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From "Harsh J (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-1121) Allow HDFS client to measure distribution of blocks across devices for a specific DataNode
Date Thu, 10 May 2012 07:23:11 GMT

    [ https://issues.apache.org/jira/browse/HDFS-1121?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13272149#comment-13272149
] 

Harsh J commented on HDFS-1121:
-------------------------------

Isn't monitoring http://DNHOST:50075/jmx?qry=hadoop:service=DataNode,name=DataNodeInfo individually
sufficient for getting volume-info results, to measure disk-level balance for your clusters?

I don't think we should increase the DN heartbeat payload when this is already exposed at
the DN level?
                
> Allow HDFS client to measure distribution of blocks across devices for a specific DataNode
> ------------------------------------------------------------------------------------------
>
>                 Key: HDFS-1121
>                 URL: https://issues.apache.org/jira/browse/HDFS-1121
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: hdfs client
>            Reporter: Jeff Hammerbacher
>         Attachments: HDFS-1121.0.patch
>
>
> As discussed on the mailing list, it would be useful if the DfsClient could measure the
distribution of blocks across devices for an individual DataNode.

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