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https://issues.apache.org/jira/browse/HDFS-9427?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15166323#comment-15166323
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Jonathan Hsieh commented on HDFS-9427:
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Here's another to consider: the hadoop-kms port. It was brought up on
HBASE-10123 that it uses 16000 as default (and clashes with hbase currently)
this line indicates that 16000 is the default -- likely a search for that ENV
variable will find where it is set by default in the code or confs.
https://github.com/apache/hadoop/blob/trunk/hadoop-common-project/hadoop-kms/src/main/conf/kms-env.sh#L25
> HDFS should not default to ephemeral ports
> ------------------------------------------
>
> Key: HDFS-9427
> URL: https://issues.apache.org/jira/browse/HDFS-9427
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: datanode, hdfs-client, namenode
> Affects Versions: 3.0.0
> Reporter: Arpit Agarwal
> Assignee: Xiaobing Zhou
> Priority: Critical
> Labels: Incompatible
> Attachments: HDFS-9427.000.patch
>
>
> HDFS defaults to ephemeral ports for the some HTTP/RPC endpoints. This can
> cause bind exceptions on service startup if the port is in use.
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