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cluster_downgrade_test.go
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cluster_downgrade_test.go
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// Copyright 2021 The etcd Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package e2e
import (
"context"
"encoding/json"
"fmt"
"strings"
"testing"
"time"
"github.com/coreos/go-semver/semver"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
"go.uber.org/zap"
"go.etcd.io/etcd/api/v3/version"
"go.etcd.io/etcd/client/pkg/v3/fileutil"
clientv3 "go.etcd.io/etcd/client/v3"
"go.etcd.io/etcd/tests/v3/framework/e2e"
"go.etcd.io/etcd/tests/v3/framework/testutils"
)
func TestDowngradeUpgradeClusterOf1(t *testing.T) {
testDowngradeUpgrade(t, 1)
}
func TestDowngradeUpgradeClusterOf3(t *testing.T) {
testDowngradeUpgrade(t, 3)
}
func testDowngradeUpgrade(t *testing.T, clusterSize int) {
currentEtcdBinary := e2e.BinPath.Etcd
lastReleaseBinary := e2e.BinPath.EtcdLastRelease
if !fileutil.Exist(lastReleaseBinary) {
t.Skipf("%q does not exist", lastReleaseBinary)
}
currentVersion, err := e2e.GetVersionFromBinary(currentEtcdBinary)
require.NoError(t, err)
// wipe any pre-release suffix like -alpha.0 we see commonly in builds
currentVersion.PreRelease = ""
lastVersion, err := e2e.GetVersionFromBinary(lastReleaseBinary)
require.NoError(t, err)
require.Equalf(t, lastVersion.Minor, currentVersion.Minor-1, "unexpected minor version difference")
currentVersionStr := currentVersion.String()
lastVersionStr := lastVersion.String()
lastClusterVersion := semver.New(lastVersionStr)
lastClusterVersion.Patch = 0
lastClusterVersionStr := lastClusterVersion.String()
e2e.BeforeTest(t)
t.Logf("Create cluster with version %s", currentVersionStr)
epc := newCluster(t, clusterSize)
for i := 0; i < len(epc.Procs); i++ {
validateVersion(t, epc.Cfg, epc.Procs[i], version.Versions{
Cluster: currentVersionStr,
Server: version.Version,
Storage: currentVersionStr,
})
}
t.Logf("Cluster created")
t.Logf("etcdctl downgrade enable %s", lastVersionStr)
downgradeEnable(t, epc, lastVersion)
t.Log("Downgrade enabled, validating if cluster is ready for downgrade")
for i := 0; i < len(epc.Procs); i++ {
validateVersion(t, epc.Cfg, epc.Procs[i], version.Versions{
Cluster: lastClusterVersionStr,
Server: version.Version,
Storage: lastClusterVersionStr,
})
e2e.AssertProcessLogs(t, epc.Procs[i], "The server is ready to downgrade")
}
t.Log("Cluster is ready for downgrade")
t.Logf("Starting downgrade process to %q", lastVersionStr)
for i := 0; i < len(epc.Procs); i++ {
t.Logf("Downgrading member %d by running %s binary", i, lastReleaseBinary)
stopEtcd(t, epc.Procs[i])
startEtcd(t, epc.Procs[i], lastReleaseBinary)
}
t.Log("All members downgraded, validating downgrade")
e2e.AssertProcessLogs(t, leader(t, epc), "the cluster has been downgraded")
for i := 0; i < len(epc.Procs); i++ {
validateVersion(t, epc.Cfg, epc.Procs[i], version.Versions{
Cluster: lastClusterVersionStr,
Server: lastVersionStr,
})
}
t.Log("Downgrade complete")
t.Logf("Starting upgrade process to %q", currentVersionStr)
for i := 0; i < len(epc.Procs); i++ {
t.Logf("Upgrading member %d", i)
stopEtcd(t, epc.Procs[i])
startEtcd(t, epc.Procs[i], currentEtcdBinary)
// NOTE: The leader has monitor to the cluster version, which will
// update cluster version. We don't need to check the transient
// version just in case that it might be flaky.
