[jira] [Created] (SPARK-25901) Barrier mode spawns a bunch of threads that get collected on gc

["yogesh garg (JIRA)" <ji...@apache.org>]

yogesh garg created SPARK-25901:
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             Summary: Barrier mode spawns a bunch of threads that get collected on gc
                 Key: SPARK-25901
                 URL: https://issues.apache.org/jira/browse/SPARK-25901
             Project: Spark
          Issue Type: Bug
          Components: Spark Core
    Affects Versions: 2.4.0
            Reporter: yogesh garg
         Attachments: Screen Shot 2018-10-31 at 11.57.25 AM.png, Screen Shot 2018-10-31 at 11.57.42 AM.png

After a barrier job is terminated (successfully or interrupted), the accompanying thread created with `Timer` in `BarrierTaskContext` shows in a waiting state until gc is called. We should probably have just one thread to schedule all such tasks, since they just log every 60 seconds.

Here's a screen shot of the threads growing with more tasks:

Here's a screen shot of constant number of threads with more tasks:



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