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From "Robert Chansler (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-5094) Show dead nodes information in dfsadmin -report
Date Thu, 08 Oct 2009 04:27:31 GMT

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

Robert Chansler updated HADOOP-5094:
------------------------------------

    Release Note: Changed df dfsadmin -report to list live and dead nodes, and attempt to
resolve the hostname of datanode ip addresses.   (was: 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.)

Editorial pass over all release notes prior to publication of 0.21.

> Show dead nodes information in dfsadmin -report
> -----------------------------------------------
>
>                 Key: HADOOP-5094
>                 URL: https://issues.apache.org/jira/browse/HADOOP-5094
>             Project: Hadoop Common
>          Issue Type: Improvement
>    Affects Versions: 0.18.2
>            Reporter: Jim Huang
>            Assignee: Jakob Homan
>            Priority: Minor
>             Fix For: 0.21.0
>
>         Attachments: DfsAdminDeadNode_testCases.html, 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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