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https://issues.apache.org/jira/browse/HDFS-5141?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Work on HDFS-5141 started by Andrew Wang.

> Add cache status information to datanode heartbeat
> --------------------------------------------------
>
>                 Key: HDFS-5141
>                 URL: https://issues.apache.org/jira/browse/HDFS-5141
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: datanode, namenode
>    Affects Versions: HDFS-4949
>            Reporter: Andrew Wang
>            Assignee: Andrew Wang
>         Attachments: hdfs-5141-1.patch
>
>
> We need to propagate the cache capacity and cache remaining from the datanode 
> to the namenode to make appropriate caching decisions.

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