[Bugs] [Bug 1484722] New: return ENOTCONN for 'non readable' FOPs

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1484722

            Bug ID: 1484722
           Summary: return ENOTCONN for 'non readable' FOPs
           Product: GlusterFS
           Version: mainline
         Component: arbiter
          Keywords: Triaged
          Assignee: ndevos at redhat.com
          Reporter: ndevos at redhat.com
                CC: bugs at gluster.org



Description of problem:
feedback at https://review.gluster.org/#/c/18103/1//COMMIT_MSG@15 :

AFR marks the arbiter brick as 'non readable', so any read-based FOP won't be
sent on it.(See: http://review.gluster.org/13539). So I don't think this change
is really needed. After 13539, even arbiter_readv() won't be hit as well.

It might be a good idea to have this defensive fix (unwind the FOP with
failure) in the rogue case AFR does wind the read fop to arbiter.


Expected results:
No change in behaviour, AFR should not call the FOPs from the arbiter xlator in
any case.

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