Github user bdzimmer commented on the pull request:
https://github.com/apache/spark/pull/7345#issuecomment-120533209
I was just surprised when I started up a standalone mode Spark 1.4.0
cluster for the first time (with similar configuration as I've used in the past
with Spark 1.0 - 1.3.1) and got IP addresses but no hostnames in the web UI. I
suppose this is somewhat cosmetic, but it is useful to have hostnames
identified correctly when working with a cluster and debugging jobs, and it
seems like it would be desirable for this to work automatically when using
standalone mode and start-slaves.sh.
It used to work in previous versions. And it seems like using
SPARK_LOCAL_HOSTNAME to configure hostnames would require different
spark-env.sh configurations between the different workers, which also wasn't
previously required.
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