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Allow server to join higher cluster version if NextClusterVersionCompatible is true

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Signed-off-by: Siyuan Zhang <sizhang@google.com>
This commit is contained in:
Siyuan Zhang 2024-03-28 23:29:17 +00:00
parent 51f9d44f86
commit 723ef9f1e4
3 changed files with 6 additions and 3 deletions
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2
etcdmain/help.go
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@ -126,7 +126,7 @@ Clustering:
--enable-v2 '` + strconv.FormatBool(embed.DefaultEnableV2) + `'
Accept etcd V2 client requests.
--next-cluster-version-compatible 'false'
Enable 3.4 to be compatible with next version 3.5, to allow 3.4 server to join 3.5 cluster and start on 3.5 schema.
Enable 3.4 to be compatible with next version 3.5, to allow 3.4 server to join 3.5 cluster and start on 3.5 schema.
Security:
--cert-file ''

5
etcdserver/cluster_util.go
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@ -233,7 +233,7 @@ func decideClusterVersion(lg *zap.Logger, vers map[string]*version.Versions) *se
// cluster version in the range of [MinClusterVersion, Version] and no known members has a cluster version
// out of the range.
// We set this rule since when the local member joins, another member might be offline.
func isCompatibleWithCluster(lg *zap.Logger, cl *membership.RaftCluster, local types.ID, rt http.RoundTripper) bool {
func isCompatibleWithCluster(lg *zap.Logger, cl *membership.RaftCluster, local types.ID, rt http.RoundTripper, nextClusterVersionCompatible bool) bool {
vers := getVersions(lg, cl, local, rt)
minV := semver.Must(semver.NewVersion(version.MinClusterVersion))
maxV := semver.Must(semver.NewVersion(version.Version))
@ -241,6 +241,9 @@ func isCompatibleWithCluster(lg *zap.Logger, cl *membership.RaftCluster, local t
Major: maxV.Major,
Minor: maxV.Minor,
}
if nextClusterVersionCompatible {
maxV.Minor += 1
}
return isCompatibleWithVers(lg, vers, local, minV, maxV)
}

2
etcdserver/server.go
View File

@ -371,7 +371,7 @@ func NewServer(cfg ServerConfig) (srv *EtcdServer, err error) {
if err = membership.ValidateClusterAndAssignIDs(cfg.Logger, cl, existingCluster); err != nil {
return nil, fmt.Errorf("error validating peerURLs %s: %v", existingCluster, err)
}
if !isCompatibleWithCluster(cfg.Logger, cl, cl.MemberByName(cfg.Name).ID, prt) {
if !isCompatibleWithCluster(cfg.Logger, cl, cl.MemberByName(cfg.Name).ID, prt, cfg.NextClusterVersionCompatible) {
return nil, fmt.Errorf("incompatible with current running cluster")
}