fdf882ded2
Summary: When dynamically linking two binaries together, different builds of RocksDB from two sources might cause errors. To provide a tool for user to solve the problem, the RocksDB namespace is changed to a flag which can be overridden in build time. Pull Request resolved: https://github.com/facebook/rocksdb/pull/6433 Test Plan: Build release, all and jtest. Try to build with ROCKSDB_NAMESPACE with another flag. Differential Revision: D19977691 fbshipit-source-id: aa7f2d0972e1c31d75339ac48478f34f6cfcfb3e
43 lines
1.7 KiB
C++
43 lines
1.7 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 "rocksdb/compaction_filter.h"
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#include "rocksdb/slice.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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: purge_ttl_on_expiration_(purge_ttl_on_expiration),
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gc_grace_period_in_seconds_(gc_grace_period_in_seconds) {}
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const char* Name() const override;
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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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bool purge_ttl_on_expiration_;
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int32_t gc_grace_period_in_seconds_;
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};
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} // namespace cassandra
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} // namespace ROCKSDB_NAMESPACE
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