fork of https://github.com/oxigraph/rocksdb and https://github.com/facebook/rocksdb for nextgraph and oxigraph
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57 lines
2.2 KiB
57 lines
2.2 KiB
// 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 "rocksdb/compaction_filter.h"
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#include "rocksdb/slice.h"
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#include "utilities/cassandra/cassandra_options.h"
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namespace ROCKSDB_NAMESPACE {
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namespace cassandra {
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/**
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* Compaction filter for removing expired Cassandra data with ttl.
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* If option `purge_ttl_on_expiration` is set to true, expired data
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* will be directly purged. Otherwise expired data will be converted
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* tombstones first, then be eventally removed after gc grace period.
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* `purge_ttl_on_expiration` should only be on in the case all the
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* writes have same ttl setting, otherwise it could bring old data back.
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*
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* Compaction filter is also in charge of removing tombstone that has been
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* promoted to kValue type after serials of merging in compaction.
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*/
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class CassandraCompactionFilter : public CompactionFilter {
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public:
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explicit CassandraCompactionFilter(bool purge_ttl_on_expiration,
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int32_t gc_grace_period_in_seconds);
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static const char* kClassName() { return "CassandraCompactionFilter"; }
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const char* Name() const override { return kClassName(); }
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virtual Decision FilterV2(int level, const Slice& key, ValueType value_type,
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const Slice& existing_value, std::string* new_value,
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std::string* skip_until) const override;
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private:
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CassandraOptions options_;
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};
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class CassandraCompactionFilterFactory : public CompactionFilterFactory {
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public:
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explicit CassandraCompactionFilterFactory(bool purge_ttl_on_expiration,
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int32_t gc_grace_period_in_seconds);
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~CassandraCompactionFilterFactory() override {}
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std::unique_ptr<CompactionFilter> CreateCompactionFilter(
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const CompactionFilter::Context& context) override;
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static const char* kClassName() { return "CassandraCompactionFilterFactory"; }
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const char* Name() const override { return kClassName(); }
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private:
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CassandraOptions options_;
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};
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} // namespace cassandra
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} // namespace ROCKSDB_NAMESPACE
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