[Bugs] [Bug 1540659] New: Introduce lock recovery options to prevent possible post-upgrade mount failures

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1540659

            Bug ID: 1540659
           Summary: Introduce lock recovery options to prevent possible
                    post-upgrade mount failures
           Product: GlusterFS
           Version: mainline
         Component: protocol
          Keywords: Triaged
          Assignee: anoopcs at redhat.com
          Reporter: srangana at redhat.com
                CC: amukherj at redhat.com, bugs at gluster.org



This patch: https://review.gluster.org/12363 removes the following options,
features.lock-heal
features.grace-timeout

Current worry is that if a volume has these options enabled, we would
post-upgrading the server fail for client mounts (or even in other places).
Also, removing these options post-upgrade may fail, as the options are not
available, and hence may need editing the vol files.

We need to test and ensure that the above occurs, and if it does, we need to
fix the situation in consultation with the glusterd team.

Current thoughts for fixing this up is to add these options back but as No-Ops,
such that post upgrade functionality is removed, but the presence of the option
itself does not cause failures.

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