Github user JoshRosen commented on a diff in the pull request:
https://github.com/apache/spark/pull/3112#discussion_r20133547
--- Diff: core/src/main/scala/org/apache/spark/SparkContext.scala ---
@@ -206,6 +202,14 @@ class SparkContext(config: SparkConf) extends
SparkStatusAPI with Logging {
if (master == "yarn-client") System.setProperty("SPARK_YARN_MODE",
"true")
+ // Set Spark driver host and port system properties. Ignore host setting
in all cluster modes.
+ if (master.contains("cluster")) {
--- End diff --
Substring search seems like a dangerous / brittle way to detect whether
we're running in a cluster deployment mode, since it's plausible that a user
might have a master hostname which also contains cluster, e.g.
"spark://testcluster".
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