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https://issues.apache.org/jira/browse/YARN-2919?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14258208#comment-14258208
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Naganarasimha G R commented on YARN-2919:
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Hi [~kasha]
Thanks for the review,
AFAIU you just want to add a atomic "canceling" state to
{{org.apache.hadoop.security.token.Token}} itself, and once
{{org.apache.hadoop.security.token.Token.cancel(Configuration)}} is invoked
"canceling" state of token will be set to true and when
{{org.apache.hadoop.security.token.Token.renew(Configuration)}} try to renew
the token we should check this state and stop the renew and return expiration
date less than the system time (or -1), right ?
Further based on this Token."cancelling" state
{{org.apache.hadoop.yarn.server.resourcemanager.security.DelegationTokenRenewer.RenewalTimerTask}}
can determine to renew and create new timer task?
> Potential race between renew and cancel in DelegationTokenRenwer
> -----------------------------------------------------------------
>
> Key: YARN-2919
> URL: https://issues.apache.org/jira/browse/YARN-2919
> Project: Hadoop YARN
> Issue Type: Bug
> Components: security
> Affects Versions: 2.6.0
> Reporter: Karthik Kambatla
> Assignee: Naganarasimha G R
> Priority: Critical
> Attachments: YARN-2919.20141209-1.patch
>
>
> YARN-2874 fixes a deadlock in DelegationTokenRenewer, but there is still a
> race because of which a renewal in flight isn't interrupted by a cancel.
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