()) {
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input_->Next();
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}
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}
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void SeekForPrev(const Slice& target) override {
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input_->SeekForPrev(target);
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while (!filter()) {
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input_->Prev();
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}
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}
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void Next() override {
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do {
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input_->Next();
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} while (!filter());
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}
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void Prev() override {
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do {
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input_->Prev();
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} while (!filter());
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}
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Slice key() const override { return input_->key(); }
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Slice value() const override { return input_->value(); }
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Status status() const override { return input_->status(); }
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bool IsKeyPinned() const override { return input_->IsKeyPinned(); }
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bool IsValuePinned() const override { return input_->IsValuePinned(); }
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bool IsDeleteRangeSentinelKey() const override {
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return input_->IsDeleteRangeSentinelKey();
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}
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private:
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InternalIterator* input_;
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const std::string filter_ts_;
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const Comparator* const cmp_;
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};
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} // namespace ROCKSDB_NAMESPACE
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