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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-1905) Improve the usability of namenode -format
Date Thu, 12 May 2011 22:31:47 GMT

    [ https://issues.apache.org/jira/browse/HDFS-1905?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13032719#comment-13032719

Todd Lipcon commented on HDFS-1905:

I agree that cluster ID is a nicer construct than namespace ID. But it doesn't replace it,
since we still have the namespaceID in NNStorage.

Perhaps a nice compromise would be the following:
- "hadoop namenode -format" gains a required argument for cluster ID. ie "hadoop namenode
-format mycluster". If you don't specify this it should print usage info.
- "hadoop namenode -upgrade" by default will carry over the old namespaceID as the new cluster's
cluster ID? Alternatively one may provide a cluster ID with "hadoop namenode -upgrade -clusterid

Another question: if cluster ID is meant to be a user-visible "nice name" -- how can one rename
a cluster?

> 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
> 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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