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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