[Bugs] [Bug 1181669] File replicas differ in content even as heal info lists 0 entries in replica 2 setup

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1181669



--- Comment #1 from Anirban Ghoshal <a.ghoshal at tcs.com> ---
The root cause behind this problem seems to one I debugged a short while back.
When we reboot. When we reboot gfs_serv1, so that we can unmount the bricks, we
kill off the glusterfsd processes on it. At this point, as the tcp connection
between the mount client on gfs_serv0 and the glusterfsd on gfs_serv1 breaks,
the former makes portmap queries to the glusterd on gfs_serv1 to get the port
number for glusterfsd.

At this point, if glusterd is not aware that glusterfsd is dead, it is possible
that glusterd will return the port number of the dead glusterfsd process. This
will cause the portmap query to succeed, but no actual connection will be
established between mount client and brick, and then updates to files on
gfs_serv0 will not be immediately propagated to the replica on gfs_serv1. More
details in the mail below:  

http://www.gluster.org/pipermail/gluster-users/2015-February/020770.html  has
all the technical details.

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