[jira] [Commented] (YARN-5436) Race in AsyncDispatcher can cause random test failures in Tez(probably YARN also )

["Zhiyuan Yang (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/YARN-5436?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15396052#comment-15396052 ] 

Zhiyuan Yang commented on YARN-5436:
------------------------------------

Data race can cause RM stop without handling last enqueued event.

> Race in AsyncDispatcher can cause random test failures in Tez(probably YARN also )
> ----------------------------------------------------------------------------------
>
>                 Key: YARN-5436
>                 URL: https://issues.apache.org/jira/browse/YARN-5436
>             Project: Hadoop YARN
>          Issue Type: Bug
>            Reporter: Zhiyuan Yang
>            Assignee: Zhiyuan Yang
>
> In YARN-2264, a race in DrainDispatcher was fixed. Unfortunately, it also exists in AsyncDispatcher but wasn't found. In YARN-2991, another DrainDispatcher bug was fixed by letting DrainDispatcher extend AsyncDispatcher because AsyncDispatcher doesn't have such issue. However, this shadows YARN-2264, and now similar race reappears in Tez unit tests (probably also YARN unit tests also).



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