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https://issues.apache.org/jira/browse/SPARK-25780?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16656355#comment-16656355
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Apache Spark commented on SPARK-25780:
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User '10110346' has created a pull request for this issue:
https://github.com/apache/spark/pull/22774
> Scheduling the tasks which have no higher level locality first
> --------------------------------------------------------------
>
> Key: SPARK-25780
> URL: https://issues.apache.org/jira/browse/SPARK-25780
> Project: Spark
> Issue Type: Improvement
> Components: Scheduler
> Affects Versions: 3.0.0
> Reporter: liuxian
> Priority: Minor
>
> For example:
> An application has two executors: (exe1, host1), (exe2,host2).
> And 3 tasks with locality: \{task0, Seq(TaskLocation("host1", "exec1"))},
> \{task1, Seq(TaskLocation("host1", "exec1"), TaskLocation("host2"))},
> \{task2, Seq(TaskLocation("host2")}
> If task0 is runing in exe1, when `allowedLocality` is NODE_LOCAL for exe2, it
> is better to schedule task2 fisrt, not task1, because task1 may be scheduled
> to exe1 later.
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