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Diffstat (limited to '')
-rw-r--r-- | src/rocksdb/utilities/cassandra/cassandra_compaction_filter.h | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/src/rocksdb/utilities/cassandra/cassandra_compaction_filter.h b/src/rocksdb/utilities/cassandra/cassandra_compaction_filter.h new file mode 100644 index 000000000..ac2588106 --- /dev/null +++ b/src/rocksdb/utilities/cassandra/cassandra_compaction_filter.h @@ -0,0 +1,42 @@ +// 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 |