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https://issues.apache.org/jira/browse/SPARK-3557?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14138993#comment-14138993
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Thomas Graves commented on SPARK-3557:
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This is a dup of SPARK-2872, although this has better description
> Yarn client config prioritization is backwards
> ----------------------------------------------
>
> Key: SPARK-3557
> URL: https://issues.apache.org/jira/browse/SPARK-3557
> Project: Spark
> Issue Type: Bug
> Components: YARN
> Affects Versions: 1.1.0
> Reporter: Andrew Or
>
> In YarnClientSchedulerBackend, we have:
> {code}
> if (System.getenv(envVar) != null) {
> arrayBuf += (optionName, System.getenv(envVar))
> } else if (sc.getConf.contains(sysProp)) {
> arrayBuf += (optionName, sc.getConf.get(sysProp))
> }
> {code}
> Elsewhere in Spark we try to honor Spark configs over environment variables.
> This was introduced as a fix for the Yarn app name (SPARK-1631), but this
> also changed the behavior for other configs. Perhaps we should special case
> this particular config and correct the prioritization order of the other
> configs.
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