Hi everyone, Me again. The problem has been solved, I clean the stuff in /tmp and everything works. Thanks.
Boyu -----Original Message----- From: Boyu Zhang [mailto:bzh...@cs.utsa.edu] Sent: Wednesday, June 24, 2009 3:54 PM To: core-user@hadoop.apache.org Subject: DataNode Cannot Start Incompatible namespaceIDs Hi everyone, I am new to Hadoop. When I run start-all.sh in pseudo distributed model, I got this ERROE: org.apache.hadoop.dfs.DataNode: java.io.IOException: Inconpatible namespaceIDs in /tmp/hadoop-zhang/dfs/data: namenode namespceID=13510389749;datanode namespaceID = 222833940. So I cannot start the datanode. I am sure it is something stupid I did or did not do, I just can't figure it out. I really appreciate it if somebody could help me out. Thanks a lot. Sincerely, Boyu Zhang