Github user azagrebin commented on a diff in the pull request:
https://github.com/apache/flink/pull/6159#discussion_r195443441
--- Diff:
flink-runtime/src/main/java/org/apache/flink/runtime/state/AbstractKeyGroupPartitionedSnapshot.java
---
@@ -0,0 +1,76 @@
+/*
+ * 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.runtime.state;
+
+import org.apache.flink.core.memory.DataOutputView;
+
+import javax.annotation.Nonnull;
+
+import java.io.IOException;
+
+
+/**
+ * Abstract base class for implementations of
+ * {@link
org.apache.flink.runtime.state.StateSnapshot.KeyGroupPartitionedSnapshot} based
on the result of a
+ * {@link AbstractKeyGroupPartitioner}.
+ *
+ * @param <T> type of the written elements.
+ */
+public abstract class AbstractKeyGroupPartitionedSnapshot<T> implements
StateSnapshot.KeyGroupPartitionedSnapshot {
+
+ /** The partitioning result to be written by key-group. */
+ @Nonnull
+ private final AbstractKeyGroupPartitioner.PartitioningResult<T>
partitioningResult;
+
+ public AbstractKeyGroupPartitionedSnapshot(
+ @Nonnull AbstractKeyGroupPartitioner.PartitioningResult<T>
partitioningResult) {
+ this.partitioningResult = partitioningResult;
+ }
+
+ @Override
+ public void writeMappingsInKeyGroup(@Nonnull DataOutputView dov, int
keyGroupId) throws IOException {
--- End diff --
@Nonnegative int keyGroupId, for consistency
---
