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https://issues.apache.org/jira/browse/HDFS-5120?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13757481#comment-13757481
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Brandon Li commented on HDFS-5120:
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[~cmccabe]: it could make the command easier to use if command help message 
provides a bit more help info for the "mode" and "weight". I found the javadoc 
explaining "mode" but didn't find that of "weight". 
                
> add command-line support for manipulating cache pools
> -----------------------------------------------------
>
>                 Key: HDFS-5120
>                 URL: https://issues.apache.org/jira/browse/HDFS-5120
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: datanode, namenode
>    Affects Versions: HDFS-4949
>            Reporter: Colin Patrick McCabe
>            Assignee: Colin Patrick McCabe
>         Attachments: HDFS-5120-caching.001.patch
>
>
> We should add command-line support for creating, removing, and listing cache 
> directives and manipulating cache pools.

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