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https://issues.apache.org/jira/browse/HDFS-1905?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13034364#comment-13034364
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Suresh Srinivas commented on HDFS-1905:
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> Semantically, if this operation was successful, we should return true else we
> should return false.
Currently format() method returns aborted state instead of completion state.
Given that definition, format() method seems fine.
As regards to reusing clusterId - I feel format wipes out the previous state of
the namenode. Reusing cluster ID adds unnecessary Y/N questions and makes the
behaviors complicated to document.
> 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
>
> Attachments: HDFS-1905-1.patch
>
>
> 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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