Does your cluster share a same NFS ? On Fri, Mar 12, 2010 at 12:28 AM, Lu welman <[email protected]> wrote:
> Dear Jeff, > > First, thank you very much for your selfless help! > For these three computers, it just seems like they are sharing a same disk > area. I don't know whether they will redundant copy data or other way. > Any way, let me use an example to explain that. > When I create any file, e.g., foo in one of these computers, A. > Then from the other two nodes, B and C, I can see the same file foo. > > Below is the log in my system, > > The success one records like this, you can see that this machine have > format that directory, > > 2010-03-11 17:17:12,689 INFO org.apache.hadoop.hdfs.server.common.Storage: > Storage directory $HOME/data/dir is not formatted. > 2010-03-11 17:17:12,689 INFO org.apache.hadoop.hdfs.server.common.Storage: > Formatting ... > > > The fail node then records like this, he can't use the same directory, > because this directory is locked. > 2010-03-11 17:17:09,176 INFO org.apache.hadoop.hdfs.server.common.Storage: > Cannot lock storage $HOME/data/dir. The directory is already locked. > > > 2010-03-11 17:17:09,288 ERROR > org.apache.hadoop.hdfs.server.datanode.DataNode: java.io.IOException: Cannot > lock storage $HOME/data/dir. The directory is already locked. > > May be these three directories are on independent disks, but from hadoop's > point, it's a same directory, and only can be locked once. > So that why I can't deploy Hadoop. > > Best Regards > welman Lu > -- Best Regards Jeff Zhang
