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https://issues.apache.org/jira/browse/TEZ-3719?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16005429#comment-16005429
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Gopal V commented on TEZ-3719:
------------------------------
One of these getProgress() calls is coming from the AM-RM heartbeat, to display
in the RM UI progress bar.
Lowering the AM heartbeat to the RM would also fix part of the scalability.
> 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.wip.patch,
> tez_computeProgress_waiting_for_lock.png
>
>
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