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https://issues.apache.org/jira/browse/YARN-2964?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14250691#comment-14250691
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Jian He commented on YARN-2964:
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bq. Once the token was stashed in the set, subsequent attempts from sub-jobs to
store the token would silently be ignored because the token was already in the
set.
After digging into the code, I found even if we are not canceling the token if
the flag is set, we still remove the token from the global set. This means that
if sub-jobs doesn't set the flag, it'll be added to the global set again and
once the sub-job finishes the token is canceled. I'm wondering how this worked
before, [~jlowe], [~daryn] could you shed some light on this ?
> RM prematurely cancels tokens for jobs that submit jobs (oozie)
> ---------------------------------------------------------------
>
> Key: YARN-2964
> URL: https://issues.apache.org/jira/browse/YARN-2964
> Project: Hadoop YARN
> Issue Type: Bug
> Components: resourcemanager
> Affects Versions: 2.6.0
> Reporter: Daryn Sharp
> Assignee: Jian He
> Priority: Blocker
>
> The RM used to globally track the unique set of tokens for all apps. It
> remembered the first job that was submitted with the token. The first job
> controlled the cancellation of the token. This prevented completion of
> sub-jobs from canceling tokens used by the main job.
> As of YARN-2704, the RM now tracks tokens on a per-app basis. There is no
> notion of the first/main job. This results in sub-jobs canceling tokens and
> failing the main job and other sub-jobs. It also appears to schedule
> multiple redundant renewals.
> The issue is not immediately obvious because the RM will cancel tokens ~10
> min (NM livelyness interval) after log aggregation completes. The result is
> an oozie job, ex. pig, that will launch many sub-jobs over time will fail if
> any sub-jobs are launched >10 min after any sub-job completes. If all other
> sub-jobs complete within that 10 min window, then the issue goes unnoticed.
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