[jira] [Commented] (FLINK-1577) Misleading error messages when cancelling tasks

["Ufuk Celebi (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FLINK-1577?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14325695#comment-14325695 ] 

Ufuk Celebi commented on FLINK-1577:
------------------------------------

{code}
10:56:40,161 ERROR org.apache.flink.runtime.execution.RuntimeEnvironment         - Error during running invokable: Event handler interrupted without reaching end-of-superstep.
java.lang.RuntimeException: Event handler interrupted without reaching end-of-superstep.
{code}

{code}
10:56:40,197 ERROR org.apache.flink.runtime.execution.RuntimeEnvironment         - Error during running invokable: Bug in reader logic: queried for a buffer although none was available.
java.lang.IllegalStateException: Bug in reader logic: queried for a buffer although none was available.
        at org.apache.flink.runtime.io.network.api.reader.BufferReader.getNextBufferBlocking(BufferReader.java:267)
{code}

> Misleading error messages when cancelling tasks
> -----------------------------------------------
>
>                 Key: FLINK-1577
>                 URL: https://issues.apache.org/jira/browse/FLINK-1577
>             Project: Flink
>          Issue Type: Improvement
>          Components: Distributed Runtime
>    Affects Versions: master
>            Reporter: Ufuk Celebi
>
> A user running a Flink version before bec9c4d ran into a job manager failure (fixed in bec9c4d), which lead to restarting the JM and cancelling/clearing all tasks on the TMs.
> The logs of the TMs were inconclusive. I think part of that has been fixed by now, e.g. there is a log message when cancelAndClearEverything is called, but the task thread (RuntimeEnvironment) always logs an error when interrupted during the run method -- even if the task gets cancelled.
> I think these error messages are misleading and only the root cause is important (i.e. non-failed tasks should be silently cancelled).



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