Not sure if it's up to date, but the FAQ attempts to answer this question: http://wiki.apache.org/hadoop/FAQ#A17.
On Tue, Aug 31, 2010 at 1:04 PM, Allen Wittenauer <awittena...@linkedin.com>wrote: > > On Aug 31, 2010, at 12:58 PM, jiang licht wrote: > > > Is the number of nodes to be decommissioned bounded by replication > factor? > > No, it is bounded mainly by network bandwidth and NN/DN RPC call rate. > I've seen decommissions of like 400 nodes at once. > >
