GitHub user suyanNone opened a pull request:
https://github.com/apache/spark/pull/8927
[SPARK-10796][CORE]Resubmit stage while lost task in Zombie TaskSets
We meet that problem in Spark 1.3.0, and I also check the latest Spark
code, and I think that problem still exist.
1. We know a running `ShuffleMapStage` will have multiple `TaskSet`: one
Active TaskSet, multiple Zombie TaskSet.
2. We think a running `ShuffleMapStage` is success only if its partition
are all process success, namely each taskâs MapStatus are all add into
`outputLocs`
3. MapStatus of running `ShuffleMapStage` may succeed by Zombie TaskSet1 /
Zombie TaskSet2 /..../ Active TaskSetN, and may some MapStatus only belong to
one TaskSet, and may be a Zombie TaskSet.
4. If lost a executor, it chanced that some lost-executor related MapStatus
are succeed by some Zombie TaskSet. In current logical, The solution to
resolved that lost MapStatus problem is, each TaskSet re-running that those
tasks which succeed in lost-executor: re-add into `TaskSet's pendingTasks`, and
re-add it paritions into `Stageâs pendingPartitions` . but it is useless if
that lost MapStatus only belong to Zombie TaskSet, it is Zombie, so will never
be scheduled his `pendingTasks`
5. The condition for resubmit stage is only if some task throws
`FetchFailedException`, but may the lost-executor just not empty any MapStatus
of parent Stage for one of running Stages, and itâs happen to that running
`Stage` was lost a MapStatus only belong to a ZombieTask. So if all Zombie
TaskSets are all processed his runningTasks and Active TaskSet are all
processed his pendingTask, then will removed by `TaskSchedulerImp`, then that
running Stage's pending partitions is still nonEmpty. it will hangs......
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/suyanNone/spark rerun-special
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/8927.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 #8927
----
commit 554c61f800c6c1b25b1002a7255569a9c38e4154
Author: hushan <[email protected]>
Date: 2015-09-24T09:49:22Z
rerun-specail
commit 3b4a683d23f951082df0b9d29dfa094683d235ea
Author: hushan <[email protected]>
Date: 2015-09-28T03:09:05Z
refine
commit f845f33563623a9f3d6858aba893ed8c75453403
Author: hushan <[email protected]>
Date: 2015-09-28T03:14:18Z
refine
commit 301da0a20c94084bc8f783cd0e087e63f07e2124
Author: hushan <[email protected]>
Date: 2015-09-28T03:18:46Z
refine
----
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