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https://issues.apache.org/jira/browse/TEZ-1259?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14054028#comment-14054028
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Hitesh Shah commented on TEZ-1259:
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This should be fine as long as the necessary event ( vertex started ) is sent
to history to track the required recovery related state change.
> Vertex should move to RUNNING state without generating an extra VERTEX_START
> event
> ----------------------------------------------------------------------------------
>
> Key: TEZ-1259
> URL: https://issues.apache.org/jira/browse/TEZ-1259
> Project: Apache Tez
> Issue Type: Improvement
> Reporter: Siddharth Seth
>
> Currently, we end up generating a VERTEX_START event targeted at the same
> vertex when a vertex is ready to start. Instead, the Vertex can directly move
> to started state - which prevents unnecessary event queueing.
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