You can simulate disk failure by some fault injection techniques. Applying AspectJ is one of them.
On Wed, May 25, 2011 at 3:07 AM, ccxixicc <ccxix...@foxmail.com> wrote: > > I'm using 0.20.2. > I had some test. I dont know how to simulate a disk failure, just chmod 000 > dir1, the namenode shutdown immediately. And NN will hang if the nfs server > down. > > > > ------------------ Original ------------------ > *From: * "Harsh J"<ha...@cloudera.com>; > *Date: * Wed, May 25, 2011 03:49 PM > *To: * "hdfs-user"<hdfs-user@hadoop.apache.org>; > *Subject: * Re: What if one of the directory(dfs.name.dir) rw error ? > > Yes. But depending on the version you're using, you may have to > manually restart the NN after fixing the mount points, to get the > directories in action again. > > 2011/5/25 ccxixicc <ccxix...@foxmail.com>: > > > > Hi,all > > I set dfs.name.dir to a comma-delimited list of directories, dir1 is in > > /dev/sdb1 dir2 is in /dev/sdb2 and dir3 is nfs derectory. > > What happens if /dev/sdb1 disk error, so dir1 cannot be read and write? > > What happens if nfs server down, so dir3 cannot be read and write? > > Will hadoop ignore the bad directory and use the good directory and > continue > > server? > > Thanks. > > > > > > -- > Harsh J > >
