func (s *EtcdServer) updateClusterVersion(ver string) {
if s.cluster.Version() == nil {
plog.Infof("setting up the initial cluster version to %s", version.Cluster(ver))
} else {
plog.Infof("updating the cluster version from %s to %s", version.Cluster(s.cluster.Version().String()), version.Cluster(ver))
}
req := pb.Request{
Method: "PUT",
Path: path.Join(StoreClusterPrefix, "version"),
Val: ver,
}
ctx, cancel := context.WithTimeout(context.Background(), s.cfg.ReqTimeout())
_, err := s.Do(ctx, req)
cancel()
switch err {
case nil:
return
case ErrStopped:
plog.Infof("aborting update cluster version because server is stopped")
return
default:
plog.Errorf("error updating cluster version (%v)", err)
}
}
func MustDetectDowngrade(cv *semver.Version) {
lv := semver.Must(semver.NewVersion(version.Version))
// only keep major.minor version for comparison against cluster version
lv = &semver.Version{Major: lv.Major, Minor: lv.Minor}
if cv != nil && lv.LessThan(*cv) {
plog.Fatalf("cluster cannot be downgraded (current version: %s is lower than determined cluster version: %s).", version.Version, version.Cluster(cv.String()))
}
}
// start prepares and starts server in a new goroutine. It is no longer safe to
// modify a server's fields after it has been sent to Start.
// This function is just used for testing.
func (s *EtcdServer) start() {
if s.snapCount == 0 {
plog.Infof("set snapshot count to default %d", DefaultSnapCount)
s.snapCount = DefaultSnapCount
}
s.w = wait.New()
s.done = make(chan struct{})
s.stop = make(chan struct{})
if s.ClusterVersion() != nil {
plog.Infof("starting server... [version: %v, cluster version: %v]", version.Version, version.Cluster(s.ClusterVersion().String()))
} else {
plog.Infof("starting server... [version: %v, cluster version: to_be_decided]", version.Version)
}
// TODO: if this is an empty log, writes all peer infos
// into the first entry
go s.run()
}