Re: nodetool repair on cluster
Thanks Jonathan, Aaron, Daniel! I have a related question. I would like to get a copy of data from these 12-server cluster with manually assigned babanced server tokens, and set it up on a new cluster. I would like to minimize the number of the server on the new cluster without having to build 12 servers on new cluster, copy snapshots from old cluster to new cluster, and start de-commission some servers on new cluster to get it down to the desired number of servers on the new cluster. I am OK with missing data since the last repair ran on the old cluster. Would the following data copy strategy work? Create a new cluster with 4 servers and manually assign balanced server tokens to these four servers; copy most recent snapshot from every 3rd server from the old cluster (of 12 servers) and put them on the new cluster in the same order as they were from old cluster. Run repair on every other node or all nodes on new cluster. Thanks! Huy On Tue, Mar 15, 2011 at 5:16 PM, aaron morton aa...@thelastpickle.comwrote: AFAIK you should run it on every node. http://wiki.apache.org/cassandra/Operations#Repairing_missing_or_inconsistent_data http://wiki.apache.org/cassandra/Operations#Repairing_missing_or_inconsistent_data Aaron On 16 Mar 2011, at 06:58, Daniel Doubleday wrote: At least if you are using RackUnawareStrategy Cheers, Daniel On Mar 15, 2011, at 6:44 PM, Huy Le wrote: Hi, We have a cluster with 12 servers and use RF=3. When running nodetool repair, do we have to run it on all nodes on the cluster or can we run on every 3rd node? Thanks! Huy -- Huy Le Spring Partners, Inc. http://springpadit.com -- Huy Le Spring Partners, Inc. http://springpadit.com
nodetool repair on cluster
Hi, We have a cluster with 12 servers and use RF=3. When running nodetool repair, do we have to run it on all nodes on the cluster or can we run on every 3rd node? Thanks! Huy -- Huy Le Spring Partners, Inc. http://springpadit.com
Re: nodetool repair on cluster
At least if you are using RackUnawareStrategy Cheers, Daniel On Mar 15, 2011, at 6:44 PM, Huy Le wrote: Hi, We have a cluster with 12 servers and use RF=3. When running nodetool repair, do we have to run it on all nodes on the cluster or can we run on every 3rd node? Thanks! Huy -- Huy Le Spring Partners, Inc. http://springpadit.com
Re: nodetool repair on cluster
AFAIK you should run it on every node. http://wiki.apache.org/cassandra/Operations#Repairing_missing_or_inconsistent_data Aaron On 16 Mar 2011, at 06:58, Daniel Doubleday wrote: At least if you are using RackUnawareStrategy Cheers, Daniel On Mar 15, 2011, at 6:44 PM, Huy Le wrote: Hi, We have a cluster with 12 servers and use RF=3. When running nodetool repair, do we have to run it on all nodes on the cluster or can we run on every 3rd node? Thanks! Huy -- Huy Le Spring Partners, Inc. http://springpadit.com
Re: nodetool repair on cluster
right, every 3rd node is adequate w/ RUS/SimpleStrategy since each node repairs all the ranges it has replicated to it. On Tue, Mar 15, 2011 at 12:58 PM, Daniel Doubleday daniel.double...@gmx.net wrote: At least if you are using RackUnawareStrategy Cheers, Daniel On Mar 15, 2011, at 6:44 PM, Huy Le wrote: Hi, We have a cluster with 12 servers and use RF=3. When running nodetool repair, do we have to run it on all nodes on the cluster or can we run on every 3rd node? Thanks! Huy -- Huy Le Spring Partners, Inc. http://springpadit.com -- Jonathan Ellis Project Chair, Apache Cassandra co-founder of DataStax, the source for professional Cassandra support http://www.datastax.com
