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From: uce <git@git.apache.org>
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Subject: [GitHub] flink pull request: [FLINK-2354] Add job graph and
 checkpoint reco...
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Message-Id: <20151007175415.48026E0A9B@git1-us-west.apache.org>
Date: Wed,  7 Oct 2015 17:54:15 +0000 (UTC)

Github user uce commented on a diff in the pull request:

    https://github.com/apache/flink/pull/1153#discussion_r41422825
  
    --- Diff: flink-runtime/src/main/java/org/apache/flink/runtime/checkpoint/ZooKeeperCheckpointIDCounter.java ---
    @@ -0,0 +1,130 @@
    +/*
    + * 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.checkpoint;
    +
    +import org.apache.curator.framework.CuratorFramework;
    +import org.apache.curator.framework.recipes.shared.SharedCount;
    +import org.apache.curator.framework.recipes.shared.VersionedValue;
    +import org.apache.curator.framework.state.ConnectionState;
    +import org.apache.curator.framework.state.ConnectionStateListener;
    +import org.apache.flink.runtime.jobmanager.RecoveryMode;
    +import org.slf4j.Logger;
    +import org.slf4j.LoggerFactory;
    +
    +import static com.google.common.base.Preconditions.checkNotNull;
    +
    +/**
    + * {@link CheckpointIDCounter} instances for JobManagers running in {@link RecoveryMode#ZOOKEEPER}.
    + *
    + * <p>Each counter creates a ZNode:
    + * <pre>
    + * +----O /flink/checkpoint-counter/&lt;job-id&gt; 1 [persistent]
    + * .
    + * .
    + * .
    + * +----O /flink/checkpoint-counter/&lt;job-id&gt; N [persistent]
    + * </pre>
    + *
    + * <p>The checkpoints IDs are required to be ascending (per job). In order to guarantee this in case
    + * of job manager failures we use ZooKeeper to have a shared counter across job manager instances.
    + */
    +public class ZooKeeperCheckpointIDCounter implements CheckpointIDCounter {
    --- End diff --
    
    Resolved


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