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https://issues.apache.org/jira/browse/SPARK-20776?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16016168#comment-16016168
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Ruslan Dautkhanov commented on SPARK-20776:
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Thank you [~joshrosen]. Would it be possible to backport this patch to Spark
2.1 as well?
> Fix JobProgressListener perf. problems caused by empty TaskMetrics
> initialization
> ---------------------------------------------------------------------------------
>
> Key: SPARK-20776
> URL: https://issues.apache.org/jira/browse/SPARK-20776
> Project: Spark
> Issue Type: Improvement
> Components: Spark Core
> Affects Versions: 2.2.0
> Reporter: Josh Rosen
> Assignee: Josh Rosen
> Fix For: 2.2.0
>
>
> In
> {code}
> ./bin/spark-shell --master=local[64]
> {code}
> I ran
> {code}
> sc.parallelize(1 to 100000, 100000).count()
> {code}
> and profiled the time spend in the LiveListenerBus event processing thread. I
> discovered that the majority of the time was being spent constructing empty
> TaskMetrics instances inside JobProgressListener. As I'll show in a PR, we
> can slightly simplify the code to remove the need to construct one empty
> TaskMetrics per onTaskSubmitted event.
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