Run cleanup
Run the Cleanup option to remove unwanted data after adding a new node to the cluster.
For more information about manually running a cleanup, see the corresponding nodetool cleanup command.
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If OpsCenter role-based security is enabled, be sure that the Cleanup Node Operations permission is enabled for the appropriate user roles.
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In the OpsCenter navigation menu, click your cluster’s name, and then select Nodes.
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In the List view, select one or more nodes, and then click Cleanup.

The Cleanup option is also available from the Actions menu in the Node Details dialog.
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Select a keyspace, and then click Choose.
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If you didn’t select All keyspaces, you must select one or more tables.
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Confirm that you want to run the cleanup operation.
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Click Cleanup.
Messages appear in the header indicating when the cleanup has started and completed. Click the Show Details link to view the progress or outcome on the Activities page.