}
t.Log("All members upgraded, validating upgrade")
for i := 0; i < len(epc.Procs); i++ {
validateVersion(t, epc.Cfg, epc.Procs[i], version.Versions{
Cluster: currentVersionStr,
Server: version.Version,
Storage: currentVersionStr,
})
}
t.Log("Upgrade complete")
}
func newCluster(t *testing.T, clusterSize int) *e2e.EtcdProcessCluster {
epc, err := e2e.NewEtcdProcessCluster(context.TODO(), t,
e2e.WithClusterSize(clusterSize),
e2e.WithKeepDataDir(true),
)
if err != nil {
t.Fatalf("could not start etcd process cluster (%v)", err)
}
t.Cleanup(func() {
if errC := epc.Close(); errC != nil {
t.Fatalf("error closing etcd processes (%v)", errC)
}
})
return epc
}
func startEtcd(t *testing.T, ep e2e.EtcdProcess, execPath string) {
ep.Config().ExecPath = execPath
err := ep.Restart(context.TODO())
if err != nil {
t.Fatalf("could not start etcd process cluster (%v)", err)
}
}
func downgradeEnable(t *testing.T, epc *e2e.EtcdProcessCluster, ver *semver.Version) {
c, err := e2e.NewEtcdctl(epc.Cfg.Client, epc.EndpointsGRPC())
assert.NoError(t, err)
testutils.ExecuteWithTimeout(t, 20*time.Second, func() {
err := c.DowngradeEnable(context.TODO(), ver.String())
if err != nil {
t.Fatal(err)
}
})
}
func stopEtcd(t *testing.T, ep e2e.EtcdProcess) {
if err := ep.Stop(); err != nil {
t.Fatal(err)
}
}
func validateVersion(t *testing.T, cfg *e2e.EtcdProcessClusterConfig, member e2e.EtcdProcess, expect version.Versions) {
testutils.ExecuteWithTimeout(t, 30*time.Second, func() {
for {
result, err := getMemberVersionByCurl(cfg, member)
if err != nil {
cfg.Logger.Warn("failed to get member version and retrying", zap.Error(err))
time.Sleep(time.Second)
continue
}
if err := compareMemberVersion(expect, result); err != nil {
cfg.Logger.Warn("failed to validate and retrying", zap.Error(err))
time.Sleep(time.Second)
continue
}
break
}
})
}
func leader(t *testing.T, epc *e2e.EtcdProcessCluster) e2e.EtcdProcess {
ctx, cancel := context.WithTimeout(context.Background(), time.Second*10)
defer cancel()
for i := 0; i < len(epc.Procs); i++ {
endpoints := epc.Procs[i].EndpointsGRPC()
cli, err := clientv3.New(clientv3.Config{
Endpoints: endpoints,
DialTimeout: 3 * time.Second,
})
if err != nil {
t.Fatal(err)
}
defer cli.Close()
resp, err := cli.Status(ctx, endpoints[0])
if err != nil {
t.Fatal(err)
}
if resp.Header.GetMemberId() == resp.Leader {
return epc.Procs[i]
}
}
t.Fatal("Leader not found")
return nil
}
func compareMemberVersion(expect version.Versions, target version.Versions) error {
if expect.Server != "" && expect.Server != target.Server {
return fmt.Errorf("expect etcdserver version %v, but got %v", expect.Server, target.Server)
}
if expect.Cluster != "" && expect.Cluster != target.Cluster {
return fmt.Errorf("expect etcdcluster version %v, but got %v", expect.Cluster, target.Cluster)
}
if expect.Storage != "" && expect.Storage != target.Storage {
return fmt.Errorf("expect storage version %v, but got %v", expect.Storage, target.Storage)
}
return nil
}
func getMemberVersionByCurl(cfg *e2e.EtcdProcessClusterConfig, member e2e.EtcdProcess) (version.Versions, error) {
args := e2e.CURLPrefixArgsCluster(cfg, member, "GET", e2e.CURLReq{Endpoint: "/version"})
lines, err := e2e.RunUtilCompletion(args, nil)
if err != nil {
return version.Versions{}, err
}
data := strings.Join(lines, "\n")
result := version.Versions{}
if err := json.Unmarshal([]byte(data), &result); err != nil {
return version.Versions{}, fmt.Errorf("failed to unmarshal (%v): %w", data, err)
}
return result, nil
}