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From Anthony Grasso <>
Subject Re: Cluster Management
Date Thu, 29 Aug 2013 23:25:37 GMT
Hi Particia,

Thank you for the feedback. It has been helpful.

On Tue, Aug 27, 2013 at 12:02 AM, Patricia Gorla

> Anthony,
> We use a number of tools to manage our Cassandra cluster.
> * Datastax OpsCenter [0] for at a glance information, and trending
> statistics. You can also run operations through here, though I prefer
> to use nodetool for any mutative operation.
> * nodetool for ad hoc status checks, and day-to-day node management.
> * puppet for setup and initialization
> > For example, if I want to make some changes to the configuration file
> that resides on each node, is there a tool that will propagate the change
> to each node?
> For this, we use puppet to manage any changes to the configurations
> (which are stored in git). We initially had Cassandra auto-restart
> when the configuration changed, but you might not want the node to
> automatically join a cluster, so we turned this off.

Puppet was the first thing that came to mind for us as well. In addition,
we had the same thought about auto-restarting nodes when the configuration
is changed. If a configuration on all the nodes is changed, we would want
to restart one node at a time and wait for it to rejoin before restarting
the next one. I am assuming in a case like this, you then manually perform
the restart operation for each node?

> > Another example is if I want to have a rolling repair (nodetool repair
> -pr) and clean up running on my cluster, is there a tool that will help
> manage/configure that?
> Multiple commands to the cluster are sent via clusterssh [1] (cssh for
> OS X). I can easily choose which nodes to control, and run those in
> sync. For any rolling procedures, we send commands one at a time,
> though we've considered sending some of these tasks to cron.

Thanks again for the tip! This is quite interesting; it may help to solve
our immediate problem for now.


> Hope this helps.
> Cheers,
> Patricia
> [0]
> [1]

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