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Posted to issues@spark.apache.org by "wuyi (Jira)" <ji...@apache.org> on 2020/08/03 05:54:00 UTC

[jira] [Created] (SPARK-32518) CoarseGrainedSchedulerBackend.maxNumConcurrentTasks should consider all kinds of resources

wuyi created SPARK-32518:
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             Summary: CoarseGrainedSchedulerBackend.maxNumConcurrentTasks should consider all kinds of resources
                 Key: SPARK-32518
                 URL: https://issues.apache.org/jira/browse/SPARK-32518
             Project: Spark
          Issue Type: Bug
          Components: Spark Core
    Affects Versions: 3.0.0
            Reporter: wuyi


Currently, CoarseGrainedSchedulerBackend.maxNumConcurrentTasks only considers the CPU for the max concurrent tasks. This can cause the application to hang when a barrier stage requires extra custom resources but the cluster doesn't have enough corresponding resources. Because, without the checking for other custom resources in maxNumConcurrentTasks, the barrier stage can be submitted to the TaskSchedulerImpl. But the TaskSchedulerImpl can not launch tasks for the barrier stage due to the insufficient task slots calculated by calculateAvailableSlots(which does check all kinds of resources). 



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