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From StephanEwen <...@git.apache.org>
Subject [GitHub] flink pull request #3524: [FLINK-6014][checkpoint] Allow the registration of...
Date Wed, 29 Mar 2017 13:16:02 GMT
Github user StephanEwen commented on a diff in the pull request:

    https://github.com/apache/flink/pull/3524#discussion_r108671268
  
    --- 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 {
    +
    +	private static final long serialVersionUID = -8357254413007773970L;
    +
    +	/** All registered state objects */
    +	private final Map<String, Tuple2<StateObject, Integer>> registeredStates
= new HashMap<>();
    --- End diff --
    
    I think we can be a bit more efficient by having a `StateObjectAndCount` class, rather
than a tuple 2. Safes the reference for the Integer.


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