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https://issues.apache.org/jira/browse/SPARK-18836?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15805042#comment-15805042
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Apache Spark commented on SPARK-18836:
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User 'squito' has created a pull request for this issue:
https://github.com/apache/spark/pull/16489
> Serialize Task Metrics once per stage
> -------------------------------------
>
> Key: SPARK-18836
> URL: https://issues.apache.org/jira/browse/SPARK-18836
> Project: Spark
> Issue Type: Improvement
> Components: Scheduler
> Reporter: Shivaram Venkataraman
> Assignee: Shivaram Venkataraman
> Fix For: 2.2.0
>
>
> Right now we serialize the empty task metrics once per task -- Since this is
> shared across all tasks we could use the same serialized task metrics across
> all tasks of a stage
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