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https://issues.apache.org/jira/browse/HDFS-2397?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Arun C Murthy updated HDFS-2397:
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Fix Version/s: 0.23.1
> Undeprecate SecondaryNameNode
> -----------------------------
>
> Key: HDFS-2397
> URL: https://issues.apache.org/jira/browse/HDFS-2397
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: name-node
> Affects Versions: 0.22.0, 0.23.0
> Reporter: Todd Lipcon
> Assignee: Eli Collins
> Fix For: 0.23.1
>
> Attachments: hdfs-2397.txt, hdfs-2397.txt, hdfs-2397.txt,
> hdfs-2397.txt
>
>
> I would like to consider un-deprecating the SecondaryNameNode for 0.23, and
> amending the documentation to indicate that it is still the most trust-worthy
> way to run checkpoints, and while CN/BN may have some advantages, they're not
> battle hardened as of yet. The test coverage for the 2NN is far superior to
> the CheckpointNode or BackupNode, and people have a lot more production
> experience. Indicating that it is deprecated before we have expanded test
> coverage of the CN/BN won't send the right message to our users. (For
> comparison, look at what a mess we got into by prematurely deprecating the
> "old" MR API before the "new" API had feature parity and a few versions of
> bug fixes).
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