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https://issues.apache.org/jira/browse/TEZ-3719?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16008235#comment-16008235
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Jonathan Eagles commented on TEZ-3719:
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+1.
> DAGImpl.computeProgress slows down dispatcher and ipc threads
> -------------------------------------------------------------
>
> Key: TEZ-3719
> URL: https://issues.apache.org/jira/browse/TEZ-3719
> Project: Apache Tez
> Issue Type: Bug
> Reporter: Rajesh Balamohan
> Assignee: Gopal V
> Attachments: dispatcher_holding_lock.png, TEZ-3719.1.patch,
> TEZ-3719.2.patch, TEZ-3719.3.patch, TEZ-3719.wip.patch,
> tez_computeProgress_waiting_for_lock.png
>
>
> The Vertex readLock is held while computing progress, which prevents
> scheduling of tasks from happening on that vertex (which needs a writeLock).
> Making the locked section do as little work as possible would speedup the AM.
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