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https://issues.apache.org/jira/browse/FLINK-1088?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14138966#comment-14138966
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Stephan Ewen commented on FLINK-1088:
-------------------------------------
This is a known issue.
Afaik, [~uce] is working on a patch for the network stack that fixes the
streaming deadlocks by introducing blocking channels, which will be used in
certain situations.
> Iteration head deadlock
> -----------------------
>
> Key: FLINK-1088
> URL: https://issues.apache.org/jira/browse/FLINK-1088
> Project: Flink
> Issue Type: Bug
> Components: Iterations
> Affects Versions: 0.7-incubating
> Reporter: Márton Balassi
>
> Flink hangs up for an iterative algorithm for which Stratosphere 0.5 was
> working.
> For the code please check out the following repo:
> https://github.com/mbalassi/als-comparison
> The stacktrace includes the following on Brokers:
> "Join(Sends the rows of p with multiple keys)) (1/1)" daemon prio=10
> tid=0x00007f8928014800 nid=0x998 waiting on condition [0x00007f8912eed000]
> java.lang.Thread.State: WAITING (parking)
> at sun.misc.Unsafe.park(Native Method)
> - parking to wait for <0x00000007d2668ea0> (a
> java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
> at java.util.concurrent.locks.LockSupport.park(LockSupport.java:186)
> at
> java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2043)
> at
> java.util.concurrent.ArrayBlockingQueue.take(ArrayBlockingQueue.java:374)
> at
> org.apache.flink.runtime.iterative.concurrent.Broker.get(Broker.java:63)
> at
> org.apache.flink.runtime.iterative.task.IterationIntermediatePactTask.run(IterationIntermediatePactTask.java:84)
> at
> org.apache.flink.runtime.operators.RegularPactTask.invoke(RegularPactTask.java:375)
> at
> org.apache.flink.runtime.execution.RuntimeEnvironment.run(RuntimeEnvironment.java:265)
> at java.lang.Thread.run(Thread.java:744)
> This part waits for the iteration head which has not been started yet and
> thus induces a deadlock.
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