> Are there tickets/documents explain how data be replicated on Virtual Nodes? This http://www.datastax.com/dev/blog/virtual-nodes-in-cassandra-1-2 Check the changes.txt file, they link to tickets.
not many people use BOP so you may be exploring new'ish territory. Try asking someone on the IRC channel. Cheers ----------------- Aaron Morton Freelance Cassandra Developer New Zealand @aaronmorton http://www.thelastpickle.com On 31/01/2013, at 11:47 PM, Manu Zhang <owenzhang1...@gmail.com> wrote: > On Thu 31 Jan 2013 03:43:32 AM CST, Zhong Li wrote: >> Are there tickets/documents explain how data be replicated on Virtual >> Nodes? If there are multiple tokens on one physical host, may a chance >> two or more tokens chosen by replication strategy located on same >> host? If move/remove/add a token >> manually, does Cassandra Engine validate the case? >> >> Thanks. >> >> >> On Jan 30, 2013, at 12:46 PM, Zhong Li wrote: >> >>>> You add a physical node and that in turn adds num_token tokens to >>>> the ring. >>> >>> No, I am talking about Virtual Nodes with order preserving >>> partitioner. For an existing host with multiple tokens setting list >>> on cassandra.inital_token. After initial bootstrapping, the host will >>> not aware changes of cassandra.inital_token. If I want add a new >>> token( virtual node), I have to rebuild the host with new token list. >>> >>> My question is if there is way to add a virtual nodes without rebuild it? >>> >>> Thanks, >>> >>> On Jan 30, 2013, at 10:21 AM, Manu Zhang wrote: >>> >>>> On Wed 30 Jan 2013 02:29:27 AM CST, Zhong Li wrote: >>>>> One more question, can I add a virtual node manually without reboot >>>>> and rebuild a host data? >>>>> >>>>> I checked nodetool command, there is no option to add a node. >>>>> >>>>> Thanks. >>>>> >>>>> Zhong >>>>> >>>>> >>>>> On Jan 29, 2013, at 11:09 AM, Zhong Li wrote: >>>>> >>>>>> I was misunderstood this >>>>>> http://www.datastax.com/dev/blog/virtual-nodes-in-cassandra-1-2 , >>>>>> especially >>>>>> "If you want to get started with vnodes on a fresh cluster, however, >>>>>> that is fairly straightforward. Just don’t set the >>>>>> |initial_token| parameter in your|conf/cassandra.yaml| and instead >>>>>> enable the |num_tokens| parameter. A good default value for this >>>>>> is 256" >>>>>> >>>>>> Also I couldn't find document about set multiple tokens >>>>>> for cassandra.inital_token >>>>>> >>>>>> Anyway, I just tested, it does work to set comma separated list of >>>>>> tokens. >>>>>> >>>>>> Thanks, >>>>>> >>>>>> Zhong >>>>>> >>>>>> >>>>>> On Jan 29, 2013, at 3:06 AM, aaron morton wrote: >>>>>> >>>>>>>> After I searched some document on Datastax website and some old >>>>>>>> ticket, seems that it works for random partitioner only, and leaves >>>>>>>> order preserved partitioner out of the luck. >>>>>>> Links ? >>>>>>> >>>>>>>> or allow add Virtual Nodes manually? >>>>>>> If not looked into it but there is a cassandra.inital_token startup >>>>>>> param that takes a comma separated list of tokens for the node. >>>>>>> >>>>>>> There also appears to be support for the ordered partitions to >>>>>>> generate random tokens. >>>>>>> >>>>>>> But you would still have the problem of having to balance your row >>>>>>> keys around the token space. >>>>>>> >>>>>>> Cheers >>>>>>> ----------------- >>>>>>> Aaron Morton >>>>>>> Freelance Cassandra Developer >>>>>>> New Zealand >>>>>>> >>>>>>> @aaronmorton >>>>>>> http://www.thelastpickle.com <http://www.thelastpickle.com/> >>>>>>> <http://www.thelastpickle.com/> >>>>>>> >>>>>>> On 29/01/2013, at 10:31 AM, Zhong Li <z...@voxeo.com >>>>>>> <mailto:z...@voxeo.com> >>>>>>> <mailto:z...@voxeo.com>> wrote: >>>>>>> >>>>>>>> Hi All, >>>>>>>> >>>>>>>> Virtual Nodes is great feature. After I searched some document on >>>>>>>> Datastax website and some old ticket, seems that it works for >>>>>>>> random partitioner only, and leaves order preserved partitioner out >>>>>>>> of the luck. I may misunderstand, please correct me. if it doesn't >>>>>>>> love order preserved partitioner, would be possible to add support >>>>>>>> multiple initial_token(s) for order preserved partitioner or >>>>>>>> allow add Virtual Nodes manually? >>>>>>>> >>>>>>>> Thanks, >>>>>>>> >>>>>>>> Zhong >>>>>>> >>>>>> >>>>> >>>> >>>> You add a physical node and that in turn adds num_token tokens to >>>> the ring. >>> >> > > no, those tokens will be skipped
