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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-3438) BootstrapStandby should not require a rollEdits on active node
Date Thu, 17 May 2012 19:52:08 GMT
Todd Lipcon created HDFS-3438:
---------------------------------

             Summary: BootstrapStandby should not require a rollEdits on active node
                 Key: HDFS-3438
                 URL: https://issues.apache.org/jira/browse/HDFS-3438
             Project: Hadoop HDFS
          Issue Type: Improvement
          Components: ha
    Affects Versions: 2.0.0
            Reporter: Todd Lipcon
            Assignee: Todd Lipcon


Currently, BootstrapStandby uses a rollEdits() call on the active NN in order to determine
the most recent checkpoint and transaction ID. However, this means that you cannot bootstrap
a standby when the active NN is in safe mode -- i.e you have to start the whole cluster before
you can bootstrap a new standby. This makes the workflow to convert an existing cluster to
HA more complicated. We should allow BootstrapStandby to work even when the NN is in safe
mode.

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