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https://issues.apache.org/jira/browse/HDFS-1905?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13032556#comment-13032556
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Matt Foley commented on HDFS-1905:
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bq. What is a use case in which a cluster ID would be manually specified?
I can imagine some nasty manual recovery process where you might wish to
initialize a clean environment with a specified clusterId, followed by manual
injection of data recovered from image and edits files. Not something I would
want to do :-) but probably should be supported.
However, I agree "-format" without other args should create a new cid if no old
cid is available. A prompt would be appropriate, same as currently done with
re-use of an available old cid.
> Improve the usability of namenode -format
> ------------------------------------------
>
> Key: HDFS-1905
> URL: https://issues.apache.org/jira/browse/HDFS-1905
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: name-node
> Affects Versions: 0.23.0
> Reporter: Bharath Mundlapudi
> Assignee: Bharath Mundlapudi
> Priority: Minor
> Fix For: 0.23.0
>
>
> While setting up 0.23 version based cluster, i ran into this issue. When i
> issue a format namenode command, which got changed in 23, it should let the
> user know to how to use this command in case where complete options were not
> specified.
> ./hdfs namenode -format
> I get the following error msg, still its not clear what and how user should
> use this command.
> 11/05/09 15:36:25 ERROR namenode.NameNode:
> java.lang.IllegalArgumentException: Format must be provided with clusterid
> at
> org.apache.hadoop.hdfs.server.namenode.NameNode.format(NameNode.java:1483)
> at
> org.apache.hadoop.hdfs.server.namenode.NameNode.createNameNode(NameNode.java:1623)
> at
> org.apache.hadoop.hdfs.server.namenode.NameNode.main(NameNode.java:1689)
>
> The usability of this command can be improved.
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