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From "Daryn Sharp (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-360) Allow apps to concurrently register tokens for renewal
Date Mon, 28 Jan 2013 15:49:13 GMT

    [ https://issues.apache.org/jira/browse/YARN-360?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13564354#comment-13564354
] 

Daryn Sharp commented on YARN-360:
----------------------------------

Findbugs is false positive.  {{Timer}} class is thread-safe, but it's instantiated and cancelled
in sync'ed methods so findbugs is assuming that scheduling tasks should be sync'ed too.

Test failure appears unrelated, but looking into it. 
                
> Allow apps to concurrently register tokens for renewal
> ------------------------------------------------------
>
>                 Key: YARN-360
>                 URL: https://issues.apache.org/jira/browse/YARN-360
>             Project: Hadoop YARN
>          Issue Type: Bug
>    Affects Versions: 0.23.3, 3.0.0, 2.0.0-alpha
>            Reporter: Daryn Sharp
>            Priority: Critical
>         Attachments: YARN-360.patch
>
>
> {{DelegationTokenRenewer#addApplication}} has an unnecessary {{synchronized}} keyword.
 This serializes job submissions and can add unnecessary latency and/or hang all submissions
if there are problems renewing the token.

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