t oo created SPARK-30560:
----------------------------

             Summary: allow driver to consume a fractional core
                 Key: SPARK-30560
                 URL: https://issues.apache.org/jira/browse/SPARK-30560
             Project: Spark
          Issue Type: Improvement
          Components: Scheduler
    Affects Versions: 2.4.4
            Reporter: t oo


see 
https://stackoverflow.com/questions/56781927/apache-spark-standalone-scheduler-why-does-driver-need-a-whole-core-in-cluste

this is to make it possible for a driver to use 0.2 cores rather than a whole 
core



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