Github user aarondav commented on a diff in the pull request:
https://github.com/apache/spark/pull/3469#discussion_r20916200
--- Diff:
core/src/main/scala/org/apache/spark/network/netty/SparkTransportConf.scala ---
@@ -29,15 +46,28 @@ object SparkTransportConf {
*/
def fromSparkConf(_conf: SparkConf, numUsableCores: Int = 0):
TransportConf = {
val conf = _conf.clone
- if (numUsableCores > 0) {
--- End diff --
We used to let the TransportContext decide how many cores to use if
numUsableCores were 0 -- since Spark is inserting this information about the
maximum it thinks it needs, I inserted the logic of using Runtime to
approximate the number of cores into here so we can also apply the max in this
case.
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