Github user AhyoungRyu commented on the issue:
https://github.com/apache/zeppelin/pull/1636
The PR title says "Add note on configuration of **spark-yarn mode** on
docker",
> **Note 2:** `sparkmaster` hostname used to run docker containers below
should be defined in your `/etc/hosts`."
but this sentence is currently added under "Spark standalone mode" section.
Is it intended? If not, I think it needs to be moved to
[here](https://github.com/khalidhuseynov/incubator-zeppelin/blob/9e4ad6889725efbc6ee9688247ea0bc4ccf1e0b3/docs/install/spark_cluster_mode.md#spark-on-yarn-mode)
I guess :)
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