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https://issues.apache.org/jira/browse/HDFS-3438?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13279346#comment-13279346
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Aaron T. Myers commented on HDFS-3438:
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+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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