liuxian created SPARK-25780:
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Summary: 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
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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