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https://issues.apache.org/jira/browse/SPARK-10796?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Apache Spark reassigned SPARK-10796:
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Assignee: (was: Apache Spark)
> The Stage taskSets may are all removed while stage still have pending
> partitions after having lost some executors
> -----------------------------------------------------------------------------------------------------------------
>
> Key: SPARK-10796
> URL: https://issues.apache.org/jira/browse/SPARK-10796
> Project: Spark
> Issue Type: Bug
> Components: Scheduler
> Affects Versions: 1.3.0
> Reporter: SuYan
> Priority: Minor
>
> 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 task‘s *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 *Stage‘s 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 it‘s 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......
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