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From "Jim Huang (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-5094) Show dead nodes information in dfsadmin -report
Date Wed, 21 Jan 2009 18:31:59 GMT
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
            Priority: Minor
             Fix For: 0.21.0



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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