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// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
// This source code is licensed under both the GPLv2 (found in the
// COPYING file in the root directory) and Apache 2.0 License
// (found in the LICENSE.Apache file in the root directory).
#pragma once
#include <string>
#include "rocksdb/compaction_filter.h"
#include "rocksdb/slice.h"
namespace ROCKSDB_NAMESPACE {
namespace cassandra {
/**
* Compaction filter for removing expired Cassandra data with ttl.
* If option `purge_ttl_on_expiration` is set to true, expired data
* will be directly purged. Otherwise expired data will be converted
* tombstones first, then be eventally removed after gc grace period.
* `purge_ttl_on_expiration` should only be on in the case all the
* writes have same ttl setting, otherwise it could bring old data back.
*
* Compaction filter is also in charge of removing tombstone that has been
* promoted to kValue type after serials of merging in compaction.
*/
class CassandraCompactionFilter : public CompactionFilter {
public:
explicit CassandraCompactionFilter(bool purge_ttl_on_expiration,
int32_t gc_grace_period_in_seconds)
: purge_ttl_on_expiration_(purge_ttl_on_expiration),
gc_grace_period_in_seconds_(gc_grace_period_in_seconds) {}
const char* Name() const override;
virtual Decision FilterV2(int level, const Slice& key, ValueType value_type,
const Slice& existing_value, std::string* new_value,
std::string* skip_until) const override;
private:
bool purge_ttl_on_expiration_;
int32_t gc_grace_period_in_seconds_;
};
} // namespace cassandra
} // namespace ROCKSDB_NAMESPACE
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