@Aaron Streaming from all the physical nodes in the cluster should make repair faster, for the same reason it makes bootstrap faster. Shouldn't it ?
2013/8/12 Aaron Morton <aa...@thelastpickle.com> > Aaron - I read about the virtual nodes at > http://www.datastax.com/dev/blog/virtual-nodes-in-cassandra-1-2 > > > Thanks, I did not see anything in there about making repair smoother / > faster. > > Cheers > A > ----------------- > Aaron Morton > Cassandra Consultant > New Zealand > > @aaronmorton > http://www.thelastpickle.com > > On 10/08/2013, at 11:39 AM, rash aroskar <rashmi.aros...@gmail.com> wrote: > > Aaron - I read about the virtual nodes at > http://www.datastax.com/dev/blog/virtual-nodes-in-cassandra-1-2 > > > > > > > > > On Tue, Aug 6, 2013 at 4:49 AM, Richard Low <rich...@wentnet.com> wrote: > >> On 6 August 2013 08:40, Aaron Morton <aa...@thelastpickle.com> wrote: >> >>> The reason for me looking at virtual nodes is because of terrible >>> experiences we had with 0.8 repairs and as per documentation (an logically) >>> the virtual nodes seems like it will help repairs being smoother. Is this >>> true? >>> >>> I've not thought too much about how they help repair run smoother, what >>> was the documentation you read ? >>> >> >> There might be a slight improvement but I haven't observed any. The >> difference might be that, because every node shares replicas with every >> other (with high probability), a single repair operation does the same work >> on the node it was called on, but the rest is spread out over the cluster, >> rather than just the RF nodes either side of the repairing node. This >> means the post-repair compaction work will take less time and the length of >> time a node is loaded for during repair is less. >> >> However, the other benefits of vnodes are likely to be much more useful. >> >> Richard. >> > > >
