[PATCH] Send relay heartbeat if wal changes won't be send

[Konstantin Osipov]

* Georgy Kirichenko <georgy at tarantool.org> [18/02/28 20:37]:
> If a replica receives some changes then corresponding wal events are
> generated and relay fiber is waken up before heartbeat timeout.
> But there may be nothing to send if all changes are from the current
> relay peer. In this case an applier doesn't receive anything and break a
> connection.
> 
> Fixes #3160

Pushed.


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