I recommend rf=3 for most situations, and it would certainly be appropriate here.
Just remember to add a third rack, and maintain the able number of nodes in each rack. -Tupshin On Apr 7, 2014 9:49 AM, "Oleg Dulin" <oleg.du...@gmail.com> wrote: > Tupshin: > > For EC2, 3 us-east, would you recommend RF=3 ? That would make sense, > wouldn't it... > > That's what I'll do for production. > > Oleg > > On 2014-04-07 12:23:51 +0000, Tupshin Harper said: > > Your us-east datacenter, has RF=2, and 2 racks, which is the right way >> to do it (I would rarely recommend using a different number of racks >> than your RF). But by having three nodes on one rack (1b) and only one >> on the other(1a), you are telling Cassandra to distribute the data so >> that no two copies of the same partition exist on the same rack. >> >> So with rack ownership of 100% and 100% respectively, there is no even >> way to distribute your data among those four nodes. >> >> tl;dr Switch node 2 to rack 1a. >> >> -Tupshin >> >> >> >> On Mon, Apr 7, 2014 at 8:08 AM, Oleg Dulin <oleg.du...@gmail.com> wrote: >> >>> I added two more nodes on Friday, and moved tokens around. >>> >>> For four nodes, the tokesn should be: >>> >>> Node #1: 0 >>> Node #2: 42535295865117307932921825928971026432 >>> Node #3: 85070591730234615865843651857942052864 >>> Node #4: 127605887595351923798765477786913079296 >>> >>> And yet my ring status shows this (for a specific keyspace). RF=2. >>> >>> Datacenter: us-east >>> ========== >>> Replicas: 2 >>> >>> Address Rack Status State Load Owns >>> Token >>> >>> 42535295865117307932921825928971026432 >>> x.x.x.1 1b Up Normal 13.51 GB 25.00% >>> 127605887595351923798765477786913079296 >>> x.x.x.2 1b Up Normal 4.46 GB 25.00% >>> 85070591730234615865843651857942052164 >>> x.x.x.3 1a Up Normal 62.58 GB 100.00% 0 >>> x.x.x.4 1b Up Normal 66.71 GB 50.00% >>> 42535295865117307932921825928971026432 >>> >>> Datacenter: us-west >>> ========== >>> Replicas: 1 >>> >>> Address Rack Status State Load Owns >>> Token >>> >>> x.x.x.5 1b Up Normal 62.72 GB 100.00% >>> 100 >>> -- >>> Regards, >>> Oleg Dulin >>> http://www.olegdulin.com >>> >> > > -- > Regards, > Oleg Dulin > http://www.olegdulin.com > > >
