/
balancer_test.go
535 lines (480 loc) · 16.8 KB
/
balancer_test.go
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// +build go1.12
/*
*
* Copyright 2020 gRPC 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 clusterimpl
import (
"context"
"strings"
"testing"
"time"
"github.com/google/go-cmp/cmp"
"github.com/google/go-cmp/cmp/cmpopts"
"google.golang.org/grpc/balancer"
"google.golang.org/grpc/balancer/roundrobin"
"google.golang.org/grpc/connectivity"
"google.golang.org/grpc/internal"
internalserviceconfig "google.golang.org/grpc/internal/serviceconfig"
"google.golang.org/grpc/resolver"
"google.golang.org/grpc/xds/internal/testutils"
"google.golang.org/grpc/xds/internal/testutils/fakeclient"
"google.golang.org/grpc/xds/internal/xdsclient"
"google.golang.org/grpc/xds/internal/xdsclient/load"
)
const (
defaultTestTimeout = 1 * time.Second
testClusterName = "test-cluster"
testServiceName = "test-eds-service"
testLRSServerName = "test-lrs-name"
)
var (
testBackendAddrs = []resolver.Address{
{Addr: "1.1.1.1:1"},
}
cmpOpts = cmp.Options{
cmpopts.EquateEmpty(),
cmpopts.IgnoreFields(load.Data{}, "ReportInterval"),
}
)
func subConnFromPicker(p balancer.Picker) func() balancer.SubConn {
return func() balancer.SubConn {
scst, _ := p.Pick(balancer.PickInfo{})
return scst.SubConn
}
}
func init() {
NewRandomWRR = testutils.NewTestWRR
}
// TestDropByCategory verifies that the balancer correctly drops the picks, and
// that the drops are reported.
func TestDropByCategory(t *testing.T) {
defer xdsclient.ClearCounterForTesting(testClusterName)
xdsC := fakeclient.NewClient()
defer xdsC.Close()
builder := balancer.Get(Name)
cc := testutils.NewTestClientConn(t)
b := builder.Build(cc, balancer.BuildOptions{})
defer b.Close()
const (
dropReason = "test-dropping-category"
dropNumerator = 1
dropDenominator = 2
)
if err := b.UpdateClientConnState(balancer.ClientConnState{
ResolverState: xdsclient.SetClient(resolver.State{Addresses: testBackendAddrs}, xdsC),
BalancerConfig: &LBConfig{
Cluster: testClusterName,
EDSServiceName: testServiceName,
LoadReportingServerName: newString(testLRSServerName),
DropCategories: []DropConfig{{
Category: dropReason,
RequestsPerMillion: million * dropNumerator / dropDenominator,
}},
ChildPolicy: &internalserviceconfig.BalancerConfig{
Name: roundrobin.Name,
},
},
}); err != nil {
t.Fatalf("unexpected error from UpdateClientConnState: %v", err)
}
ctx, cancel := context.WithTimeout(context.Background(), defaultTestTimeout)
defer cancel()
got, err := xdsC.WaitForReportLoad(ctx)
if err != nil {
t.Fatalf("xdsClient.ReportLoad failed with error: %v", err)
}
if got.Server != testLRSServerName {
t.Fatalf("xdsClient.ReportLoad called with {%q}: want {%q}", got.Server, testLRSServerName)
}
sc1 := <-cc.NewSubConnCh
b.UpdateSubConnState(sc1, balancer.SubConnState{ConnectivityState: connectivity.Connecting})
// This should get the connecting picker.
p0 := <-cc.NewPickerCh
for i := 0; i < 10; i++ {
_, err := p0.Pick(balancer.PickInfo{})
if err != balancer.ErrNoSubConnAvailable {
t.Fatalf("picker.Pick, got _,%v, want Err=%v", err, balancer.ErrNoSubConnAvailable)
}
}
b.UpdateSubConnState(sc1, balancer.SubConnState{ConnectivityState: connectivity.Ready})
// Test pick with one backend.
