Just to add to that. Further test shows that 2i searches aso suffer form the problem of not showing all results durring active vnode transfer. Is this a known issue with Riak 1.2.1? Has it been solved in 1.3?
Anyone else experienced that? I guess attaching a node would trigger that as well, maybe in less severe way. Also I've read somewhere that you should attach one node at a time to Riak cluster, and wait until vnode transfer completes. I think it's no longer true in 1.2 since you have a plan that you commit, but attaching a node and shuffling vnodes will cause problem described What is the solution here? Waiting until vnode transfer finishes is not acceptable (availability) and recent findings show it may take a while on big clusters. Regards Daniel On 11 March 2013 23:06, Daniel Iwan <iwan.dan...@gmail.com> wrote: > I'm aware that listing keys is not for production. > I'm using it mainly during testing, which started to be unreliable after > changes described above. > > What I was not expecting at all was that some of the keys won't be listed. > I'm not sure if that is stated in documentation to tell the truth. > To me it looks like it should be called 'listSomeKeys' > > About alternatives. > Some time ago I did comparison of listing and 2i and MapReduce and > surprisingly listing was quickest. > I'm not sure why it was happening. I did similar tests today and what I > got is: > > 1000 keys, grouped with 2i into 10 equal groups, each value < 1kB > Listing: > - via listkeys 276ms > - via keyindex $key: 255ms > - via 2i (10 calls), total 2480ms > > So for that simple case 2i is 10 times slower. > Further test shows that 100k keys (100 groups, 1000 each) gives query > response between 250-5500ms. > Not good. It's almost silly NOT to use listing keys. > > I may need to do that test on different hardware to compare. At the moment > I'm using just one 7200rpm HDD for Riak db. > > Daniel > >
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