We saw the same thing on 3.2.5 on Debian (deb from glusterfs directly). Regards, Alex On Mar 23, 2012, at 8:02 AM, sievers at math2.nat.tu-bs.de wrote: > Dear list, > > I found a case where in a replicated volume, when one brick becomes > unreachable and gets back (either clean reboot or temporarily dropping > all packets with iptables), a file that was written to while the brick > went off forgets its owner and is then owned by root. > At first, this only happens in the brick that was down. Then an ls -l > of the file (not the directory it is in) still shows the correct user, > but triggers a self heal that actually copies ownership in the wrong > direction. Now all further calls to ls -l show root as owner. > > All this does not happen when I just copy a file to the volume, or write > to it from a program just using fwrite(), but happens always with the > following test program which uses fflush(): > > ---------------------------------------- > #include <stdio.h> > #include <unistd.h> > > int main(int argc, char *argv[]){ > int c=0; > FILE *fd; > fd=fopen(argv[1],"w"); > while(1) { > fprintf(fd, "%i\n", ++c); > fflush(fd); > printf("%i\n",c); > sleep(1); > } > } > ---------------------------------------- > > So to reproduce, compile the program, start it: > > $ ./testprogram /replicatedvolume/foo > > reboot or unplug one brick, > stop the program (doesn't matter if brick is already back). > When the brick is back, the file on it will have root as owner. > To see the corruption at the client do: > > $ ls -l /replicatedvolume/foo # 1st time gives correct answer > $ ls -l /replicatedvolume/foo # shows root as owner > > I tried this with debian systems with 64bit servers and a 32bit client, > gluster versions 3.2.4 from squeeze-backports and 3.2.6 directly from > gluster.org, the deb-file for the servers and self compiled from the > tar-file for the client, with underlying filesystems ext4 and xfs. > > I hope this is enough information to reproduce and fix the issue. > (I won't be online till Wednesday.) > > > All the best, > Christian Sievers > _______________________________________________ > Gluster-users mailing list > Gluster-users at gluster.org > http://gluster.org/cgi-bin/mailman/listinfo/gluster-users -- Alex Chekholko chekh at stanford.edu 347-401-4860