when you do a move, the node is decommissioned and bootstrapped. During the autobootstrap process the node will not receive reads until bootstrapping is complete. I assume during the decommission phase the node will also be unavailable, someone correct me if I'm wrong.
the ring distribution looks better now. The "?" I get all the time too. And if you run "ring" against different hosts, the question marks probably appear in different places. I'm not sure if it means there is a problem. I haven't taken those question marks too seriously. On Apr 12, 2011, at 11:57 AM, Dikang Gu wrote: > After the nodetool move, I got this: > > [root@server3 apache-cassandra-0.7.4]# bin/nodetool -h 10.18.101.213 ring > Address Status State Load Owns Token > > > 113427455640312821154458202477256070485 > 10.18.101.211 ? Normal 82.31 MB 33.33% 0 > > 10.18.101.212 ? Normal 84.24 MB 33.33% > 56713727820156410577229101238628035242 > 10.18.101.213 Up Normal 54.44 MB 33.33% > 113427455640312821154458202477256070485 > > Is this correct? Why is the status "?" ? > > Thanks. > > On Tue, Apr 12, 2011 at 5:43 PM, Dikang Gu <dikan...@gmail.com> wrote: > The 3 nodes were added to the cluster at the same time, so I'm not sure whey > the data vary. > > I calculate the tokens and get: > node 0: 0 > node 1: 56713727820156410577229101238628035242 > node 2: 113427455640312821154458202477256070485 > > So I should set these tokens to the three nodes? > > And during the time I execute the nodetool move commands, can the cassandra > servers serve the front end requests at the same time? Is the data safe? > > Thanks. > > On Tue, Apr 12, 2011 at 5:15 PM, Jonathan Colby <jonathan.co...@gmail.com> > wrote: > This is "normal" when you just add single nodes. When no token is assigned, > the new node takes a portion of the ring from the most heavily loaded node. > As a consequence of this, the nodes will be out of balance. > > In other words, when you double the amount nodes you would not have this > problem. > > The best way to rebalance the cluster is to generate new tokens and use the > nodetool move <new-token> command to rebalance the nodes, one at a time. > > After rebalancing you can run "cleanup" so the nodes get rid of data they no > longer are responsible for. > > links: > > http://wiki.apache.org/cassandra/Operations#Range_changes > > http://wiki.apache.org/cassandra/Operations#Moving_or_Removing_nodes > > http://www.datastax.com/docs/0.7/operations/clustering#adding-capacity > > > > On Apr 12, 2011, at 11:00 AM, Dikang Gu wrote: > > > I have 3 cassandra 0.7.4 nodes in a cluster, and I get the ring stats: > > > > [root@yun-phy2 apache-cassandra-0.7.4]# bin/nodetool -h 192.168.1.28 -p > > 8090 ring > > Address Status State Load Owns Token > > > > 109028275973926493413574716008500203721 > > 192.168.1.25 Up Normal 157.25 MB 69.92% > > 57856537434773737201679995572503935972 > > 192.168.1.27 Up Normal 201.71 MB 24.28% > > 99165710459060760249270263771474737125 > > 192.168.1.28 Up Normal 68.12 MB 5.80% > > 109028275973926493413574716008500203721 > > > > The load and owns vary on each node, is this normal? And is there a way to > > balance the three nodes? > > > > Thanks. > > > > -- > > Dikang Gu > > > > 0086 - 18611140205 > > > > > > > -- > Dikang Gu > > 0086 - 18611140205 > > > > > -- > Dikang Gu > > 0086 - 18611140205 >
