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https://issues.apache.org/jira/browse/SPARK-23635?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Saisai Shao resolved SPARK-23635.
---------------------------------
Resolution: Fixed
Fix Version/s: 2.4.0
Issue resolved by pull request 20799
[https://github.com/apache/spark/pull/20799]
> Spark executor env variable is overwritten by same name AM env variable
> -----------------------------------------------------------------------
>
> Key: SPARK-23635
> URL: https://issues.apache.org/jira/browse/SPARK-23635
> Project: Spark
> Issue Type: Bug
> Components: YARN
> Affects Versions: 2.3.0
> Reporter: Saisai Shao
> Assignee: Saisai Shao
> Priority: Minor
> Fix For: 2.4.0
>
>
> In the current Spark on YARN code, AM always will copy and overwrite its env
> variables to executors, so we cannot set different values for executors.
> To reproduce issue, user could start spark-shell like:
> {code:java}
> ./bin/spark-shell --master yarn-client --conf
> spark.executorEnv.SPARK_ABC=executor_val --conf
> spark.yarn.appMasterEnv.SPARK_ABC=am_val
> {code}
> Then check executor env variables by
> {code:java}
> sc.parallelize(1 to 1).flatMap \{ i => sys.env.toSeq
> }.collect.foreach(println)
> {code}
> You will always get {{am_val}} instead of {{executor_val}}. So we should not
> let AM to overwrite specifically set executor env variables.
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