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https://issues.apache.org/jira/browse/HDFS-2731?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13177488#comment-13177488
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Todd Lipcon commented on HDFS-2731:
-----------------------------------
The primary shouldn't be removing any old images unless it's taking
checkpoints. But there won't be checkpoints if the standby isn't running yet
(assuming the standby is the one doing checkpointing). So if we get the most
recent image from the NN, then we should always have enough edits in the shared
dir to roll forward from there.
> 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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