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From "Harsh J (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-4508) Two minor improvements to the QJM Deployment docs
Date Sun, 17 Feb 2013 13:23:12 GMT
Harsh J created HDFS-4508:

             Summary: Two minor improvements to the QJM Deployment docs
                 Key: HDFS-4508
                 URL: https://issues.apache.org/jira/browse/HDFS-4508
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: documentation
    Affects Versions: 2.0.3-alpha
            Reporter: Harsh J
            Priority: Minor

Suggested by ML user Azurry, the docs at http://hadoop.apache.org/docs/current/hadoop-yarn/hadoop-yarn-site/HDFSHighAvailabilityWithQJM.html#Deployment_details
can be improved for two specific lines:

* If you have already formatted the NameNode, or are converting a non-HA-enabled cluster to
be HA-enabled, you should now copy over the contents of your NameNode metadata directories
to the other, unformatted NameNode by running the command "hdfs namenode -bootstrapStandby"
on the unformatted NameNode. Running this command will also ensure that the JournalNodes (as
configured by dfs.namenode.shared.edits.dir) contain sufficient edits transactions to be able
to start both NameNodes.
* If you are converting a non-HA NameNode to be HA, you should run the command "hdfs -initializeSharedEdits",
which will initialize the JournalNodes with the edits data from the local NameNode edits directories.

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