Github user wulei-bj-cn commented on the pull request:
https://github.com/apache/spark/pull/8533#issuecomment-138171655
@CodingCat It's quite smart to set SPARK_LOCAL_HOSTNAME=`hostname` to save
the efforts and energy I mentioned in earlier comments when it comes to
deployment and maintenance. Yet, there are still chances where people/users
forgot or just omitted this setting for some reason, since people tend to
configure as less as possible. So we should still provide proper locality
levels even when they have no idea about the existence of this setting, to make
Spark more user-friendly. Am I correct or just over-reacting ? :)
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