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https://issues.apache.org/jira/browse/YARN-1730?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13910612#comment-13910612
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Billie Rinaldi commented on YARN-1730:
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I don't think using hold count will be sufficient. The hold count only returns
the number of holds that have been obtained by the current thread. So as soon
as the current thread is done with the lock, it would drop the lock from the
lock map, which is not what we want.
> Leveldb timeline store needs simple write locking
> -------------------------------------------------
>
> Key: YARN-1730
> URL: https://issues.apache.org/jira/browse/YARN-1730
> Project: Hadoop YARN
> Issue Type: Sub-task
> Reporter: Billie Rinaldi
> Assignee: Billie Rinaldi
> Attachments: YARN-1730.1.patch, YARN-1730.2.patch
>
>
> The actual data writes are performed atomically in a batch, but a lock should
> be held while identifying a start time for the entity, which precedes every
> write.
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