On Thu, Jun 30, 2011 at 2:27 PM, Joseph Blomstedt < joseph.blomst...@gmail.com> wrote:
> The code you're looking for is the "should_handoff" fun in > riak_core_vnode.erl: > > https://github.com/basho/riak_core/blob/riak_core-0.14.2/src/riak_core_vnode.erl Thanks, Joe - much appreciated. Joel > There is a timer in the vnodes that fires periodically, and the vnode > will check it's current ring to determine if it is still the owner for > the index it represents. If it's not the current owner, the vnode > initiates handoff to the current owner. This design allows handoff to > occur both due to ring changes (join/leave) as well as for hinted > handoff (eg. when a write destined for a node was sent to a secondary > node during a temporary partition/downtime, and is later handed off to > the real node). > > -Joe > > On Thu, Jun 30, 2011 at 3:04 PM, Joel Meyer <joel.me...@gmail.com> wrote: > > I'm trying to understand when and how data handoff between nodes is > > triggered in riak_core. I was under the impression that data would be > > shuffled when a new node joined the cluster or an existing node left the > > cluster, but maybe that's not the case? It looks like joining a cluster > is > > accomplished by gossiping your ring with a node in the cluster that you > wish > > to join (riak_core_gossip:send_ring(NodeInCluster, node())). Looking > through > > the code I don't see anywhere that a partitions data is transferred once > an > > updated ring is agreed upon. Leaving a cluster seems to be handled > > similarly, but I don't see any handoff triggered in this case either. I > must > > be missing something obvious? I'm looking at tag riak_core-0.14.2. > > Thanks, > > Joel > > _______________________________________________ > > riak-users mailing list > > riak-users@lists.basho.com > > http://lists.basho.com/mailman/listinfo/riak-users_lists.basho.com > > > > >
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