[Bugs] [Bug 1450684] New: Geo-replication delay cannot be configured to less than 3 seconds

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1450684

            Bug ID: 1450684
           Summary: Geo-replication delay cannot be configured to less
                    than 3 seconds
           Product: GlusterFS
           Version: 3.10
         Component: geo-replication
          Assignee: bugs at gluster.org
          Reporter: nh2-redhatbugzilla at deditus.de
                CC: bugs at gluster.org



Description of problem (on gluster 3.10.1):

It is impossible to configure geo-replication so that replication has low
latency, even on links that have < 1ms latency.

Questions on how to improve the latency have come up in the past, for example:
http://lists.gluster.org/pipermail/gluster-users/2014-May/017272.html

Setting the volume option `rollover-time 1` improves the situation (it defaults
to 15 seconds delay), but is not fully satisfying, as it can still take up to 3
seconds for a change to be reflected on replication slaves.

This is because gsyncd.py has an option

  op.add_option('--change-interval', metavar='SEC', type=int, default=3)

that defaults to 3 seconds and is not configurable from by the user.

Please make this setting configurable, so that users can set up low-latency geo
replication.

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