[GitHub] spark issue #20799: [SPARK-23635][YARN] AM env variable should not overwrite...

[mridulm]

Github user mridulm commented on the issue:

    https://github.com/apache/spark/pull/20799
  
    Thanks for fixing this @jerryshao !
    LGTM
    Since there is a behavior change, +CC @tgravescs and @vanzin


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