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  1. Spark
  2. SPARK-12027

Spark on YARN won't ever ask for more executors than there were containers at time of context creation

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      Looking at YarnSchedulerBackend, it appears that totalExpectedExecutors is only ever set at startup.

      Based on my experience of running on EMR (and a quick browse through the code supports this), Spark will never ask for more executors than what this was set to.

      This means that if I add more nodes to my YARN cluster, Spark will never pick them up. This is bad. The whole point of using Spark on EMR/YARN is to be able to add or remove nodes to the cluster and have Spark "Do The Right Thing".

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            Unassigned Unassigned Assign to me
            retnuH Hunter Kelly
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