I wasn't able to get decommissioning to work at all and found that just taking the node down got it out of the cluster. What version are you running and how are you initiating the decommissioning?
-Rob Rob Hamilton - VP Network Operations P +1 (410) 379-2195 x 240 E [email protected] 6085 Marshalee Drive, Suite 210 Elkridge, MD 21075 -----Original Message----- From: Hargraves, Alyssa [mailto:[email protected]] Sent: Wednesday, January 21, 2009 7:35 PM To: [email protected] Subject: Decommissioning Nodes Hello Hadoop Users, I was hoping someone would be able to answer a question about node decommissioning. I have a test Hadoop cluster set up which only consists of my computer and a master node. I am looking at the removal and addition of nodes. Adding a node is nearly instant (only about 5 seconds), but removing a node by decommissioning it takes a while, and I don't understand why. Currently, the systems are running no map/reduce tasks and storing no data. DFS Health reports: 7 files and directories, 0 blocks = 7 total. Heap Size is 6.68 MB / 992.31 MB (0%) Capacity : 298.02 GB DFS Remaining : 245.79 GB DFS Used : 4 KB DFS Used% : 0 % Live Nodes : 2 Dead Nodes : 0 Node Last Contact Admin State Size (GB) Used (%) Used (%) Remaining (GB) Blocks master 0 In Service 149.01 0 122.22 0 slave 82 Decommission In Progress 149.01 0 123.58 0 However, even with nothing stored and nothing running, the decommission process takes 3 to 5 minutes, and I'm not quite sure why. There isn't any data to move anywhere, and there aren't any jobs to worry about. I am using 0.18.2. Thank you for any help in solving this, Alyssa Hargraves The information transmitted in this email is intended only for the person(s) or entity to which it is addressed and may contain confidential and/or privileged material. Any review, retransmission, dissemination or other use of, or taking of any action in reliance upon, this information by persons or entities other than the intended recipient is prohibited. If you received this email in error, please contact the sender and permanently delete the email from any computer.
