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From "Aaron T. Myers (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-3438) BootstrapStandby should not require a rollEdits on active node
Date Fri, 18 May 2012 23:57:08 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3438?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13279346#comment-13279346
] 

Aaron T. Myers commented on HDFS-3438:
--------------------------------------

+1, the patch looks great. Thanks a lot, Todd.
                
> 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
>         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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