Thank you all.
I have two more question.
1) Is there any implication in running nodetool repair immediately after bringing a new node up (before key migration process is completed) ?
Will it cause some race conditions ? Or will it result in some part of the space never be reclaimed ?
2) How can I figure out the status of key migration in Cassandra?
From: Richard Low <email@example.com>
To: firstname.lastname@example.org; Emalayan Vairavanathan <email@example.com>
Sent: Tuesday, 18 June 2013 12:11 AM
Subject: Re: [Cassandra] Expanding a Cassandra cluster