p1 := <-cc.NewPickerCh
const rpcCount = 20
for i := 0; i < rpcCount; i++ {
gotSCSt, err := p1.Pick(balancer.PickInfo{})
// Even RPCs are dropped.
if i%2 == 0 {
if err == nil || !strings.Contains(err.Error(), "dropped") {
t.Fatalf("pick.Pick, got %v, %v, want error RPC dropped", gotSCSt, err)
}
continue
}
if err != nil || !cmp.Equal(gotSCSt.SubConn, sc1, cmp.AllowUnexported(testutils.TestSubConn{})) {
t.Fatalf("picker.Pick, got %v, %v, want SubConn=%v", gotSCSt, err, sc1)
}
if gotSCSt.Done != nil {
gotSCSt.Done(balancer.DoneInfo{})
}
}
// Dump load data from the store and compare with expected counts.
loadStore := xdsC.LoadStore()
if loadStore == nil {
t.Fatal("loadStore is nil in xdsClient")
}
const dropCount = rpcCount * dropNumerator / dropDenominator
wantStatsData0 := []*load.Data{{
Cluster: testClusterName,
Service: testServiceName,
TotalDrops: dropCount,
Drops: map[string]uint64{dropReason: dropCount},
}}
gotStatsData0 := loadStore.Stats([]string{testClusterName})
if diff := cmp.Diff(gotStatsData0, wantStatsData0, cmpOpts); diff != "" {
t.Fatalf("got unexpected reports, diff (-got, +want): %v", diff)
}
// Send an update with new drop configs.
const (
dropReason2 = "test-dropping-category-2"
dropNumerator2 = 1
dropDenominator2 = 4
)
if err := b.UpdateClientConnState(balancer.ClientConnState{
ResolverState: xdsclient.SetClient(resolver.State{Addresses: testBackendAddrs}, xdsC),
BalancerConfig: &LBConfig{
Cluster: testClusterName,
EDSServiceName: testServiceName,
LoadReportingServerName: newString(testLRSServerName),
DropCategories: []DropConfig{{
Category: dropReason2,
RequestsPerMillion: million * dropNumerator2 / dropDenominator2,
}},
ChildPolicy: &internalserviceconfig.BalancerConfig{
Name: roundrobin.Name,
},
},
}); err != nil {
t.Fatalf("unexpected error from UpdateClientConnState: %v", err)
}
p2 := <-cc.NewPickerCh
for i := 0; i < rpcCount; i++ {
gotSCSt, err := p2.Pick(balancer.PickInfo{})
// Even RPCs are dropped.
if i%4 == 0 {
if err == nil || !strings.Contains(err.Error(), "dropped") {
t.Fatalf("pick.Pick, got %v, %v, want error RPC dropped", gotSCSt, err)
}
continue
}
if err != nil || !cmp.Equal(gotSCSt.SubConn, sc1, cmp.AllowUnexported(testutils.TestSubConn{})) {
t.Fatalf("picker.Pick, got %v, %v, want SubConn=%v", gotSCSt, err, sc1)
}
if gotSCSt.Done != nil {
gotSCSt.Done(balancer.DoneInfo{})
}
}
const dropCount2 = rpcCount * dropNumerator2 / dropDenominator2
wantStatsData1 := []*load.Data{{
Cluster: testClusterName,
Service: testServiceName,
TotalDrops: dropCount2,
Drops: map[string]uint64{dropReason2: dropCount2},
}}
gotStatsData1 := loadStore.Stats([]string{testClusterName})
if diff := cmp.Diff(gotStatsData1, wantStatsData1, cmpOpts); diff != "" {
t.Fatalf("got unexpected reports, diff (-got, +want): %v", diff)
}
}
// TestDropCircuitBreaking verifies that the balancer correctly drops the picks
// due to circuit breaking, and that the drops are reported.
