[Bugs] [Bug 1255582] New: Add the ability to force an unconditional graph reload

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1255582

            Bug ID: 1255582
           Summary: Add the ability to force an unconditional graph reload
           Product: GlusterFS
           Version: mainline
         Component: core
          Assignee: bugs at gluster.org
          Reporter: joe at julianfamily.org
                CC: bugs at gluster.org, gluster-bugs at redhat.com



On the rare occasion something is wrong, like the client will not reconnect to
a brick, I've been able to work around it by changing a volume setting that
affects the client. This causes the client to reload the vol file and return to
sanity.

A kill -HUP does not do this as the client recognizes that the vol file hasn't
changed and refuses to reload.

Adding the ability to force a reload may be beneficial perhaps a SIGUSR2?

I wouldn't rely on the glusterd connection and, in fact, the signal should
force that reconnection as well.

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