I wrote a little utility to time splitting and subsequent balancing. I will post some numbers from running this on EC2
https://gist.github.com/keith-turner/5c561e438cb04c501b6e On Fri, Jun 20, 2014 at 2:58 PM, Sean Busbey <[email protected]> wrote: > One thing that jumped out from the most recent D4M paper was this quote: > > One issue that was encountered is that after creating the pre-splits, > they all started out on one server. Accumulo load balanced the splits > across its servers at rate of ~50 splits/second, which is more than > adequate for normal operation, but can take ~20 minutes for 50,000 pre- > splits.[1] > > Do we already have an open ticket that would help this? I think maybe > there's one about being able to presplit a table that is offline? > > I believe our recommended sweet spot is like 100-200 tablets per server > (though I can't find the reference for *why* I believe this ATM), which > means for clusters in the ~100s of nodes this would be in the ballpark for > an expected number of pre-splits. > > > [1]: arXiv:1406.4923v1 [cs.DB] > > -- > Sean >