func TestDropCircuitBreaking(t *testing.T) {
defer xdsclient.ClearCounterForTesting(testClusterName)
xdsC := fakeclient.NewClient()
defer xdsC.Close()
builder := balancer.Get(Name)
cc := testutils.NewTestClientConn(t)
b := builder.Build(cc, balancer.BuildOptions{})
defer b.Close()
var maxRequest uint32 = 50
if err := b.UpdateClientConnState(balancer.ClientConnState{
ResolverState: xdsclient.SetClient(resolver.State{Addresses: testBackendAddrs}, xdsC),
BalancerConfig: &LBConfig{
Cluster: testClusterName,
EDSServiceName: testServiceName,
LoadReportingServerName: newString(testLRSServerName),
MaxConcurrentRequests: &maxRequest,
ChildPolicy: &internalserviceconfig.BalancerConfig{
Name: roundrobin.Name,
},
},
}); err != nil {
t.Fatalf("unexpected error from UpdateClientConnState: %v", err)
}
ctx, cancel := context.WithTimeout(context.Background(), defaultTestTimeout)
defer cancel()
got, err := xdsC.WaitForReportLoad(ctx)
if err != nil {
t.Fatalf("xdsClient.ReportLoad failed with error: %v", err)
}
if got.Server != testLRSServerName {
t.Fatalf("xdsClient.ReportLoad called with {%q}: want {%q}", got.Server, testLRSServerName)
}
sc1 := <-cc.NewSubConnCh
b.UpdateSubConnState(sc1, balancer.SubConnState{ConnectivityState: connectivity.Connecting})
// This should get the connecting picker.
p0 := <-cc.NewPickerCh
for i := 0; i < 10; i++ {
_, err := p0.Pick(balancer.PickInfo{})
if err != balancer.ErrNoSubConnAvailable {
t.Fatalf("picker.Pick, got _,%v, want Err=%v", err, balancer.ErrNoSubConnAvailable)
}
}
b.UpdateSubConnState(sc1, balancer.SubConnState{ConnectivityState: connectivity.Ready})
// Test pick with one backend.
dones := []func(){}
p1 := <-cc.NewPickerCh
const rpcCount = 100
for i := 0; i < rpcCount; i++ {
gotSCSt, err := p1.Pick(balancer.PickInfo{})
if i < 50 && err != nil {
t.Errorf("The first 50%% picks should be non-drops, got error %v", err)
} else if i > 50 && err == nil {
t.Errorf("The second 50%% picks should be drops, got error <nil>")
}
dones = append(dones, func() {
if gotSCSt.Done != nil {
gotSCSt.Done(balancer.DoneInfo{})
}
})
}
for _, done := range dones {
done()
}
dones = []func(){}
// Pick without drops.
for i := 0; i < 50; i++ {
gotSCSt, err := p1.Pick(balancer.PickInfo{})
if err != nil {
t.Errorf("The third 50%% picks should be non-drops, got error %v", err)
}
dones = append(dones, func() {
if gotSCSt.Done != nil {
gotSCSt.Done(balancer.DoneInfo{})
}
})
}
for _, done := range dones {
done()
}
// Dump load data from the store and compare with expected counts.
loadStore := xdsC.LoadStore()
if loadStore == nil {
t.Fatal("loadStore is nil in xdsClient")
}
wantStatsData0 := []*load.Data{{
Cluster: testClusterName,
Service: testServiceName,
TotalDrops: uint64(maxRequest),
}}
gotStatsData0 := loadStore.Stats([]string{testClusterName})
if diff := cmp.Diff(gotStatsData0, wantStatsData0, cmpOpts); diff != "" {
t.Fatalf("got unexpected drop reports, diff (-got, +want): %v", diff)
}
}
// TestPickerUpdateAfterClose covers the case that cluster_impl wants to update
// picker after it's closed. Because picker updates are sent in the run()
// goroutine.
