[Bugs] [Bug 1360402] New: Clients can starve under heavy load

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1360402

            Bug ID: 1360402
           Summary: Clients can starve under heavy load
           Product: GlusterFS
           Version: mainline
         Component: io-threads
          Assignee: bugs at gluster.org
          Reporter: jdarcy at redhat.com
                CC: bugs at gluster.org



A user has reported an instance of $subject.

http://www.gluster.org/pipermail/gluster-users/2016-July/027355.html

We have long known this could be a problem, and the long-term solution is a
proper QoS implementation.  In the interim, we should at least implement one of
the measures described in a followup:

> We might be able to tweak io-threads (which already runs on the
> bricks and already has a global queue) to schedule requests in a
> fairer way across clients.  Right now it executes them in the
> same order that they were read from the network.  That tends to
> be a bit "unfair" and that should be fixed in the network code,
> but that's a much harder task.

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