[Bugs] [Bug 1293536] New: afr: warn if pending xattrs missing during init()

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1293536

            Bug ID: 1293536
           Summary: afr: warn if pending xattrs missing during init()
           Product: GlusterFS
           Version: 3.7.6
         Component: replicate
          Keywords: Triaged
          Assignee: bugs at gluster.org
          Reporter: ravishankar at redhat.com
                CC: bugs at gluster.org, gluster-bugs at redhat.com
        Depends On: 1293293



+++ This bug was initially created as a clone of Bug #1293293 +++

Description of problem:

Since commit 6e635284a4411b816d4d860a28262c9e6dc4bd6a
glusterfs-3.7.7), the afr pending xattrs are stored in the volfile and used
by afr when it initializes. If a cluster is upgraded to 3.7.7 and the volfile
is not regenerated, AFR will crash.


How reproducible:
Always

Steps to Reproduce:
1. Create a 1x2 replica on glusterfs 3.7.6 on one node
2. Upgrade to 3.7.7, restart glusterd
3. gluster volume set all cluster.op-version 30707
4. start the volume and fuse mount it.

Actual results:
Fuse mount will crash

Expected results:
Should not crash

-
--- Additional comment from Vijay Bellur on 2015-12-21 23:31:00 EST ---

COMMIT: http://review.gluster.org/13038 committed in master by Pranith Kumar
Karampuri (pkarampu at redhat.com) 
------
commit 4bfbabfdd698e93a1dc1aad5590ed18f10936c55
Author: Ravishankar N <ravishankar at redhat.com>
Date:   Mon Dec 21 10:09:53 2015 +0000

    afr: warn if pending xattrs missing during init()

    Since commit 6e635284a4411b816d4d860a28262c9e6dc4bd6a
    (glusterfs-3.7.7), the afr pending xattrs are stored in the volfile and
used
    by afr when it initializes. If a cluster is upgraded, prevent afr from
loading
    until the op-version has been bumped up to 3.7.7 and the volfiles have been
    regenerated using a volume set command.

    Without this fix, AFR will crash when initialzing.

    Change-Id: I14249dedb3f2f77cd754d78d8a9a70fdc5fc8c10
    BUG: 1293293
    Signed-off-by: Ravishankar N <ravishankar at redhat.com>
    Reviewed-on: http://review.gluster.org/13038
    Tested-by: Gluster Build System <jenkins at build.gluster.com>
    Tested-by: NetBSD Build System <jenkins at build.gluster.org>
    Reviewed-by: Pranith Kumar Karampuri <pkarampu at redhat.com>


Referenced Bugs:

https://bugzilla.redhat.com/show_bug.cgi?id=1293293
[Bug 1293293] afr: warn if pending xattrs missing during init()
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