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From "Eli Collins (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-2397) Undeprecate SecondaryNameNode in 0.22, 0.23
Date Tue, 24 Jan 2012 00:31:40 GMT

     [ https://issues.apache.org/jira/browse/HDFS-2397?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Eli Collins updated HDFS-2397:
------------------------------

    Attachment: hdfs-2397.txt

Updated patch.  ATM pointed out offline that the cluster setup docs don't have the CN and
BN listed under the recommended users so I've fixed that, also the Backup was listed as using
HADOOP_SECONDARYNAMENODE_OPTS which it doesn't (only secondarynamenode does and that's wired
to SecondaryNameNode), fixe that as well. This one should be good to go.
                
> 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
>            Assignee: Eli Collins
>         Attachments: 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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