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https://issues.apache.org/jira/browse/SPARK-7413?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14531702#comment-14531702
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Josh Rosen commented on SPARK-7413:
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/cc [~kayousterhout], who's pretty familiar with the shuffle metrics code.
> Time to write shuffle spill files is not captured in ShuffleWriteMetrics
> ------------------------------------------------------------------------
>
> Key: SPARK-7413
> URL: https://issues.apache.org/jira/browse/SPARK-7413
> Project: Spark
> Issue Type: Bug
> Components: Shuffle
> Reporter: Josh Rosen
>
> In ExternalSorter's {{spillToMergeableFile()}} method, we pass
> ShuffleWriteMetrics instances to the disk writers, but discard the
> {{shuffleWriteTime}} metrics captured here. I think that we should account
> for this IO time, possibly by introducing new metrics to distinguish time
> spent writing spills vs. writing final shuffle output and extending the UI to
> break down the overall IO write time in terms of these two components.
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