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From Edward Capriolo <>
Subject Re: [Cassandra] Expanding a Cassandra cluster
Date Mon, 10 Jun 2013 21:53:10 GMT
You eventually should run cleanup to remove data no longer needed on the
node. However it does not need to be run quickly after a join. You can run
it when you get around to it. I would run it on a few nodes at a time until
they are all cleaned up.

On Mon, Jun 10, 2013 at 5:00 PM, Emalayan Vairavanathan <> wrote:

> Hi All,
> Datastax manual suggests that during a Cassandra cluster expansion, an
> administrator has to run nodetool cleanup on each of the previously
> existing Cassandra nodes to remove the keys that are no longer belonging to
> those nodes. Further the manual says that the nodetool cleanup  task
> should be run sequentially on the existing Cassandra nodes.
> Reference:
> Here is my problem: I have a very large Cassandra cluster with 100s of
> nodes and running nodetool cleanup sequentially will take a long time to
> finish.
>  Questions: a) So can someone tell me  about the implications of running
> the nodetool cleanup concurrently on the entire cluster ?
>                    b) Will Cassandra automatically take care of removing
> obsolete keys in future ?
> Thank you
> Emalayan

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