func TestPickerUpdateAfterClose(t *testing.T) {
defer xdsclient.ClearCounterForTesting(testClusterName)
xdsC := fakeclient.NewClient()
defer xdsC.Close()
builder := balancer.Get(Name)
cc := testutils.NewTestClientConn(t)
b := builder.Build(cc, balancer.BuildOptions{})
var maxRequest uint32 = 50
if err := b.UpdateClientConnState(balancer.ClientConnState{
ResolverState: xdsclient.SetClient(resolver.State{Addresses: testBackendAddrs}, xdsC),
BalancerConfig: &LBConfig{
Cluster: testClusterName,
EDSServiceName: testServiceName,
MaxConcurrentRequests: &maxRequest,
ChildPolicy: &internalserviceconfig.BalancerConfig{
Name: roundrobin.Name,
},
},
}); err != nil {
b.Close()
t.Fatalf("unexpected error from UpdateClientConnState: %v", err)
}
// Send SubConn state changes to trigger picker updates. Balancer will
// closed in a defer.
sc1 := <-cc.NewSubConnCh
b.UpdateSubConnState(sc1, balancer.SubConnState{ConnectivityState: connectivity.Connecting})
// This close will race with the SubConn state update.
b.Close()
select {
case <-cc.NewPickerCh:
t.Fatalf("unexpected picker update after balancer is closed")
case <-time.After(time.Millisecond * 10):
}
}
// TestClusterNameInAddressAttributes covers the case that cluster name is
// attached to the subconn address attributes.
func TestClusterNameInAddressAttributes(t *testing.T) {
defer xdsclient.ClearCounterForTesting(testClusterName)
xdsC := fakeclient.NewClient()
defer xdsC.Close()
builder := balancer.Get(Name)
cc := testutils.NewTestClientConn(t)
b := builder.Build(cc, balancer.BuildOptions{})
defer b.Close()
if err := b.UpdateClientConnState(balancer.ClientConnState{
ResolverState: xdsclient.SetClient(resolver.State{Addresses: testBackendAddrs}, xdsC),
BalancerConfig: &LBConfig{
Cluster: testClusterName,
EDSServiceName: testServiceName,
ChildPolicy: &internalserviceconfig.BalancerConfig{
Name: roundrobin.Name,
},
},
}); err != nil {
t.Fatalf("unexpected error from UpdateClientConnState: %v", err)
}
sc1 := <-cc.NewSubConnCh
b.UpdateSubConnState(sc1, balancer.SubConnState{ConnectivityState: connectivity.Connecting})
// This should get the connecting picker.
p0 := <-cc.NewPickerCh
for i := 0; i < 10; i++ {
_, err := p0.Pick(balancer.PickInfo{})
if err != balancer.ErrNoSubConnAvailable {
t.Fatalf("picker.Pick, got _,%v, want Err=%v", err, balancer.ErrNoSubConnAvailable)
}
}
addrs1 := <-cc.NewSubConnAddrsCh
if got, want := addrs1[0].Addr, testBackendAddrs[0].Addr; got != want {
t.Fatalf("sc is created with addr %v, want %v", got, want)
}
cn, ok := internal.GetXDSHandshakeClusterName(addrs1[0].Attributes)
if !ok || cn != testClusterName {
t.Fatalf("sc is created with addr with cluster name %v, %v, want cluster name %v", cn, ok, testClusterName)
}
b.UpdateSubConnState(sc1, balancer.SubConnState{ConnectivityState: connectivity.Ready})
// Test pick with one backend.
p1 := <-cc.NewPickerCh
const rpcCount = 20
for i := 0; i < rpcCount; i++ {
gotSCSt, err := p1.Pick(balancer.PickInfo{})
if err != nil || !cmp.Equal(gotSCSt.SubConn, sc1, cmp.AllowUnexported(testutils.TestSubConn{})) {
t.Fatalf("picker.Pick, got %v, %v, want SubConn=%v", gotSCSt, err, sc1)
}
if gotSCSt.Done != nil {
gotSCSt.Done(balancer.DoneInfo{})
}
}
const testClusterName2 = "test-cluster-2"
var addr2 = resolver.Address{Addr: "2.2.2.2"}
if err := b.UpdateClientConnState(balancer.ClientConnState{
ResolverState: xdsclient.SetClient(resolver.State{Addresses: []resolver.Address{addr2}}, xdsC),
BalancerConfig: &LBConfig{
Cluster: testClusterName2,
EDSServiceName: testServiceName,
ChildPolicy: &internalserviceconfig.BalancerConfig{
Name: roundrobin.Name,
},
},
}); err != nil {
t.Fatalf("unexpected error from UpdateClientConnState: %v", err)
}
addrs2 := <-cc.NewSubConnAddrsCh
if got, want := addrs2[0].Addr, addr2.Addr; got != want {
t.Fatalf("sc is created with addr %v, want %v", got, want)
}
// New addresses should have the new cluster name.
