[jira] [Created] (SPARK-21656) spark dynamic allocation should not idle timeout executors when tasks still to run

["Jong Yoon Lee (JIRA)" <ji...@apache.org>]

Jong Yoon Lee created SPARK-21656:
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             Summary: spark dynamic allocation should not idle timeout executors when tasks still to run
                 Key: SPARK-21656
                 URL: https://issues.apache.org/jira/browse/SPARK-21656
             Project: Spark
          Issue Type: Improvement
          Components: Spark Core
    Affects Versions: 2.1.1
            Reporter: Jong Yoon Lee
            Priority: Minor
             Fix For: 2.1.1


Right now spark lets go of executors when they are idle for the 60s (or configurable time). I have seen spark let them go when they are idle but they were really needed. I have seen this issue when the scheduler was waiting to get node locality but that takes longer then the default idle timeout. In these jobs the number of executors goes down really small (less than 10) but there are still like 80,000 tasks to run.
We should consider not allowing executors to idle timeout if they are still needed according to the number of tasks to be run.



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