[jira] [Created] (SPARK-3174) Under YARN, add and remove executors based on load

["Sandy Ryza (JIRA)" <ji...@apache.org>]

Sandy Ryza created SPARK-3174:
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             Summary: Under YARN, add and remove executors based on load
                 Key: SPARK-3174
                 URL: https://issues.apache.org/jira/browse/SPARK-3174
             Project: Spark
          Issue Type: Improvement
          Components: YARN
    Affects Versions: 1.0.2
            Reporter: Sandy Ryza


A common complaint with Spark in a multi-tenant environment is that applications have a fixed allocation that doesn't grow and shrink with their resource needs.  We're blocked on YARN-1197 for dynamically changing the resources within executors, but we can still allocate and discard whole executors.

I think it would be useful to have some heuristics that
* Request more executors when many pending tasks are building up
* Request more executors when RDDs can't fit in memory
* Discard executors when few tasks are running / pending and there's not much in memory

Bonus points: migrate blocks from executors we're about to discard to executors with free space.



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