Github user andrewor14 commented on the pull request:
https://github.com/apache/spark/pull/3607#issuecomment-67705762
> I think it is not correct to say the client mode's AM memory will use
--driver-memory if saprk.yarn.am.memory is not set. Actually it use the default
value(512m).
Wait what do you mean? Currently we read `--driver-memory` regardless of
the deploy mode and set `amMemory` to this value. I am arguing that this is not
correct for client mode. When `spark.yarn.am.memory` is set we are OK, but if
it's not set AND if `--driver-memory` is set then your AM will still use the
driver memory, which is not intended.
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