[jira] [Created] (SPARK-21115) If the cores left is less than the coresPerExecutor,the cores left will not be allocated, so it should not to check in every schedule

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

eaton created SPARK-21115:
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             Summary: If the cores left is less than the coresPerExecutor,the cores left will not be allocated, so it should not to check in every schedule
                 Key: SPARK-21115
                 URL: https://issues.apache.org/jira/browse/SPARK-21115
             Project: Spark
          Issue Type: Improvement
          Components: Spark Core
    Affects Versions: 2.1.1
            Reporter: eaton
            Priority: Minor


If we start an app with the param --total-executor-cores=4 and spark.executor.cores=3, the cores left is always 1, so it will try to allocate executors in the function org.apache.spark.deploy.master.startExecutorsOnWorkers in every schedule.
Another question is, is it will be better to allocate another executor with 1 core for the cores left.



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