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https://issues.apache.org/jira/browse/HDFS-2731?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13185751#comment-13185751
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Todd Lipcon commented on HDFS-2731:
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bq. 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).
Since we generalized the edit log interface, we can't store images on the
shared edit storage. We only get the stream abstraction for it. We could also
extend the system to require a shared *image* dir, but then we couldn't support
BK-based HA. (In the future when we can store checkpoints in HDFS itself we
wouldn't have that issue)
> 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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