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https://issues.apache.org/jira/browse/HDFS-9427?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15183478#comment-15183478
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Xiao Chen commented on HDFS-9427:
---------------------------------

bq. I know nothing about KMS so not sure if it is safe to change the port 
number as Jonathan Hsieh proposed. I'll file a separate Jira for that and we 
can address the ephemeral ports here.
Looks like there's already HADOOP-12811 created for this. I can follow up on 
there and fix the kms default port as well. 
I don't think there's extra problems on changing the port on KMS, except for 
compatibility.

> 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-9427.001.patch, 
> HDFS-9427.002.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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