James, After issuing a command to decommission a node, you should at least be able to see the following log messages in the namenode logs
Setting the excludes files to some_file_contains_decommissioing_hostname Refreshing hosts (include/exclude) list If you do not see these log messages, maybe you want to check 1) Weather you have set <property> <name>dfs.hosts.exclude</name> <value>some_file_contains_decommissioing_hostname</value> </property> In hdfs-site.xml 2) If you have your this decommissioning hostname file in place. Regards, Tanping From: James Litton [mailto:james.lit...@chacha.com] Sent: Friday, February 11, 2011 1:10 PM To: hdfs-user@hadoop.apache.org Subject: Decommissioning Nodes While decommissioning nodes I am seeing the following in my namenode logs: 2011-02-11 21:05:16,290 WARN org.apache.hadoop.hdfs.server.namenode.FSNamesystem: Not able to place enough replicas, still in need of 5 I haven't seen any progress of decommissioning nodes in several days. I have 12 total nodes with 6 being decommissioned and a replication factor of 3. How long should I expect this to take? Is there a way to force this to move forward? Thank you.
