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https://issues.apache.org/jira/browse/HDFS-2731?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13177732#comment-13177732
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Todd Lipcon commented on HDFS-2731:
-----------------------------------
We don't currently support using the 2NN with HA -- we'd need to improve it to
upload the checkpointed images to both NNs. If we think this is critical we
should file another JIRA for it... in HDFS-2291 I actually have added a check
to the 2NN startup that makes it fail to start if HA is enabled.
> 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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