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From "Todd Lipcon (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-2397) Undeprecate SecondaryNameNode in 0.22, 0.23
Date Mon, 03 Oct 2011 20:52:34 GMT
Undeprecate SecondaryNameNode in 0.22, 0.23
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                 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


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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