mirror of
https://github.com/facebook/rocksdb.git
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6df589b446
Summary: It is experimental. Allow users to return from a call back function TablePropertiesCollector::NeedCompact(), based on the data in the file. It can be used to allow users to suggest DB to clear up delete tombstones faster. Test Plan: Add a unit test. Reviewers: igor, yhchiang, kradhakrishnan, rven Reviewed By: rven Subscribers: yoshinorim, MarkCallaghan, maykov, leveldb, dhruba Differential Revision: https://reviews.facebook.net/D39585
131 lines
4 KiB
C++
131 lines
4 KiB
C++
// 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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// This file defines a collection of statistics collectors.
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#pragma once
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#include "rocksdb/table_properties.h"
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#include <memory>
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#include <string>
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#include <vector>
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namespace rocksdb {
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struct InternalKeyTablePropertiesNames {
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static const std::string kDeletedKeys;
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};
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// Base class for internal table properties collector.
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class IntTblPropCollector {
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public:
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virtual ~IntTblPropCollector() {}
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virtual Status Finish(UserCollectedProperties* properties) = 0;
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virtual const char* Name() const = 0;
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// @params key the user key that is inserted into the table.
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// @params value the value that is inserted into the table.
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virtual Status InternalAdd(const Slice& key, const Slice& value,
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uint64_t file_size) = 0;
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virtual UserCollectedProperties GetReadableProperties() const = 0;
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virtual bool NeedCompact() const { return false; }
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};
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// Facrtory for internal table properties collector.
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class IntTblPropCollectorFactory {
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public:
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virtual ~IntTblPropCollectorFactory() {}
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// has to be thread-safe
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virtual IntTblPropCollector* CreateIntTblPropCollector() = 0;
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// The name of the properties collector can be used for debugging purpose.
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virtual const char* Name() const = 0;
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};
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// Collecting the statistics for internal keys. Visible only by internal
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// rocksdb modules.
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class InternalKeyPropertiesCollector : public IntTblPropCollector {
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public:
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virtual Status InternalAdd(const Slice& key, const Slice& value,
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uint64_t file_size) override;
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virtual Status Finish(UserCollectedProperties* properties) override;
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virtual const char* Name() const override {
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return "InternalKeyPropertiesCollector";
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}
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UserCollectedProperties GetReadableProperties() const override;
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private:
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uint64_t deleted_keys_ = 0;
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};
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class InternalKeyPropertiesCollectorFactory
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: public IntTblPropCollectorFactory {
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public:
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virtual IntTblPropCollector* CreateIntTblPropCollector() override {
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return new InternalKeyPropertiesCollector();
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}
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virtual const char* Name() const override {
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return "InternalKeyPropertiesCollectorFactory";
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}
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};
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// When rocksdb creates a new table, it will encode all "user keys" into
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// "internal keys", which contains meta information of a given entry.
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//
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// This class extracts user key from the encoded internal key when Add() is
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// invoked.
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class UserKeyTablePropertiesCollector : public IntTblPropCollector {
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public:
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// transfer of ownership
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explicit UserKeyTablePropertiesCollector(TablePropertiesCollector* collector)
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: collector_(collector) {}
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virtual ~UserKeyTablePropertiesCollector() {}
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virtual Status InternalAdd(const Slice& key, const Slice& value,
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uint64_t file_size) override;
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virtual Status Finish(UserCollectedProperties* properties) override;
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virtual const char* Name() const override { return collector_->Name(); }
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UserCollectedProperties GetReadableProperties() const override;
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virtual bool NeedCompact() const override {
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return collector_->NeedCompact();
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}
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protected:
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std::unique_ptr<TablePropertiesCollector> collector_;
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};
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class UserKeyTablePropertiesCollectorFactory
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: public IntTblPropCollectorFactory {
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public:
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explicit UserKeyTablePropertiesCollectorFactory(
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std::shared_ptr<TablePropertiesCollectorFactory> user_collector_factory)
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: user_collector_factory_(user_collector_factory) {}
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virtual IntTblPropCollector* CreateIntTblPropCollector() override {
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return new UserKeyTablePropertiesCollector(
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user_collector_factory_->CreateTablePropertiesCollector());
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}
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virtual const char* Name() const override {
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return user_collector_factory_->Name();
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}
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private:
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std::shared_ptr<TablePropertiesCollectorFactory> user_collector_factory_;
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};
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} // namespace rocksdb
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