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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