Github user StefanRRichter commented on a diff in the pull request: https://github.com/apache/flink/pull/5582#discussion_r192076060 --- Diff: flink-state-backends/flink-statebackend-rocksdb/src/main/java/org/apache/flink/contrib/streaming/state/RocksDBIncrementalCheckpointUtils.java --- @@ -0,0 +1,80 @@ +/* + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed with + * this work for additional information regarding copyright ownership. + * The ASF licenses this file to You under the Apache License, Version 2.0 + * (the "License"); you may not use this file except in compliance with + * the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +package org.apache.flink.contrib.streaming.state; + +import org.apache.flink.runtime.state.KeyGroupRange; + +import org.rocksdb.ColumnFamilyHandle; +import org.rocksdb.RocksDB; +import org.rocksdb.RocksDBException; + +import java.util.List; + +/** + * Utils for RocksDB Incremental Checkpoint. + */ +public class RocksDBIncrementalCheckpointUtils { + + public static void clipDBWithKeyGroupRange( + RocksDB db, + List<ColumnFamilyHandle> columnFamilyHandles, + KeyGroupRange targetGroupRange, + KeyGroupRange currentGroupRange, + int keyGroupPrefixBytes) throws RocksDBException { + + for (ColumnFamilyHandle columnFamilyHandle : columnFamilyHandles) { + if (currentGroupRange.getStartKeyGroup() < targetGroupRange.getStartKeyGroup()) { + byte[] beginKey = RocksDBKeySerializationUtils.serializeKeyGroup( + currentGroupRange.getStartKeyGroup(), keyGroupPrefixBytes); + byte[] endKye = RocksDBKeySerializationUtils.serializeKeyGroup( --- End diff -- typo: endKye
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