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https://issues.apache.org/jira/browse/MAPREDUCE-5364?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13700426#comment-13700426
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Arun C Murthy commented on MAPREDUCE-5364:
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[~tucu00] Shouldn't this get into 1.2.1 too?
> Deadlock between RenewalTimerTask methods cancel() and run()
> ------------------------------------------------------------
>
> Key: MAPREDUCE-5364
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-5364
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Affects Versions: 1.2.0
> Reporter: Karthik Kambatla
> Assignee: Karthik Kambatla
> Fix For: 1.3.0
>
> Attachments: mr-5364-1.patch
>
>
> MAPREDUCE-4860 introduced a local variable {{cancelled}} in
> {{RenewalTimerTask}} to fix the race where {{DelegationTokenRenewal}}
> attempts to renew a token even after the job is removed. However, the patch
> also makes {{run()}} and {{cancel()}} synchronized methods leading to a
> potential deadlock against {{run()}}'s catch-block (error-path).
> The deadlock stacks below:
> {noformat}
> -
> org.apache.hadoop.mapreduce.security.token.DelegationTokenRenewal$RenewalTimerTask.cancel()
> @bci=0, line=240 (Interpreted frame)
> -
> org.apache.hadoop.mapreduce.security.token.DelegationTokenRenewal.removeDelegationTokenRenewalForJob(org.apache.hadoop.mapreduce.JobID)
> @bci=109, line=319 (Interpreted frame)
> {noformat}
> {noformat}
> -
> org.apache.hadoop.mapreduce.security.token.DelegationTokenRenewal.removeFailedDelegationToken(org.apache.hadoop.mapreduce.security.token.DelegationTokenRenewal$DelegationTokenToRenew)
> @bci=62, line=297 (Interpreted frame)
> -
> org.apache.hadoop.mapreduce.security.token.DelegationTokenRenewal.access$300(org.apache.hadoop.mapreduce.security.token.DelegationTokenRenewal$DelegationTokenToRenew)
> @bci=1, line=47 (Interpreted frame)
> -
> org.apache.hadoop.mapreduce.security.token.DelegationTokenRenewal$RenewalTimerTask.run()
> @bci=148, line=234 (Interpreted frame)
> {noformat}
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