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https://issues.apache.org/jira/browse/YARN-5436?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Zhiyuan Yang updated YARN-5436:
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Description: In YARN-2264, a race in DrainDispatcher was fixed.
Unfortunately, it also exists in AsyncDispatcher (this was found and ignored in
YARN-3878 but never documented...). In YARN-2991, another DrainDispatcher bug
was fixed by letting DrainDispatcher reuse some AsyncDispatcher method 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). (was: 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 reuse some
AsyncDispatcher method 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).)
> 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 (this was found and ignored in YARN-3878 but never
> documented...). In YARN-2991, another DrainDispatcher bug was fixed by
> letting DrainDispatcher reuse some AsyncDispatcher method 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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