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https://issues.apache.org/jira/browse/YARN-4254?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14953368#comment-14953368
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Bibin A Chundatt commented on YARN-4254:
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{quote}
Did it really try forever?
{quote}
It did get stuck for for more than 48 hours. And 4-5 logs files with same
exception.
> ApplicationAttempt stuck for ever due to UnknowHostexception
> ------------------------------------------------------------
>
> Key: YARN-4254
> URL: https://issues.apache.org/jira/browse/YARN-4254
> Project: Hadoop YARN
> Issue Type: Bug
> Reporter: Bibin A Chundatt
> Assignee: Bibin A Chundatt
> Attachments: 0001-YARN-4254.patch
>
>
> Scenario
> =======
> 1. RM HA and 5 NMs available in cluster and are working fine
> 2. Add one more NM to the same cluster but RM /etc/hosts not updated.
> 3. Submit application to the same cluster
> If Am get allocated to the newly added NM the *application attempt will get
> stuck for ever*.User will not get to know why the same happened.
> Impact
> 1.RM logs gets overloaded with exception
> 2.Application gets stuck for ever.
> Handling suggestion YARN-261 allows for Fail application attempt .
> If we fail the same next attempt could get assigned to another NM.
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