riak-admin leave behavior
mark at basho.com
Mon Apr 23 22:48:42 EDT 2012
I'm not sure how much the wiki's explanation contributed to your
understanding of "leave" but it was out of date, so I just updated it
(along with the explanation of "force_remove").
Sorry about that.
On Mon, Apr 23, 2012 at 6:53 PM, Joseph Blomstedt <joe at basho.com> wrote:
> Kyle is correct.
> "riak-admin leave" ensures that all replicas are handed off to other
> nodes before the leaving node exits the cluster. This has been the
> behavior since Riak 1.0 (released last September).
> "riak-admin force-remove" is the command which immediately removes a
> node from the cluster without ensuring handoff of its replicas. This
> is a dangerous command, and is designed to only be used in cases were
> the normal, safe leave behavior cannot be used -- eg. when the node
> you are removing had a major hardware failure and is unrecoverable.
> Using "force-remove" will result in a loss of all replicas living on
> the removed node, which will need to be recovered through other means
> -- such as read repair.
> The standard leave command is an exact opposite of join. Just like a
> join, during a leave, you can inspect the current/pending ring state
> using "riak-admin member_status" as well as see the list of pending
> transfers using "riak-admin ring_status".
> On Mon, Apr 23, 2012 at 6:26 PM, Kyle Kingsbury <aphyr at aphyr.com> wrote:
> > On 04/23/2012 06:23 PM, Michael Radford wrote:
> >> Can someone from Basho clarify?
> >> I understood "handoff" to mean just that it was handing off
> >> *responsibility* for a vnode to another node, and not proactively
> >> creating additional replicas of the data. This information just came
> >> from our technical contact at Basho on 4/18, so I would assume it's up
> >> to date. But I would be happy to learn that riak-admin leave now does
> >> the right thing.
> > Not that I work for basho, but I can absolutely confirm that riak-admin
> > leave (>= 1.1, don't recall 1.0) does involve taking data the local node
> > responsible for and giving it to the remote node. You can watch the file
> > sizes on hosts or network traffic to confirm.
> > --Kyle
> > _______________________________________________
> > riak-users mailing list
> > riak-users at lists.basho.com
> > http://lists.basho.com/mailman/listinfo/riak-users_lists.basho.com
> Joseph Blomstedt <joe at basho.com>
> Software Engineer
> Basho Technologies, Inc.
> riak-users mailing list
> riak-users at lists.basho.com
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