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HDFS >> mail # dev >> Status of CheckpointNode and BackupNode


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Eli Collins 2012-10-15, 19:12
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Todd Lipcon 2012-10-15, 20:26
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Aaron T. Myers 2012-10-16, 23:51
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Re: Status of CheckpointNode and BackupNode
It's been 10 days or so: Eli, do you want to file a JIRA to remove this
code?

Do we need to call a vote of any kind, or is this treated as a code change
where the normal processes apply?

-Todd

On Tue, Oct 16, 2012 at 4:51 PM, Aaron T. Myers <[EMAIL PROTECTED]> wrote:

> I'm also in favor of removing them. I've fielded many questions from users
> about their status, how they compare to other daemons that exist, etc. All
> I've seen them do is increase confusion among users and be a maintenance
> burden on developers.
>
> --
> Aaron T. Myers
> Software Engineer, Cloudera
>
>
>
> On Mon, Oct 15, 2012 at 12:12 PM, Eli Collins <[EMAIL PROTECTED]> wrote:
>
> > 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?
> >
> > Thanks,
> > Eli
> >
>

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Todd Lipcon
Software Engineer, Cloudera
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Eli Collins 2012-10-26, 15:01