[
https://issues.apache.org/jira/browse/YARN-2964?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14248669#comment-14248669
]
Jason Lowe commented on YARN-2964:
----------------------------------
bq. One question, who is setting the shouldCancelAtEnd flag? is it only the
main job or all sub-jobs are setting it?
AFAIK only the Oozie launcher job is requesting tokens not be canceled at the
end of the job. If all of the sub-jobs were also requesting that then we
wouldn't see the issue since nobody would cancel the token. I'm not sure all
of the sub-jobs in all cases are asking for the token to be canceled at the end
of the job, but in the current code it only takes one to spoil it for the
others.
> 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
> 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.
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
