Thanks, Mark! I have a somewhat-related follow up question: is there a recommended maximum for the amount of data held on a machine?
I ask because at my previous company Cassandra was used, and we were advised to put no more 250 GB per physical box. The reasoning was that in a failure situation, rebuilding any more than this amount of data would cause too great a performance degradation. -- Dave Brady ----- Original Message ----- From: "Mark Phillips" <m...@basho.com> To: "Dave Brady" <dbr...@weborama.com> Cc: riak-users@lists.basho.com Sent: Tuesday, August 14, 2012 7:34:10 PM GMT +01:00 Amsterdam / Berlin / Bern / Rome / Stockholm / Vienna Subject: Re: eLevelDB max_open_files in 1.2.0 Hi Dave, On Sun, Aug 12, 2012 at 3:58 PM, Dave Brady <dbr...@weborama.com> wrote: > Hello, > > First I want to thanks Basho for greatly expanding the documentation on the > Wiki for configuring/tuning Riak and eLevelDB in 1.2.0! Big improvement over > 1.1.x. > > My question is about max_open_files: here the documentation is confusing to > me. > > It says to allocate one open file per 2 MB, then divide by the number of > partitions. This is the same formula used in 1.1.x. > > It goes on to say that if you manually set this parameter in 1.1.x, to divide > that value by two for 1.2.0. > > Should not the formula for 1.2.0, in that case, read as use one file per 4 MB? Long story short, the answer is "yes" :) With 1.2, 4MB is the advised file size, and you should be running with no less that 20 files/nodes. I'll take a pass at updating the docs to make this a bit easier to understand. Thanks for pointing that out. Mark > > Thankks! > > -- > Dave Brady > > > _______________________________________________ > riak-users mailing list > riak-users@lists.basho.com > http://lists.basho.com/mailman/listinfo/riak-users_lists.basho.com _______________________________________________ riak-users mailing list riak-users@lists.basho.com http://lists.basho.com/mailman/listinfo/riak-users_lists.basho.com
