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https://issues.apache.org/jira/browse/FLINK-8020?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16357296#comment-16357296
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Tzu-Li (Gordon) Tai commented on FLINK-8020:
--------------------------------------------

Moving this to 1.4.2, since on the mailing lists the community agreed to move 
forward with what we have already for 1.4.1.
Please reopen and let me know if you disagree.

> Deadlock found in Async I/O operator
> ------------------------------------
>
>                 Key: FLINK-8020
>                 URL: https://issues.apache.org/jira/browse/FLINK-8020
>             Project: Flink
>          Issue Type: Bug
>          Components: Kafka Connector, Streaming, Streaming Connectors
>    Affects Versions: 1.3.2
>         Environment: Kafka 0.8.2 and Flink 1.3.2 on YARN mode
>            Reporter: Weihua Jiang
>            Priority: Critical
>             Fix For: 1.5.0, 1.4.2
>
>         Attachments: jstack53009(2).out, jstack67976-2.log
>
>
> Our streaming job run into trouble in these days after a long time smooth 
> running. One issue we found is 
> [https://issues.apache.org/jira/browse/FLINK-8019] and another one is this 
> one.
> After analyzing the jstack, we believe  we found a DEAD LOCK in flink:
> 1. The thread "cache-process0 -> async-operator0 -> Sink: hbase-sink0 (8/8)" 
> hold lock 0x00000007b6aa1788 and is waiting for lock 0x00000007b6aa1940.
> 2. The thread "Time Trigger for cache-process0 -> async-operator0 -> Sink: 
> hbase-sink0 (8/8)" hold lock 0x00000007b6aa1940 and is waiting for lock 
> 0x00000007b6aa1788. 
> This DEADLOCK made the job fail to proceed. 



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