[Bugs] [Bug 1292749] New: Friend update floods can render the cluster incapable of handling other commands

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1292749

            Bug ID: 1292749
           Summary: Friend update floods can render the cluster incapable
                    of handling other commands
           Product: GlusterFS
           Version: mainline
         Component: glusterd
          Assignee: kaushal at redhat.com
          Reporter: kaushal at redhat.com
                CC: bugs at gluster.org, gluster-bugs at redhat.com
            Blocks: 1291386



A flood of glusterd friend updates happen whenever a glusterd restarts and
re-establishes all it's connections.

In a large cluster (100s) nodes, this would go on for several minutes. During
this period the cluster isn't able to respond to commands. Simple local
commands, like `gluster volume list` will take relatively very long time to
complete.

When a large number of nodes come back up simultaneously, say due to a network
problem, this flood can last for a long time, longer than expected.

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