Some tests had to be modified to not assume that masters without
replicas will still accept writes. Also, some tests would create tablets
as SPARE without enabling healthcheck. As a result, the tablet has no
way of knowing whether it will eventually be a replica or rdonly, and
hence can't decide whether to enable semi-sync before starting
replication.
Healthcheck is basically required now, and definitely will be once we
fully switch to vtgate discovery mode. So I've removed cases where
tablets were being started SPARE without enabling healthcheck.
We assume the latest backup is the one that's at the end when the list
of directories is sorted. This assumption is violated if we put the
tablet alias first in the name.
New integration test only tests the backup appears to work,
nothing serious yet. Need to refactor a couple more things to
be much easier to test it all with unit tests.
Anthony Yeh
Michael Berlin
Dean Yasuda
Alain Jobart