GitHub user jinxing64 opened a pull request:
https://github.com/apache/spark/pull/17603
[SPARK-20288] Avoid generating the MapStatus by stageId in
BasicSchedulerIntegrationSuite
## What changes were proposed in this pull request?
ShuffleId is determined before job submitted. But it's hard to predict
stageId by shuffleId.
Stage is created in DAGScheduler(
https://github.com/apache/spark/blob/master/core/src/main/scala/org/apache/spark/scheduler/DAGScheduler.scala#L381),
but the order is n
ot determined.
I added a log(println(s"Creating ShufflMapStage-$id on
shuffle-${shuffleDep.shuffleId}")) after
(https://github.com/apache/spark/blob/master/core/src/main/scala/org/apache/spark/scheduler/DAGScheduler.scala#L331),
when testing BasicSchedulerIntegrationSuite:"multi-stage job". It will print:
Creating ShufflMapStage-0 on shuffle-0
Creating ShufflMapStage-1 on shuffle-2
Creating ShufflMapStage-2 on shuffle-1
Creating ShufflMapStage-3 on shuffle-3
or
Creating ShufflMapStage-0 on shuffle-1
Creating ShufflMapStage-1 on shuffle-3
Creating ShufflMapStage-2 on shuffle-0
Creating ShufflMapStage-3 on shuffle-2
It might be better to avoid generating the MapStatus by stageId.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/jinxing64/spark SPARK-20288
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/17603.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #17603
----
commit ea883f5d2b4bd63fae1f46bfe6ba78b352a894dc
Author: jinxing <jinxing6...@126.com>
Date: 2017-04-11T06:16:31Z
[SPARK-20288] Avoid generating the MapStatus by stageId in
BasicSchedulerIntegrationSuite
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