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a280dcfe4c
This will be the customization point for compaction strategies, used to inject a specific interposer consumer that can manipulate the fragment stream so that it satisfies the requirements of the compaction strategy. For now the only candidate for injecting such an interposer is time-window compaction strategy, which needs to write sstables that only contains atoms belonging to the same time-window. By default no interposer is injected. Also add an accompanying customization point `adjust_partition_estimate()` which returns the estimated per-sstable partition-estimate that the interposer will produce.
104 lines
4.3 KiB
C++
104 lines
4.3 KiB
C++
/*
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* Copyright (C) 2017 ScyllaDB
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*/
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/*
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* This file is part of Scylla.
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*
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* Scylla is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Scylla is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Scylla. If not, see <http://www.gnu.org/licenses/>.
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*/
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#pragma once
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#include "cql3/statements/property_definitions.hh"
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#include "compaction_backlog_manager.hh"
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#include "compaction_strategy.hh"
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#include "database_fwd.hh"
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#include "db_clock.hh"
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namespace sstables {
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compaction_backlog_tracker& get_unimplemented_backlog_tracker();
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class sstable_set_impl;
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class compaction_descriptor;
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class resharding_descriptor;
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class compaction_strategy_impl {
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static constexpr float DEFAULT_TOMBSTONE_THRESHOLD = 0.2f;
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// minimum interval needed to perform tombstone removal compaction in seconds, default 86400 or 1 day.
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static constexpr std::chrono::seconds DEFAULT_TOMBSTONE_COMPACTION_INTERVAL() { return std::chrono::seconds(86400); }
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protected:
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const sstring TOMBSTONE_THRESHOLD_OPTION = "tombstone_threshold";
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const sstring TOMBSTONE_COMPACTION_INTERVAL_OPTION = "tombstone_compaction_interval";
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bool _use_clustering_key_filter = false;
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bool _disable_tombstone_compaction = false;
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float _tombstone_threshold = DEFAULT_TOMBSTONE_THRESHOLD;
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db_clock::duration _tombstone_compaction_interval = DEFAULT_TOMBSTONE_COMPACTION_INTERVAL();
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public:
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static std::optional<sstring> get_value(const std::map<sstring, sstring>& options, const sstring& name) {
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auto it = options.find(name);
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if (it == options.end()) {
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return std::nullopt;
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}
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return it->second;
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}
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protected:
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compaction_strategy_impl() = default;
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explicit compaction_strategy_impl(const std::map<sstring, sstring>& options) {
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using namespace cql3::statements;
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auto tmp_value = get_value(options, TOMBSTONE_THRESHOLD_OPTION);
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_tombstone_threshold = property_definitions::to_double(TOMBSTONE_THRESHOLD_OPTION, tmp_value, DEFAULT_TOMBSTONE_THRESHOLD);
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tmp_value = get_value(options, TOMBSTONE_COMPACTION_INTERVAL_OPTION);
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auto interval = property_definitions::to_long(TOMBSTONE_COMPACTION_INTERVAL_OPTION, tmp_value, DEFAULT_TOMBSTONE_COMPACTION_INTERVAL().count());
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_tombstone_compaction_interval = db_clock::duration(std::chrono::seconds(interval));
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// FIXME: validate options.
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}
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public:
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virtual ~compaction_strategy_impl() {}
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virtual compaction_descriptor get_sstables_for_compaction(column_family& cfs, std::vector<sstables::shared_sstable> candidates) = 0;
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virtual compaction_descriptor get_major_compaction_job(column_family& cf, std::vector<sstables::shared_sstable> candidates);
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virtual std::vector<resharding_descriptor> get_resharding_jobs(column_family& cf, std::vector<sstables::shared_sstable> candidates);
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virtual void notify_completion(const std::vector<shared_sstable>& removed, const std::vector<shared_sstable>& added) { }
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virtual compaction_strategy_type type() const = 0;
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virtual bool parallel_compaction() const {
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return true;
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}
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virtual int64_t estimated_pending_compactions(column_family& cf) const = 0;
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virtual std::unique_ptr<sstable_set_impl> make_sstable_set(schema_ptr schema) const;
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bool use_clustering_key_filter() const {
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return _use_clustering_key_filter;
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}
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virtual bool ignore_partial_runs() const {
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return false;
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}
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// Check if a given sstable is entitled for tombstone compaction based on its
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// droppable tombstone histogram and gc_before.
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bool worth_dropping_tombstones(const shared_sstable& sst, gc_clock::time_point gc_before);
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virtual compaction_backlog_tracker& get_backlog_tracker() = 0;
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virtual uint64_t adjust_partition_estimate(const mutation_source_metadata& ms_meta, uint64_t partition_estimate);
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virtual reader_consumer make_interposer_consumer(const mutation_source_metadata& ms_meta, reader_consumer end_consumer);
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};
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}
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