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https://issues.apache.org/jira/browse/YARN-2263?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14058137#comment-14058137
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Chen He commented on YARN-2263:
-------------------------------
Thank you for the comments. Jason Lowe. I will close it.
> CSQueueUtils.computeMaxActiveApplicationsPerUser may cause deadlock for
> nested MapReduce jobs
> ---------------------------------------------------------------------------------------------
>
> Key: YARN-2263
> URL: https://issues.apache.org/jira/browse/YARN-2263
> Project: Hadoop YARN
> Issue Type: Bug
> Affects Versions: 0.23.10, 2.4.1
> Reporter: Chen He
>
> computeMaxActiveApplicationsPerUser() has a lower bound "1". For a nested
> MapReduce job which files new mapreduce jobs in its mapper/reducer, it will
> cause job stuck.
> public static int computeMaxActiveApplicationsPerUser(
> int maxActiveApplications, int userLimit, float userLimitFactor) {
> return Math.max(
> (int)Math.ceil(
> maxActiveApplications * (userLimit / 100.0f) * userLimitFactor),
> 1);
> }
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