[Bugs] [Bug 1145681] New: Rebalancing Issue in distributed volume

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1145681

            Bug ID: 1145681
           Summary: Rebalancing Issue in distributed volume
           Product: GlusterFS
           Version: 3.5.1
         Component: distribute
          Severity: medium
          Assignee: gluster-bugs at redhat.com
          Reporter: thierry.lamoureux at noveltis.fr
                CC: bugs at gluster.org



Description of problem:
I am in a 3 hosts/3 bricks cluster configuration (Debian), with a single
distributed volume.

Because I would like to change the FS of my bricks from xfs to ext4 (xfs is to
slow with small files) I performed the following commands :
- remove a brick
- commit the removal
- add the new brick to the pool
- launch rebalancing

The rebalancing finished successfully with some skipped files :
http://pastebin.com/wekv3CRv

The problem is that every skipped files are present at two several location :
- on its source brick : the file is consistent
- on its destination brick : the file is corrupted

Here is an example :
# ls -lrt /glusterfs/projets-brick1/some_folder/file.dat 
-rw-rw----+ 2 some_user some_group 32302 Sep  5 10:34
/glusterfs/projets-brick1/some_folder/file.dat 

# ls -lrt /glusterfs/projets-brick2/some_folder/file.dat 
-rw-rw---T+ 2 some_user some_group 32302 Sep 19 10:01
/glusterfs/projets-brick2/some_folder/file.dat

The difference between the two files is the modification date. One has the good
date (in this case brick1) unlike the other file  (and corrupted) has the
rebalancing date (in this case brick2).

On the client (direct glusterfs mount or glusterfs over CIFS) each time we
refresh the file, the modification date changed. I concluded that one time it
was pointing to a brick and the second time to the other brick.

I need to perform these steps twice again, in order to change all my brick's FS
type. I would like to be more serene before to continue.

Thx.
T-

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