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From "Jakob Homan (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-5094) Show dead nodes information in dfsadmin -report
Date Wed, 04 Feb 2009 19:03:59 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-5094?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jakob Homan updated HADOOP-5094:
--------------------------------

    Release Note: Update the output of dfsadmin -report to delineate the live and dead nodes,
as well as attempt to resolve the hostname of datanode ip addresses.  Minor formatting changes.
    Hadoop Flags: [Incompatible change, Reviewed]  (was: [Reviewed, Incompatible change])

> Show dead nodes information in dfsadmin -report
> -----------------------------------------------
>
>                 Key: HADOOP-5094
>                 URL: https://issues.apache.org/jira/browse/HADOOP-5094
>             Project: Hadoop Core
>          Issue Type: Improvement
>          Components: dfs
>    Affects Versions: 0.18.2
>            Reporter: Jim Huang
>            Assignee: Jakob Homan
>            Priority: Minor
>             Fix For: 0.21.0
>
>         Attachments: HADOOP-5094.patch, HADOOP-5094.patch, HADOOP-5094.patch
>
>
> As part of operations responsibility to bring back dead nodes, it will be good to have
a quick way to obtain a list of dead data nodes.  
> The current way is to scrape the namenode web UI page and parse that information, but
this creates load on the namenode.   
> In search of a less costly way, I noticed dfsadmin -report only reports data nodes with
State: "In Service" and "Decommission in progress" get listed.
> Asking for a cheap way to obtain a list of dead nodes.  
> In addition, can the following requests be reviewed for additional enhancement and changes
to dfsadmin -report.
> - Consistent formatting output in "Remaining raw bytes:" for the data nodes should have
a space between the exact value and the parenthesized value.
> Sample:
> Total raw bytes: 3842232975360 (3.49 TB)
> Remaining raw bytes: 146090593065(136.06 GB)
> Used raw bytes: 3240864964620 (2.95 TB)
> - Include the running version of Hadoop.  
> - What is the meaning of "Total effective bytes"?
> - Display the hostname instead of the IP address for the data node (toggle option?)

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