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From "Aaron T. Myers (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-3102) Add CLI tool to initialize the shared-edits dir
Date Wed, 04 Apr 2012 02:52:22 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3102?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13245981#comment-13245981
] 

Aaron T. Myers commented on HDFS-3102:
--------------------------------------

I should also mention that I tested this manually by:

# Formatting an HA NN.
# Removing the shared dir.
# Confirming the NN wouldn't start.
# Running `hdfs namenode -initializeSharedEdits' on that NN.
# Confirming that the NN would start.
# Transitioning the NN to active.
# Running `hdfs namenode -bootstrapStandby' on the other NN.
# Starting the second NN.
# Confirming that failovers could proceed back and forth between the two NNs.
                
> Add CLI tool to initialize the shared-edits dir
> -----------------------------------------------
>
>                 Key: HDFS-3102
>                 URL: https://issues.apache.org/jira/browse/HDFS-3102
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: ha, name-node
>    Affects Versions: 0.24.0, 2.0.0
>            Reporter: Todd Lipcon
>            Assignee: Aaron T. Myers
>         Attachments: HDFS-3102.patch
>
>
> Currently in order to make a non-HA NN HA, you need to initialize the shared edits dir.
This can be done manually by cping directories around. It would be preferable to add a "namenode
-initializeSharedEdits" command to achieve this same effect.

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