Ryan Williams created SPARK-4665:
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             Summary: Config value for setting yarn container overhead to a 
fraction of executor memory
                 Key: SPARK-4665
                 URL: https://issues.apache.org/jira/browse/SPARK-4665
             Project: Spark
          Issue Type: Improvement
          Components: YARN
            Reporter: Ryan Williams


Currently, the {{spark.yarn.executor.memoryOverhead}} config lets you specify a 
number of MB of "overhead" memory to allocate for each executor.

It turns out that it is more useful to set this to a specific fraction of the 
executor memory size; currently a lower-bound of 7% is the default.

This lower-bound percentage should be configurable, as well; I've heard rules 
of thumb that closer to 10% is desirable, and in general it makes more sense to 
be able to specify the fraction you're targeting than to specify an absolute 
number of MB.



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