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HDFS, mail # dev - Status of CheckpointNode and BackupNode

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Status of CheckpointNode and BackupNode
Eli Collins 2012-10-15, 19:12
Hey gang,

Is anyone using the BackupNode and/or CheckpointNode?   I'm not aware
of anyone using them, and the only outstanding related jira is
HDFS-2064, which has been open for over a year and doesn't seem to be
making progress.  For the past three years the code has only been
maintained as part of other changes and test failures, which has
frankly been a bit of a development tax.  Back in 2008 in HADOOP-4539
the goal for the BackupNode was to eventually become a StandbyNode, it
doesn't look like anyone is working on that.  Users get confused as to
whether to use the 2NN or the CheckpointNode, and what the point of
the BackupNode is since it's not provide HA or evolved. Unless someone
wants to push on their evolution and actively maintain them I don't
think it makes sense to keep them in the tree.  Thoughts?

Todd Lipcon 2012-10-15, 20:26
Aaron T. Myers 2012-10-16, 23:51
Todd Lipcon 2012-10-26, 14:39
Eli Collins 2012-10-26, 15:01