You will have one extra hop. Not big deal, actually. And many client libraries (astyanax for example) are token aware, so they are smart enough to call the right node.
On Mon, Nov 5, 2012 at 9:12 AM, Oleg Dulin <oleg.du...@gmail.com> wrote: > Should be all under 400Gig on each. > > My question is -- is there additional overhead with replicas making requests > to one another for keys they don't have ? how much of an overhead is that ? > > > On 2012-11-05 17:00:37 +0000, Michael Kjellman said: > >> Rule of thumb is to try to keep nodes under 400GB. >> Compactions/Repairs/Move operations etc become a nightmare otherwise. How >> much data do you expect to have on each node? Also depends on caches, >> bloom filters etc >> >> On 11/5/12 8:57 AM, "Oleg Dulin" <oleg.du...@gmail.com> wrote: >> >>> I have 4 nodes at my disposal. >>> >>> I can configure them like this: >>> >>> 1) RF=1, each node has 25% of the data. On random-reads, how big is the >>> performance penalty if a node needs to look for data on another replica >>> ? >>> >>> 2) RF=2, each node has 50% of the data. Same question ? >>> >>> >>> >>> -- >>> Regards, >>> Oleg Dulin >>> NYC Java Big Data Engineer >>> http://www.olegdulin.com/ >>> >>> >> >> >> 'Like' us on Facebook for exclusive content and other resources on all >> Barracuda Networks solutions. >> >> Visit http://barracudanetworks.com/facebook >> >> >> > > > -- > Regards, > Oleg Dulin > NYC Java Big Data Engineer > http://www.olegdulin.com/ > >
