Github user StephanEwen commented on a diff in the pull request: https://github.com/apache/flink/pull/3524#discussion_r108670950 --- Diff: flink-runtime/src/main/java/org/apache/flink/runtime/state/SharedStateRegistry.java --- @@ -0,0 +1,192 @@ +/* + * 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.annotation.VisibleForTesting; +import org.apache.flink.api.java.tuple.Tuple2; + +import java.io.Serializable; +import java.util.ArrayList; +import java.util.Collection; +import java.util.HashMap; +import java.util.List; +import java.util.Map; + +/** + * A {@code SharedStateRegistry} will be deployed in the + * {@link org.apache.flink.runtime.checkpoint.CheckpointCoordinator} to + * maintain the reference count of those state objects shared among different + * checkpoints. Each shared state object must be identified by a unique key. + */ +public class SharedStateRegistry implements Serializable { --- End diff -- I think we don't need to make the registry serializable. In one of my next changes, the `CompletedCheckpoint` is not serializable any more, and then the registry can also be non serializable.
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