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From uce <...@git.apache.org>
Subject [GitHub] flink pull request: [FLINK-2460] [runtime] Check parent state in i...
Date Mon, 24 Aug 2015 15:40:30 GMT
GitHub user uce opened a pull request:


    [FLINK-2460] [runtime] Check parent state in isReleased() check of partition view

    Adds a check for the state of the parent partition a partition **view** belongs to (the
view consumes a sub partition).
    During cancelling there was a possible interleaving when a released partition was not
noticed by the consumer. The issue for this PR reported the following stack trace:
    "SortMerger Reading Thread" daemon prio=10 tid=0x00007f7740107800 nid=0x13cbc runnable
       java.lang.Thread.State: RUNNABLE
    	at org.apache.flink.runtime.io.network.partition.consumer.LocalInputChannel.getNextLookAhead(LocalInputChannel.java:256)
    	at org.apache.flink.runtime.io.network.partition.consumer.LocalInputChannel.requestSubpartition(LocalInputChannel.java:120)
    	- locked <0x00000000ef9c1028> (a java.lang.Object)
    	at org.apache.flink.runtime.io.network.partition.consumer.SingleInputGate.requestPartitions(SingleInputGate.java:377)
    	- locked <0x00000000ef9c0da8> (a java.lang.Object)
    	at org.apache.flink.runtime.io.network.partition.consumer.SingleInputGate.getNextBufferOrEvent(SingleInputGate.java:400)
    	at org.apache.flink.runtime.io.network.api.reader.AbstractRecordReader.getNextRecord(AbstractRecordReader.java:79)
    	at org.apache.flink.runtime.io.network.api.reader.MutableRecordReader.next(MutableRecordReader.java:34)
    	at org.apache.flink.runtime.operators.util.ReaderIterator.next(ReaderIterator.java:59)
    	at org.apache.flink.runtime.operators.sort.UnilateralSortMerger$ReadingThread.go(UnilateralSortMerger.java:958)
    	at org.apache.flink.runtime.operators.sort.UnilateralSortMerger$ThreadBase.run(UnilateralSortMerger.java:781)
    "CoGroup (CoGroup at groupReduceOnNeighbors(Graph.java:1405)) (4/4)" daemon prio=10 tid=0x00007f772c45a800
nid=0x13c9e waiting for monitor entry [0x00007f7721ba1000]
       java.lang.Thread.State: BLOCKED (on object monitor)
    	at org.apache.flink.runtime.io.network.partition.consumer.SingleInputGate.releaseAllResources(SingleInputGate.java:322)
    	- waiting to lock <0x00000000ef9c0da8> (a java.lang.Object)
    	at org.apache.flink.runtime.io.network.NetworkEnvironment.unregisterTask(NetworkEnvironment.java:379)
    	- locked <0x00000000d5519898> (a java.lang.Object)
    	at org.apache.flink.runtime.taskmanager.Task.run(Task.java:674)
    	at java.lang.Thread.run(Thread.java:701)
    This PR adds a test that verifies that the parent release state is checked by the respective
views as well.
    **Note**: This needs to be merged to `release-0.9` as well.

You can merge this pull request into a Git repository by running:

    $ git pull https://github.com/uce/flink cogroup_closer-2460

Alternatively you can review and apply these changes as the patch at:


To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #1051
commit 7c99da9c716238349e5bfd17a1d48c6a338e5f76
Author: Ufuk Celebi <uce@apache.org>
Date:   2015-08-10T13:15:07Z

    [FLINK-2460] [runtime] Check parent state in isReleased() check of partition view


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