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a2dc88889d
Leveled strategy will not benefit from this strategy because there's only a few sstables that will contain a given partition key, which means that a clustering key that belongs to a specific partition key can only be in a few sstables as well. Date tiered strategy is the one that will actually benefit the most from this optimization. Size tiered may benefit from it too if clustering key isn't overwritten, but it will not use the clustering optimization. Signed-off-by: Raphael S. Carvalho <raphaelsc@scylladb.com>
114 lines
3.9 KiB
C++
114 lines
3.9 KiB
C++
/*
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* Copyright (C) 2015 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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class column_family;
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class schema;
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using schema_ptr = lw_shared_ptr<const schema>;
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namespace sstables {
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enum class compaction_strategy_type {
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null,
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major,
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size_tiered,
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leveled,
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date_tiered,
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};
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class compaction_strategy_impl;
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class sstable;
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class sstable_set;
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struct compaction_descriptor;
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class compaction_strategy {
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::shared_ptr<compaction_strategy_impl> _compaction_strategy_impl;
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public:
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compaction_strategy(::shared_ptr<compaction_strategy_impl> impl);
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compaction_strategy();
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~compaction_strategy();
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compaction_strategy(const compaction_strategy&);
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compaction_strategy(compaction_strategy&&);
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compaction_strategy& operator=(compaction_strategy&&);
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// Return a list of sstables to be compacted after applying the strategy.
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compaction_descriptor get_sstables_for_compaction(column_family& cfs, std::vector<lw_shared_ptr<sstable>> candidates);
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// Return if parallel compaction is allowed by strategy.
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bool parallel_compaction() const;
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// Return if optimization to rule out sstables based on clustering key filter should be applied.
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bool use_clustering_key_filter() const;
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// An estimation of number of compaction for strategy to be satisfied.
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int64_t estimated_pending_compactions(column_family& cf) const;
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static sstring name(compaction_strategy_type type) {
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switch (type) {
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case compaction_strategy_type::null:
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return "NullCompactionStrategy";
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case compaction_strategy_type::major:
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return "MajorCompactionStrategy";
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case compaction_strategy_type::size_tiered:
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return "SizeTieredCompactionStrategy";
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case compaction_strategy_type::leveled:
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return "LeveledCompactionStrategy";
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case compaction_strategy_type::date_tiered:
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return "DateTieredCompactionStrategy";
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default:
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throw std::runtime_error("Invalid Compaction Strategy");
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}
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}
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static compaction_strategy_type type(const sstring& name) {
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auto pos = name.find("org.apache.cassandra.db.compaction.");
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sstring short_name = (pos == sstring::npos) ? name : name.substr(pos + 35);
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if (short_name == "NullCompactionStrategy") {
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return compaction_strategy_type::null;
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} else if (short_name == "MajorCompactionStrategy") {
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return compaction_strategy_type::major;
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} else if (short_name == "SizeTieredCompactionStrategy") {
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return compaction_strategy_type::size_tiered;
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} else if (short_name == "LeveledCompactionStrategy") {
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return compaction_strategy_type::leveled;
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} else if (short_name == "DateTieredCompactionStrategy") {
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return compaction_strategy_type::date_tiered;
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} else {
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throw exceptions::configuration_exception(sprint("Unable to find compaction strategy class '%s'", name));
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}
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}
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compaction_strategy_type type() const;
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sstring name() const {
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return name(type());
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}
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sstable_set make_sstable_set(schema_ptr schema) const;
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};
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// Creates a compaction_strategy object from one of the strategies available.
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compaction_strategy make_compaction_strategy(compaction_strategy_type strategy, const std::map<sstring, sstring>& options);
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}
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