[Bugs] [Bug 1544366] New: Rolling upgrade to 4.0 is broken

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1544366

            Bug ID: 1544366
           Summary: Rolling upgrade to 4.0 is broken
           Product: GlusterFS
           Version: 4.0
         Component: protocol
          Assignee: bugs at gluster.org
          Reporter: ravishankar at redhat.com
                CC: bugs at gluster.org



Description of problem:
Was trying to test https://review.gluster.org/#/c/19538/ when I found that
rolling upgrade from glusterfs-3.13 to the yet to be released glusterfs 4.0 is
broken.  In a  2 node setup, when one node is upgraded, clients mounted on each
node can only see the local bricks and not the ones on the other node. I see
the following errors in the client logs.:

E [MSGID: 114044] [client-handshake.c:1093:client_setvolume_cbk]
0-testvol-client-1: SETVOLUME on remote-host failed: lock state version not
supplied [Invalid argument]


Steps to Reproduce:
1. Create a 2 node 1x2 volume and mount locally on each node, all on
glustefs-3.13.
2. Upgrade one of the nodes to 4.0 branch
3. Clients can see only local bricks.

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