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https://issues.apache.org/jira/browse/SPARK-4921?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16021410#comment-16021410
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Imran Rashid commented on SPARK-4921:
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I want to point out that this also results in really confusing behavior in the
event logs and the UI -- no pref tasks show up as "Process local" in the UI.
This doesn't adversely effect scheduling, but is very confusing for the user.
I know this is really old, but just curious [~CodingCat] if you remember why
this was done in SPARK-2294.
> TaskSetManager mistakenly returns PROCESS_LOCAL for NO_PREF tasks
> -----------------------------------------------------------------
>
> Key: SPARK-4921
> URL: https://issues.apache.org/jira/browse/SPARK-4921
> Project: Spark
> Issue Type: Bug
> Components: Spark Core
> Affects Versions: 1.2.0
> Reporter: Xuefu Zhang
> Attachments: NO_PREF.patch
>
>
> During research for HIVE-9153, we found that TaskSetManager returns
> PROCESS_LOCAL for NO_PREF tasks, which may caused performance degradation.
> Changing the return value to NO_PREF, as demonstrated in the attached patch,
> seemingly improves the performance.
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