Show dead nodes information in dfsadmin -report
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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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