GitHub user ivoson opened a pull request:
https://github.com/apache/spark/pull/20244
[SPARK-23053][CORE] taskBinarySerialization and task partitions calculate
in DagScheduler.submitMissingTasks should keep the same RDD checkpoint status
â¦d is the same when calculate taskSerialization and task partitions
Change-Id: Ib9839ca552653343d264135c116742effa6feb60
## What changes were proposed in this pull request?
When we run concurrent jobs using the same rdd which is marked to do
checkpoint. If one job has finished running the job, and start the process of
RDD.doCheckpoint, while another job is submitted, then submitStage and
submitMissingTasks will be called. In
[submitMissingTasks](https://github.com/apache/spark/blob/master/core/src/main/scala/org/apache/spark/scheduler/DAGScheduler.scala#L961),
will serialize taskBinaryBytes and calculate task partitions which are both
affected by the status of checkpoint, if the former is calculated before
doCheckpoint finished, while the latter is calculated after doCheckpoint
finished, when run task, rdd.compute will be called, for some rdds with
particular partition type such as
[MapWithStateRDD](https://github.com/apache/spark/blob/master/streaming/src/main/scala/org/apache/spark/streaming/rdd/MapWithStateRDD.scala)
who will do partition type cast, will get a ClassCastException because the
part params is actually a CheckpointRDDPartition.
## How was this patch tested?
the exist uts and also add a test case in DAGScheduerSuite to show the
exception case.
Please review http://spark.apache.org/contributing.html before opening a
pull request.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/ivoson/spark branch-taskpart-mistype
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/20244.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 #20244
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commit 0dea573e9e724d591803b73f678e14f94e0af447
Author: huangtengfei <huangtengfei@...>
Date: 2018-01-12T02:53:29Z
submitMissingTasks should make sure the checkpoint status of stage.rdd is
the same when calculate taskSerialization and task partitions
Change-Id: Ib9839ca552653343d264135c116742effa6feb60
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