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https://issues.apache.org/jira/browse/HDFS-2736?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13177858#comment-13177858
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Todd Lipcon commented on HDFS-2736:
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Agreed. Currently we also basically support multiple-standby. Even though it
wasn't a goal of the implementation, it basically fell out for free.
> HA: support 2NN with SBN
> ------------------------
>
> Key: HDFS-2736
> URL: https://issues.apache.org/jira/browse/HDFS-2736
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: ha
> Affects Versions: HA branch (HDFS-1623)
> Reporter: Eli Collins
>
> HDFS-2291 adds support for making the SBN capable of checkpointing, seems
> like we may also need to support the 2NN checkpointing as well. Eg if we fail
> over to the SBN does it continue to checkpoint? If not the log grows
> unbounded until the old primary comes back, if so does that create
> performance problems since the primary wasn't previously checkpointing?
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