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https://issues.apache.org/jira/browse/SPARK-16382?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15362798#comment-15362798
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Ryan Blue commented on SPARK-16382:
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[~tgraves], what do you think the right behavior is here?
> YARN - Dynamic allocation with spark.executor.instances should increase max
> executors.
> --------------------------------------------------------------------------------------
>
> Key: SPARK-16382
> URL: https://issues.apache.org/jira/browse/SPARK-16382
> Project: Spark
> Issue Type: Bug
> Components: YARN
> Reporter: Ryan Blue
>
> SPARK-13723 changed the behavior of dynamic allocation when
> {{--num-executors}} ({{spark.executor.instances}}) is set. Rather than
> turning off dynamic allocation, the value is used as the initial number of
> executors. This did not change the behavior of
> {{spark.dynamicAllocation.maxExecutors}}. We've noticed that some users set
> {{--num-executors}} higher than the max and the expectation is that the max
> increases.
> I think that either max should be increased, or Spark should fail and
> complain that the executors requested is higher than the max.
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