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https://issues.apache.org/jira/browse/TEZ-2059?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14321060#comment-14321060
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Hitesh Shah commented on TEZ-2059:
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[~zjffdu] I believe this was added as there were spurious errors in the logs
generated as there was no registered handler for task events generated by the
vertex during the unit tests.
> Remove TaskEventHandler in TestDAGImpl
> --------------------------------------
>
> Key: TEZ-2059
> URL: https://issues.apache.org/jira/browse/TEZ-2059
> Project: Apache Tez
> Issue Type: Bug
> Reporter: Jeff Zhang
> Assignee: Jeff Zhang
> Priority: Minor
> Attachments: TEZ-2059-1.patch
>
>
> There's one TaskEventHandler and TaskEventDispatcher in TestDAGImpl, and both
> of them are registered in Dispatcher as handler of TaskEvent.
> TaskEventHandler should not be used.
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