Github user sryza commented on the pull request:

    https://github.com/apache/spark/pull/3806#issuecomment-68669501
  
    @XuTingjun ah, that's correct.  Looking more closely, my confusion was 
stemming from some existing weirdness, which is that setting the 
"spark.driver.memory" property will set the application master memory even in 
client mode.  Also, that passing "--driver-memory" as part of the YARN code's 
ClientArguments (but not to `spark-submit`) will do this as well.
    
    My opinion is that we should fix those, though I suppose it could be argued 
that it breaks backwards compatibility?



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