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https://issues.apache.org/jira/browse/YARN-4593?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15098825#comment-15098825
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Steve Loughran commented on YARN-4593:
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I don't see why we need this to be synchronized (it's that way in branch-205);
the actual type is {{volatile}} so access is thread safe anyway.
> Deadlock in AbstractService.getConfig()
> ---------------------------------------
>
> Key: YARN-4593
> URL: https://issues.apache.org/jira/browse/YARN-4593
> Project: Hadoop YARN
> Issue Type: Bug
> Components: yarn
> Affects Versions: 2.7.2
> Environment: AM restarting on kerberized cluster
> Reporter: Steve Loughran
> Assignee: Steve Loughran
>
> SLIDER-1052 has found a deadlock which can arise in it during AM restart.
> Looking at the thread trace, one of the blockages is actually
> {{AbstractService.getConfig()}} —this is synchronized and so blocked.
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