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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-7623) Detecting whether an operator is restored doesn't work with chained state
Date Tue, 24 Oct 2017 13:09:00 GMT

    [ https://issues.apache.org/jira/browse/FLINK-7623?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16216863#comment-16216863
] 

ASF GitHub Bot commented on FLINK-7623:
---------------------------------------

Github user aljoscha commented on the issue:

    https://github.com/apache/flink/pull/4851
  
    It's excellent that you separated the cleanup work from the actual change. 👍 


> Detecting whether an operator is restored doesn't work with chained state
> -------------------------------------------------------------------------
>
>                 Key: FLINK-7623
>                 URL: https://issues.apache.org/jira/browse/FLINK-7623
>             Project: Flink
>          Issue Type: Bug
>          Components: DataStream API, State Backends, Checkpointing
>    Affects Versions: 1.4.0, 1.3.2
>            Reporter: Aljoscha Krettek
>            Assignee: Piotr Nowojski
>            Priority: Blocker
>             Fix For: 1.4.0
>
>         Attachments: StreamingJob.java
>
>
> Originally reported on the ML: https://lists.apache.org/thread.html/22a2cf83de3107aa81a03a921325a191c29df8aa8676798fcd497199@%3Cuser.flink.apache.org%3E
> If we have a chain of operators where multiple of them have operator state, detection
of the {{context.isRestored()}} flag (of {{CheckpointedFunction}}) does not work correctly.
It's best exemplified using this minimal example where both the source and the flatMap have
state:
> {code}
> final StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();
> env
> 		.addSource(new MaSource()).uid("source-1")
> 		.flatMap(new MaFlatMap()).uid("flatMap-1");
> env.execute("testing");
> {code}
> If I do a savepoint with these UIDs, then change "source-1" to "source-2" and restore
from the savepoint {{context.isRestored()}} still reports {{true}} for the source.



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