Re: Why is my cluster imbalanced ?
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" 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 +, 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 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 >>> >>> AddressRackStatus State LoadOwns >>> Token >>> >>> 42535295865117307932921825928971026432 >>> x.x.x.1 1b Up Normal 13.51 GB25.00% >>> 127605887595351923798765477786913079296 >>> x.x.x.2 1b Up Normal 4.46 GB 25.00% >>> 85070591730234615865843651857942052164 >>> x.x.x.3 1a Up Normal 62.58 GB100.00% 0 >>> x.x.x.4 1b Up Normal 66.71 GB50.00% >>> 42535295865117307932921825928971026432 >>> >>> Datacenter: us-west >>> == >>> Replicas: 1 >>> >>> AddressRackStatus State LoadOwns >>> Token >>> >>> x.x.x.5 1b Up Normal 62.72 GB100.00% >>> 100 >>> -- >>> Regards, >>> Oleg Dulin >>> http://www.olegdulin.com >>> >> > > -- > Regards, > Oleg Dulin > http://www.olegdulin.com > > >
Re: Why is my cluster imbalanced ?
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 +, 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 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 AddressRackStatus State LoadOwns Token 42535295865117307932921825928971026432 x.x.x.1 1b Up Normal 13.51 GB25.00% 127605887595351923798765477786913079296 x.x.x.2 1b Up Normal 4.46 GB 25.00% 85070591730234615865843651857942052164 x.x.x.3 1a Up Normal 62.58 GB100.00% 0 x.x.x.4 1b Up Normal 66.71 GB50.00% 42535295865117307932921825928971026432 Datacenter: us-west == Replicas: 1 AddressRackStatus State LoadOwns Token x.x.x.5 1b Up Normal 62.72 GB100.00% 100 -- Regards, Oleg Dulin http://www.olegdulin.com -- Regards, Oleg Dulin http://www.olegdulin.com
Re: Why is my cluster imbalanced ?
Excellent, thanks. On 2014-04-07 12:23:51 +, 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 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 AddressRackStatus State LoadOwns Token 42535295865117307932921825928971026432 x.x.x.1 1b Up Normal 13.51 GB25.00% 127605887595351923798765477786913079296 x.x.x.2 1b Up Normal 4.46 GB 25.00% 85070591730234615865843651857942052164 x.x.x.3 1a Up Normal 62.58 GB100.00% 0 x.x.x.4 1b Up Normal 66.71 GB50.00% 42535295865117307932921825928971026432 Datacenter: us-west == Replicas: 1 AddressRackStatus State LoadOwns Token x.x.x.5 1b Up Normal 62.72 GB100.00% 100 -- Regards, Oleg Dulin http://www.olegdulin.com -- Regards, Oleg Dulin http://www.olegdulin.com
Re: Why is my cluster imbalanced ?
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 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 > > AddressRackStatus State LoadOwns > Token > > 42535295865117307932921825928971026432 > x.x.x.1 1b Up Normal 13.51 GB25.00% > 127605887595351923798765477786913079296 > x.x.x.2 1b Up Normal 4.46 GB 25.00% > 85070591730234615865843651857942052164 > x.x.x.3 1a Up Normal 62.58 GB100.00% 0 > x.x.x.4 1b Up Normal 66.71 GB50.00% > 42535295865117307932921825928971026432 > > Datacenter: us-west > == > Replicas: 1 > > AddressRackStatus State LoadOwns > Token > > x.x.x.5 1b Up Normal 62.72 GB100.00% 100 > -- > Regards, > Oleg Dulin > http://www.olegdulin.com > >