cn2, ok := internal.GetXDSHandshakeClusterName(addrs2[0].Attributes)
if !ok || cn2 != testClusterName2 {
t.Fatalf("sc is created with addr with cluster name %v, %v, want cluster name %v", cn2, ok, testClusterName2)
}
}
// TestReResolution verifies that when a SubConn turns transient failure,
// re-resolution is triggered.
func TestReResolution(t *testing.T) {
defer xdsclient.ClearCounterForTesting(testClusterName)
xdsC := fakeclient.NewClient()
defer xdsC.Close()
builder := balancer.Get(Name)
cc := testutils.NewTestClientConn(t)
b := builder.Build(cc, balancer.BuildOptions{})
defer b.Close()
if err := b.UpdateClientConnState(balancer.ClientConnState{
ResolverState: xdsclient.SetClient(resolver.State{Addresses: testBackendAddrs}, xdsC),
BalancerConfig: &LBConfig{
Cluster: testClusterName,
EDSServiceName: testServiceName,
ChildPolicy: &internalserviceconfig.BalancerConfig{
Name: roundrobin.Name,
},
},
}); err != nil {
t.Fatalf("unexpected error from UpdateClientConnState: %v", err)
}
sc1 := <-cc.NewSubConnCh
b.UpdateSubConnState(sc1, balancer.SubConnState{ConnectivityState: connectivity.Connecting})
// This should get the connecting picker.
p0 := <-cc.NewPickerCh
for i := 0; i < 10; i++ {
_, err := p0.Pick(balancer.PickInfo{})
if err != balancer.ErrNoSubConnAvailable {
t.Fatalf("picker.Pick, got _,%v, want Err=%v", err, balancer.ErrNoSubConnAvailable)
}
}
b.UpdateSubConnState(sc1, balancer.SubConnState{ConnectivityState: connectivity.TransientFailure})
// This should get the transient failure picker.
p1 := <-cc.NewPickerCh
for i := 0; i < 10; i++ {
_, err := p1.Pick(balancer.PickInfo{})
if err == nil {
t.Fatalf("picker.Pick, got _,%v, want not nil", err)
}
}
// The transient failure should trigger a re-resolution.
select {
case <-cc.ResolveNowCh:
case <-time.After(defaultTestTimeout):
t.Fatalf("timeout waiting for ResolveNow()")
}
b.UpdateSubConnState(sc1, balancer.SubConnState{ConnectivityState: connectivity.Ready})
// Test pick with one backend.
p2 := <-cc.NewPickerCh
want := []balancer.SubConn{sc1}
if err := testutils.IsRoundRobin(want, subConnFromPicker(p2)); err != nil {
t.Fatalf("want %v, got %v", want, err)
}
b.UpdateSubConnState(sc1, balancer.SubConnState{ConnectivityState: connectivity.TransientFailure})
// This should get the transient failure picker.
p3 := <-cc.NewPickerCh
for i := 0; i < 10; i++ {
_, err := p3.Pick(balancer.PickInfo{})
if err == nil {
t.Fatalf("picker.Pick, got _,%v, want not nil", err)
}
}
// The transient failure should trigger a re-resolution.
select {
case <-cc.ResolveNowCh:
case <-time.After(defaultTestTimeout):
t.Fatalf("timeout waiting for ResolveNow()")
}
}