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  1. Hadoop HDFS
  2. HDFS-2397

Undeprecate SecondaryNameNode

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Details

    • Improvement
    • Status: Closed
    • Major
    • Resolution: Fixed
    • 0.22.0, 0.23.0
    • 0.23.1
    • namenode
    • None
    • Reviewed

    Description

      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).

      Attachments

        1. hdfs-2397.txt
          7 kB
          Eli Collins
        2. hdfs-2397.txt
          7 kB
          Eli Collins
        3. hdfs-2397.txt
          7 kB
          Eli Collins
        4. hdfs-2397.txt
          20 kB
          Eli Collins

        Activity

          People

            eli Eli Collins
            tlipcon Todd Lipcon
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            Dates

              Created:
              Updated:
              Resolved: