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Posted to user@cassandra.apache.org by Jens Rantil <je...@tink.se> on 2014/07/31 11:58:18 UTC

`system` keyspace replication

Hi,

Datastax has a documentation page about configuring replication[1]. It
mentions a couple of system keyspaces that they recommend increasing
replication for. However, it does not mention the `system` keyspace.

Question: Is it recommended to increase replication factor for the `system`
keyspace for production system?

[1]
http://www.datastax.com/docs/datastax_enterprise3.1/deploy/configuring_replication

Thanks,
Jens

Re: `system` keyspace replication

Posted by Jens Rantil <je...@tink.se>.

Great. Thanks for a quick answer, Mark.

Jens


On Thu, Jul 31, 2014 at 12:30 PM, Mark Reddy <ma...@boxever.com> wrote:

> Hi Jens,
>
> The system keyspace is configured with LocalStrategy, this strategy only
> stores data on the the local node. This strategy is reserved for internal
> use only and is used for other things such as SecondaryIndexes.
>
> You cannot change the replication factor of the 'system' keyspace. If you
> attempt to do so, the command will not succeed and will return the
> following message: "Bad Request: Cannot alter system keyspace"
>
>
> Mark
>
>
> On Thu, Jul 31, 2014 at 10:58 AM, Jens Rantil <je...@tink.se> wrote:
>
>> Hi,
>>
>> Datastax has a documentation page about configuring replication[1]. It
>> mentions a couple of system keyspaces that they recommend increasing
>> replication for. However, it does not mention the `system` keyspace.
>>
>> Question: Is it recommended to increase replication factor for the
>> `system` keyspace for production system?
>>
>> [1]
>> http://www.datastax.com/docs/datastax_enterprise3.1/deploy/configuring_replication
>>
>> Thanks,
>> Jens
>>
>
>

Re: `system` keyspace replication

Posted by Mark Reddy <ma...@boxever.com>.

Hi Jens,

The system keyspace is configured with LocalStrategy, this strategy only
stores data on the the local node. This strategy is reserved for internal
use only and is used for other things such as SecondaryIndexes.

You cannot change the replication factor of the 'system' keyspace. If you
attempt to do so, the command will not succeed and will return the
following message: "Bad Request: Cannot alter system keyspace"

Mark

On Thu, Jul 31, 2014 at 10:58 AM, Jens Rantil <je...@tink.se> wrote:

> Hi,
>
> Datastax has a documentation page about configuring replication[1]. It
> mentions a couple of system keyspaces that they recommend increasing
> replication for. However, it does not mention the `system` keyspace.
>
> Question: Is it recommended to increase replication factor for the
> `system` keyspace for production system?
>
> [1]
> http://www.datastax.com/docs/datastax_enterprise3.1/deploy/configuring_replication
>
> Thanks,
> Jens
>