GitHub user zhaorongsheng opened a pull request:
https://github.com/apache/spark/pull/16389
[SPARK-18981][Core]The job hang problem when speculation is on
## What changes were proposed in this pull request?
The root cause of this issue is that `ExecutorAllocationListener` gets the
speculated task end info after the stage end event handling which let
`numRunningTasks = 0`. Then it let `numRunningTasks -= 1` so the
#numRunningTasks is negative. When calculate #maxNeeded in method
`maxNumExecutorsNeeded()`, the value may be 0 or negative. So
`ExecutorAllocationManager` does not request container and the job will be hung.
This PR changes the method `onTaskEnd()` in `ExecutorAllocationListener`.
When `stageIdToNumTasks` contains the taskEnd's stageId, let #numRunningTasks
minus 1.
## How was this patch tested?
This patch was tested in the method `test("SPARK-18981...)` of
ExecutorAllocationManagerSuite.scala.
Create two taskInfos and one of them is speculated task. After the stage
ending event, the speculated task ending event is posted to listener.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/zhaorongsheng/spark master
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/16389.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 #16389
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commit 1e191136581a22ed7cafd42e8b85e9a057b71171
Author: roncen.zhao <roncen.z...@vipshop.com>
Date: 2016-12-23T16:38:34Z
resolve the job hang problem when speculation is on
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