Github user jiangxb1987 commented on a diff in the pull request: https://github.com/apache/spark/pull/20327#discussion_r165193521 --- Diff: core/src/main/scala/org/apache/spark/deploy/SparkSubmit.scala --- @@ -744,7 +744,9 @@ object SparkSubmit extends CommandLineUtils with Logging { } // Ignore invalid spark.driver.host in cluster modes. - if (deployMode == CLUSTER) { + if (isYarnCluster) { + sparkConf.set("spark.driver.host", "${env:NM_HOST}") --- End diff -- This actually requires `spark.sql.variable.substitute` set to `true`, though by default it is, if some user accidentally changes it, the code won't work.
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