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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-3438) BootstrapStandby should not require a rollEdits on active node
Date Sat, 19 May 2012 05:20:14 GMT

     [ https://issues.apache.org/jira/browse/HDFS-3438?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Todd Lipcon updated HDFS-3438:
------------------------------

       Resolution: Fixed
    Fix Version/s: 2.0.1
     Hadoop Flags: Reviewed
           Status: Resolved  (was: Patch Available)
    
> 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
>             Fix For: 2.0.1
>
>         Attachments: hdfs-3438.txt
>
>
> 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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