Apache Spark reassigned SPARK-23626:

    Assignee: Apache Spark

> Spark DAGScheduler scheduling performance hindered on JobSubmitted Event
> ------------------------------------------------------------------------
>                 Key: SPARK-23626
>                 URL: https://issues.apache.org/jira/browse/SPARK-23626
>             Project: Spark
>          Issue Type: Bug
>          Components: Scheduler
>    Affects Versions: 2.2.1
>            Reporter: Ajith S
>            Assignee: Apache Spark
>            Priority: Major
> DAGScheduler becomes a bottleneck in cluster when multiple JobSubmitted 
> events has to be processed as DAGSchedulerEventProcessLoop is single threaded 
> and it will block other tasks in queue like TaskCompletion.
> The JobSubmitted event is time consuming depending on the nature of the job 
> (Example: calculating parent stage dependencies, shuffle dependencies, 
> partitions) and thus it blocks all the events to be processed.
> I see multiple JIRA referring to this behavior
> https://issues.apache.org/jira/browse/SPARK-2647
> https://issues.apache.org/jira/browse/SPARK-4961
> Similarly in my cluster some jobs partition calculation is time consuming 
> (Similar to stack at SPARK-2647) hence it slows down the spark 
> DAGSchedulerEventProcessLoop which results in user jobs to slowdown, even if 
> its tasks are finished within seconds, as TaskCompletion Events are processed 
> at a slower rate due to blockage.

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