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https://issues.apache.org/jira/browse/FLINK-31910?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17723841#comment-17723841
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Jiang Xin commented on FLINK-31910:
-----------------------------------
>From the demo, I'm not sure if the `BroadcastUtils.withBroadcastStream` mix up
>the order of the two parameters, because it is not broadcasting the
>`variableStreams`. I reversed the two parameters and the demo works well.
> Using BroadcastUtils#withBroadcast in iteration perround mode got stuck
> -----------------------------------------------------------------------
>
> Key: FLINK-31910
> URL: https://issues.apache.org/jira/browse/FLINK-31910
> Project: Flink
> Issue Type: Bug
> Components: Library / Machine Learning
> Affects Versions: ml-2.3.0
> Reporter: Zhipeng Zhang
> Priority: Major
>
> Using BroadcastUtils#withBroadcast in iteration perround mode got stuck.
> >From the thread dump, it seems that the head operator and criteria node are
> stuck and waiting for a mail.
>
> {code:java}
> "output-head-Parallel Collection Source -> Sink: Unnamed (4/4)#0" #228 prio=5
> os_prio=31 tid=0x00007f9e1d083800 nid=0x19b07 waiting on condition
> [0x0000700013db6000]
> java.lang.Thread.State: TIMED_WAITING (parking)
> at sun.misc.Unsafe.park(Native Method)
> - parking to wait for <0x0000000747a83270> (a
> java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
> at java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:215)
> at
> java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2163)
> at
> org.apache.flink.streaming.runtime.tasks.mailbox.TaskMailboxImpl.take(TaskMailboxImpl.java:149)
> at
> org.apache.flink.streaming.runtime.tasks.mailbox.MailboxProcessor.processMailsWhenDefaultActionUnavailable(MailboxProcessor.java:335)
> at
> org.apache.flink.streaming.runtime.tasks.mailbox.MailboxProcessor.processMail(MailboxProcessor.java:324)
> at
> org.apache.flink.streaming.runtime.tasks.mailbox.MailboxProcessor.runMailboxLoop(MailboxProcessor.java:201)
> at
> org.apache.flink.streaming.runtime.tasks.StreamTask.runMailboxLoop(StreamTask.java:804)
> at
> org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:753)
> at
> org.apache.flink.runtime.taskmanager.Task$$Lambda$1383/280145505.run(Unknown
> Source)
> at
> org.apache.flink.runtime.taskmanager.Task.runWithSystemExitMonitoring(Task.java:948)
> at
> org.apache.flink.runtime.taskmanager.Task.restoreAndInvoke(Task.java:927)
> at org.apache.flink.runtime.taskmanager.Task.doRun(Task.java:741)
> at org.apache.flink.runtime.taskmanager.Task.run(Task.java:563)
> at java.lang.Thread.run(Thread.java:748) {code}
>
> The demo for this bug could be found here:
> https://github.com/zhipeng93/flink-ml/tree/FLINK-31910-demo-case
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