It specifies the maximum gossip shadow round time. It can be used to
reduce the gossip feature check time during node boot up.
For instance, when the first node in the cluster, which listed both
itself and other node as seed in the yaml config, boots up, it will try
to talk to other seed nodes which are not started yet. The gossip shadow
round will be used to fetch the feature info of the cluster. Since there
is no other seed node in the cluster, the shadow round will fail. User
can reduce the default shadow_round_ms option to reduce the boot time.
Fixes#2615
Message-Id: <10916ce9059f3c7f1a1fb465919ae57de3b67d59.1500540297.git.asias@scylladb.com>
(cherry picked from commit cf6f4a5185)
3455bfaa44