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From "Aaron T. Myers (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-2397) Undeprecate SecondaryNameNode in 0.22, 0.23
Date Tue, 04 Oct 2011 22:48:34 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2397?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13120549#comment-13120549
] 

Aaron T. Myers commented on HDFS-2397:
--------------------------------------

+1. I see little advantage to using the CN vs. the 2NN, except for the vastly superior name.
                
> Undeprecate SecondaryNameNode in 0.22, 0.23
> -------------------------------------------
>
>                 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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