Ryan Blue created SPARK-13688:
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Summary: 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: Bug
Reporter: Ryan Blue
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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