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From "Suresh Srinivas (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-2997) Expose status of DNs from the NN programmatically
Date Thu, 23 Feb 2012 16:22:49 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2997?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13214832#comment-13214832
] 

Suresh Srinivas commented on HDFS-2997:
---------------------------------------

Please see the JMX interface (available over http) FSNamesystemMBean.
                
> Expose status of DNs from the NN programmatically
> -------------------------------------------------
>
>                 Key: HDFS-2997
>                 URL: https://issues.apache.org/jira/browse/HDFS-2997
>             Project: Hadoop HDFS
>          Issue Type: New Feature
>          Components: name-node
>    Affects Versions: 0.23.1
>            Reporter: Aaron T. Myers
>
> Users who would like monitor the NN's view of DN health currently have two options: either
parse the NN web UI, or call the (private API) DFSClient#datanodeReport. We should expose
this in a nicer way, e.g. through metrics.

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