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Posted to user@cassandra.apache.org by Huy Le <hu...@springpartners.com> on 2011/03/15 18:44:05 UTC
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
Posted by Huy Le <hu...@springpartners.com>.
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.com>wrote:
> 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
Re: nodetool repair on cluster
Posted by aaron morton <aa...@thelastpickle.com>.
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
Posted by Jonathan Ellis <jb...@gmail.com>.
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
<da...@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
Re: nodetool repair on cluster
Posted by Daniel Doubleday <da...@gmx.net>.
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