Github user tnachen commented on a diff in the pull request:
https://github.com/apache/spark/pull/5144#discussion_r28045217
--- Diff:
core/src/main/scala/org/apache/spark/deploy/rest/SubmitRestProtocolRequest.scala
---
@@ -61,7 +61,7 @@ private[rest] class CreateSubmissionRequest extends
SubmitRestProtocolRequest {
assertProperty[Boolean](key, "boolean", _.toBoolean)
private def assertPropertyIsNumeric(key: String): Unit =
- assertProperty[Int](key, "numeric", _.toInt)
+ assertProperty[Double](key, "numeric", _.toDouble)
--- End diff --
This is actually for supporting fractional cores when providing
--driver-cores.
Cores in Spark are all integers, but it becomes quite limited when you want
launch multiple jobs as each job minimumally has to take at least 1 core (2 in
case of fine-grain mode). Making driver cores double you can then specifiy
--driver-cores 0.1 and it will just use 10% of a single core share.
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