Github user WangTaoTheTonic commented on the pull request:
https://github.com/apache/spark/pull/4018#issuecomment-70236672
I tested with this patch, with no specified configs in yarn client and
cluster mode AM used 1 vCore.
With `spark.driver.cores=3` and `spark.yarn.am.cores=4`, in client mode AM
used 4 vCores, while in cluster mode it is 3.
With `--driver-cores 5`, in cluster mode AM used 5 vCores.
If we have no problems with the name, I think it is to go.
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