Thank you Robert and others for answering my questions. I started to play with nodetool and I have few more questions.
Does nodetool cleanup run synchronously or asynchronously ? If it is running asynchronously is there any way to monitor the progress ? Thank you Emalayan ________________________________ From: Robert Coli <rc...@eventbrite.com> To: user@cassandra.apache.org; Emalayan Vairavanathan <svemala...@yahoo.com> Sent: Thursday, 20 June 2013 10:03 AM Subject: Re: [Cassandra] Running node tool cleanup On Thu, Jun 20, 2013 at 12:01 AM, Emalayan Vairavanathan <svemala...@yahoo.com> wrote: > 1) What will happen if I run nodetool cleanup immediately after bringing a > new node up (i.e. before the key migration process is completed) ? > Will it cause some race conditions ? Or will it result in some part > of the space never be reclaimed ? As I understand it, the new node isn't responsible for the range until the migration process is complete, so I presume cleanup will do nothing in this case. This is so the old node can continue to serve the range during the bootstrap, and in case of bootstrap failure. > 2) After adding a new machine, how can I make sure that the key migration is > completed ? Should I run nodetool netstats on all the nodes ? Is there any > better way ? nodetool ring/netstats and/or grepping the log for the completed-bootstrap message. =Rob
