Github user aarondav commented on a diff in the pull request:
https://github.com/apache/spark/pull/3893#discussion_r22538331
--- Diff: core/src/main/scala/org/apache/spark/util/Utils.scala ---
@@ -701,7 +701,7 @@ private[spark] object Utils extends Logging {
}
}
- private var customHostname: Option[String] = None
+ private var customHostname: Option[String] =
sys.env.get("SPARK_LOCAL_HOSTNAME")
--- End diff --
Also note that SPARK_LOCAL_HOSTNAME is actually the DNS we want to
advertise internally, not externally, so I don't think it's the same as
SPARK_PUBLIC_DNS in DBC's case.
For instance, the external DNS is
ec2-x-x-x-x.us-west-2.compute.amazonaws.com and the internal one is
ip-y-y-y-y.us-west-2.compute.internal.
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