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From "Tanping Wang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-1873) Federation Cluster Management Web Console
Date Sun, 01 May 2011 04:57:03 GMT

    [ https://issues.apache.org/jira/browse/HDFS-1873?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13027426#comment-13027426

Tanping Wang commented on HDFS-1873:

The web console talks to each name node through jmx and collect statistics.  It can sit on
any third party box to monitor cluster status.  Connecting to any of the name nodes, the same
content is returned.  A MXBean sits on every name node to expose statistics through JMX. 
No communication between name nodes are required. 
In case of one or more name node is not connected.  They are listed under unreported name
nodes with their exceptions encountered.  If none of the name nodes are available, exceptions
encountered are also listed on the web page. 

Cluster decommission page monitors decommission status of data nodes in the cluster.  Decommission
status of a data node is decommission in progress, or decommissioned.  An over-all decommission
status is provided per name space by consolidating all the data nodes status in the same name
space.  If a data node is in service, it is not included in the decommission report page.

> Federation Cluster Management Web Console
> -----------------------------------------
>                 Key: HDFS-1873
>                 URL: https://issues.apache.org/jira/browse/HDFS-1873
>             Project: Hadoop HDFS
>          Issue Type: New Feature
>    Affects Versions: 0.23.0
>            Reporter: Tanping Wang
>            Assignee: Tanping Wang
>             Fix For: 0.23.0
>         Attachments: ClusterSummary.png, Decommission.png, HDFS-1873.patch
> The Federation cluster management console provides 
> # Cluster summary information that shows overall cluster utilization.  A list of the
name nodes that reports the used space, files and directories, blocks, live and dead datanodes

> of each name space.
> # decommissioning status of all the data nodes who are decommissioning in process or

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