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https://issues.apache.org/jira/browse/HADOOP-5094?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12668987#action_12668987
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Jakob Homan commented on HADOOP-5094:
-------------------------------------
At the moment there is no way to query the server version via the client
protocol, and that ability seems beyond the scope of this JIRA, so that feature
should probably wait. HADOOP-4368 is currently dealing with the information
included in this report and it may be worthwhile to include the server version
in that work. I'll open another JIRA for this.
> Show dead nodes information in dfsadmin -report
> -----------------------------------------------
>
> Key: HADOOP-5094
> URL: https://issues.apache.org/jira/browse/HADOOP-5094
> Project: Hadoop Core
> Issue Type: New Feature
> Components: dfs
> Affects Versions: 0.18.2
> Reporter: Jim Huang
> Assignee: Jakob Homan
> Priority: Minor
> Fix For: 0.21.0
>
> Attachments: 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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