Perhaps what you're looking for is the Decommission feature of HDFS, which lets you safely remove a DN without incurring replica loss? It is detailed in Hadoop: The Definitive Guide (2nd Edition), page 315 | Chapter 10: Administering Hadoop / Maintenance section - Title "Decommissioning old nodes", or at http://developer.yahoo.com/hadoop/tutorial/module2.html#decommission?
On Fri, Aug 17, 2012 at 12:41 AM, Terry Healy <[email protected]> wrote: > Sorry - this seems pretty basic, but I could not find a reference on > line or in my books. Is there a graceful way to stop a single datanode, > (for example to move the system to a new rack where it will be put back > on-line) or do you just whack the process ID and let HDFS clean up the > mess? > > Thanks > -- Harsh J
