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https://issues.apache.org/jira/browse/HDFS-2731?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13185416#comment-13185416
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Sanjay Radia commented on HDFS-2731:
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>if the SBN has empty name dirs it should downloads the image and log from the
>primary (as an optimization it could copy the logs from the shared dir).
I am missing this: both Image and Edits should be on shared dirs (ie no need
to copy image from primary - it should be available in shared dir).
> Autopopulate standby name dirs if they're empty
> -----------------------------------------------
>
> Key: HDFS-2731
> URL: https://issues.apache.org/jira/browse/HDFS-2731
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: ha
> Affects Versions: HA branch (HDFS-1623)
> Reporter: Eli Collins
> Assignee: Eli Collins
>
> To setup a SBN we currently format the primary then manually copy the name
> dirs to the SBN. The SBN should do this automatically. Specifically, on NN
> startup, if HA with a shared edits dir is configured and populated, if the
> SBN has empty name dirs it should downloads the image and log from the
> primary (as an optimization it could copy the logs from the shared dir). If
> the other NN is still in standby then it should fail to start as it does
> currently.
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