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https://issues.apache.org/jira/browse/SPARK-22900?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sean Owen resolved SPARK-22900.
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Resolution: Not A Problem
> remove unnecessary restrict for streaming dynamic allocation
> ------------------------------------------------------------
>
> Key: SPARK-22900
> URL: https://issues.apache.org/jira/browse/SPARK-22900
> Project: Spark
> Issue Type: Improvement
> Components: DStreams
> Affects Versions: 2.3.0
> Reporter: sharkd tu
> Priority: Major
>
> When i set the conf `spark.streaming.dynamicAllocation.enabled=true`, the
> conf `num-executors` can not be set. As a result, it will allocate default 2
> executors and all receivers will be run on this 2 executors, there may not be
> redundant cpu cores for tasks. it will stuck all the time.
> in my opinion, we should remove unnecessary restrict for streaming dynamic
> allocation. we can set `num-executors` and
> `spark.streaming.dynamicAllocation.enabled=true` together. when application
> starts, each receiver will be run on an executor.
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