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https://issues.apache.org/jira/browse/SPARK-13688?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sean Owen resolved SPARK-13688.
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Resolution: Won't Fix
> Add option to use dynamic allocation even if spark.executor.instances is set.
> -----------------------------------------------------------------------------
>
> Key: SPARK-13688
> URL: https://issues.apache.org/jira/browse/SPARK-13688
> Project: Spark
> Issue Type: Improvement
> Components: YARN
> Affects Versions: 1.6.0
> Reporter: Ryan Blue
> Priority: Minor
>
> When both spark.dynamicAllocation.enabled and spark.executor.instances are
> set, dynamic resource allocation is disabled (see SPARK-9092). This is a
> reasonable default, but I think there should be a configuration property to
> override it because it isn't obvious to users that dynamic allocation and
> number of executors are mutually exclusive. We see users setting
> --num-executors because that looks like what they want: a way to get more
> executors.
> I propose adding a new boolean property,
> spark.dynamicAllocation.overrideNumExecutors, that makes dynamic allocation
> the default when both are set and uses --num-executors as the minimum number
> of executors.
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