Github user mridulm commented on the pull request:
https://github.com/apache/spark/pull/663#issuecomment-42356011
That sounds reasonable approach - will know more when PR is updated.
The initial idea behind separate Thread for each was exactly that - we
expected low hundreds as upper limit (at that time); we needed to send request
to RM asap while not being sure how long the rpc can take. This is, clearly,
suboptimal leading to unbounded increase in threads during initial allocation
burst.
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