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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-1636) If dfs.name.dir points to an empty dir, namenode format shouldn't require confirmation
Date Wed, 25 May 2011 16:44:48 GMT

    [ https://issues.apache.org/jira/browse/HDFS-1636?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13039195#comment-13039195
] 

Todd Lipcon commented on HDFS-1636:
-----------------------------------

Hey Harsh. There's now an issue where the NN will throw an NPE if one of the directories exists
but isn't accessible. eg I did "chmod 000 /my/namedir" and run namenode -format and got:

11/05/25 09:43:32 ERROR namenode.NameNode: java.lang.NullPointerException
        at org.apache.hadoop.hdfs.server.namenode.NameNode.format(NameNode.java:1487)
        at org.apache.hadoop.hdfs.server.namenode.NameNode.createNameNode(NameNode.java:1671)
        at org.apache.hadoop.hdfs.server.namenode.NameNode.main(NameNode.java:1730)

Consider looking at HADOOP-7322 for a utility method on its way into trunk to deal with this.

> If dfs.name.dir points to an empty dir, namenode format shouldn't require confirmation
> --------------------------------------------------------------------------------------
>
>                 Key: HDFS-1636
>                 URL: https://issues.apache.org/jira/browse/HDFS-1636
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: name-node
>    Affects Versions: 0.23.0
>            Reporter: Todd Lipcon
>            Assignee: Harsh J Chouraria
>            Priority: Minor
>             Fix For: 0.23.0
>
>         Attachments: HDFS-1636.r1.diff, HDFS-1636.r2.diff
>
>
> Right now, running namenode -format when dfs.name.dir is configured to a dir which exists
but is empty still asks for confirmation. This is unnecessary since it isn't blowing away
any real data.

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