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