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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-5892) Recover job state at the granularity of operator
Date Wed, 26 Apr 2017 13:51:04 GMT

    [ https://issues.apache.org/jira/browse/FLINK-5892?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15984847#comment-15984847
] 

ASF GitHub Bot commented on FLINK-5892:
---------------------------------------

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

    https://github.com/apache/flink/pull/3770#discussion_r113411211
  
    --- Diff: flink-runtime/src/main/java/org/apache/flink/runtime/jobgraph/OperatorID.java
---
    @@ -0,0 +1,50 @@
    +/*
    + * 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.jobgraph;
    +
    +import org.apache.flink.util.AbstractID;
    +
    +import javax.xml.bind.DatatypeConverter;
    +
    +/**
    + * A class for statistically unique operator IDs.
    + */
    +public class OperatorID extends AbstractID {
    +
    +	private static final long serialVersionUID = 1L;
    +
    +	public OperatorID() {
    +		super();
    +	}
    --- End diff --
    
    Code style: I would introduce an empty line in between and the call to super is ok, but
also not required.


> Recover job state at the granularity of operator
> ------------------------------------------------
>
>                 Key: FLINK-5892
>                 URL: https://issues.apache.org/jira/browse/FLINK-5892
>             Project: Flink
>          Issue Type: New Feature
>          Components: State Backends, Checkpointing
>            Reporter: Guowei Ma
>            Assignee: Guowei Ma
>
> JobGraph has no `Operator` info so `ExecutionGraph` can only recovery at the granularity
of task.
> This leads to the result that the operator of the job may not recover the state from
a save point even if the save point has the state of operator. 
>  https://docs.google.com/document/d/19suTRF0nh7pRgeMnIEIdJ2Fq-CcNVt5_hR3cAoICf7Q/edit#.



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