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scheduler_test.go
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scheduler_test.go
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// SPDX-License-Identifier: AGPL-3.0-only
// Provenance-includes-location: https://github.com/cortexproject/cortex/blob/master/pkg/scheduler/scheduler_test.go
// Provenance-includes-license: Apache-2.0
// Provenance-includes-copyright: The Cortex Authors.
package scheduler
import (
"context"
"fmt"
"net"
"net/http"
"strings"
"sync"
"testing"
"time"
"github.com/go-kit/log"
"github.com/grafana/dskit/flagext"
"github.com/grafana/dskit/services"
"github.com/grafana/dskit/test"
"github.com/opentracing/opentracing-go"
"github.com/prometheus/client_golang/prometheus"
promtest "github.com/prometheus/client_golang/prometheus/testutil"
"github.com/stretchr/testify/require"
"github.com/uber/jaeger-client-go/config"
"github.com/weaveworks/common/httpgrpc"
"google.golang.org/grpc"
"google.golang.org/grpc/credentials/insecure"
"github.com/grafana/mimir/pkg/frontend/v2/frontendv2pb"
"github.com/grafana/mimir/pkg/scheduler/schedulerpb"
"github.com/grafana/mimir/pkg/util/httpgrpcutil"
)
const testMaxOutstandingPerTenant = 5
func setupScheduler(t *testing.T, reg prometheus.Registerer) (*Scheduler, schedulerpb.SchedulerForFrontendClient, schedulerpb.SchedulerForQuerierClient) {
cfg := Config{}
flagext.DefaultValues(&cfg)
cfg.MaxOutstandingPerTenant = testMaxOutstandingPerTenant
s, err := NewScheduler(cfg, &limits{queriers: 2}, log.NewNopLogger(), reg)
require.NoError(t, err)
server := grpc.NewServer()
schedulerpb.RegisterSchedulerForFrontendServer(server, s)
schedulerpb.RegisterSchedulerForQuerierServer(server, s)
require.NoError(t, services.StartAndAwaitRunning(context.Background(), s))
t.Cleanup(func() {
_ = services.StopAndAwaitTerminated(context.Background(), s)
})
l, err := net.Listen("tcp", "")
require.NoError(t, err)
go func() {
_ = server.Serve(l)
}()
t.Cleanup(func() {
_ = l.Close()
})
c, err := grpc.Dial(l.Addr().String(), grpc.WithTransportCredentials(insecure.NewCredentials()))
require.NoError(t, err)
t.Cleanup(func() {
_ = c.Close()
})
return s, schedulerpb.NewSchedulerForFrontendClient(c), schedulerpb.NewSchedulerForQuerierClient(c)
}
func TestSchedulerBasicEnqueue(t *testing.T) {
scheduler, frontendClient, querierClient := setupScheduler(t, nil)
frontendLoop := initFrontendLoop(t, frontendClient, "frontend-12345")
frontendToScheduler(t, frontendLoop, &schedulerpb.FrontendToScheduler{
Type: schedulerpb.ENQUEUE,
QueryID: 1,
UserID: "test",
HttpRequest: &httpgrpc.HTTPRequest{Method: "GET", Url: "/hello"},
})
{
querierLoop, err := querierClient.QuerierLoop(context.Background())
require.NoError(t, err)
require.NoError(t, querierLoop.Send(&schedulerpb.QuerierToScheduler{QuerierID: "querier-1"}))
msg2, err := querierLoop.Recv()
require.NoError(t, err)
require.Equal(t, uint64(1), msg2.QueryID)
require.Equal(t, "frontend-12345", msg2.FrontendAddress)
require.Equal(t, "GET", msg2.HttpRequest.Method)
require.Equal(t, "/hello", msg2.HttpRequest.Url)
require.NoError(t, querierLoop.Send(&schedulerpb.QuerierToScheduler{}))
}
verifyNoPendingRequestsLeft(t, scheduler)
}
func TestSchedulerEnqueueWithCancel(t *testing.T) {
scheduler, frontendClient, querierClient := setupScheduler(t, nil)
frontendLoop := initFrontendLoop(t, frontendClient, "frontend-12345")
frontendToScheduler(t, frontendLoop, &schedulerpb.FrontendToScheduler{
Type: schedulerpb.ENQUEUE,
QueryID: 1,
UserID: "test",
HttpRequest: &httpgrpc.HTTPRequest{Method: "GET", Url: "/hello"},
})
frontendToScheduler(t, frontendLoop, &schedulerpb.FrontendToScheduler{
Type: schedulerpb.CANCEL,
QueryID: 1,
})
querierLoop := initQuerierLoop(t, querierClient, "querier-1")
verifyQuerierDoesntReceiveRequest(t, querierLoop, 500*time.Millisecond)
verifyNoPendingRequestsLeft(t, scheduler)
}
func initQuerierLoop(t *testing.T, querierClient schedulerpb.SchedulerForQuerierClient, querier string) schedulerpb.SchedulerForQuerier_QuerierLoopClient {
querierLoop, err := querierClient.QuerierLoop(context.Background())
require.NoError(t, err)
require.NoError(t, querierLoop.Send(&schedulerpb.QuerierToScheduler{QuerierID: querier}))
return querierLoop
}
func TestSchedulerEnqueueByMultipleFrontendsWithCancel(t *testing.T) {
scheduler, frontendClient, querierClient := setupScheduler(t, nil)
frontendLoop1 := initFrontendLoop(t, frontendClient, "frontend-1")
frontendLoop2 := initFrontendLoop(t, frontendClient, "frontend-2")
frontendToScheduler(t, frontendLoop1, &schedulerpb.FrontendToScheduler{
Type: schedulerpb.ENQUEUE,
QueryID: 1,
UserID: "test",
HttpRequest: &httpgrpc.HTTPRequest{Method: "GET", Url: "/hello1"},
})
frontendToScheduler(t, frontendLoop2, &schedulerpb.FrontendToScheduler{
Type: schedulerpb.ENQUEUE,
QueryID: 1,
UserID: "test",
HttpRequest: &httpgrpc.HTTPRequest{Method: "GET", Url: "/hello2"},
})
// Cancel first query by first frontend.
frontendToScheduler(t, frontendLoop1, &schedulerpb.FrontendToScheduler{
Type: schedulerpb.CANCEL,
QueryID: 1,
})
querierLoop := initQuerierLoop(t, querierClient, "querier-1")
// Let's verify that we can receive query 1 from frontend-2.
msg, err := querierLoop.Recv()
require.NoError(t, err)
require.Equal(t, uint64(1), msg.QueryID)
require.Equal(t, "frontend-2", msg.FrontendAddress)
// Must notify scheduler back about finished processing, or it will not send more requests (nor remove "current" request from pending ones).
require.NoError(t, querierLoop.Send(&schedulerpb.QuerierToScheduler{}))
// But nothing else.
verifyQuerierDoesntReceiveRequest(t, querierLoop, 500*time.Millisecond)
verifyNoPendingRequestsLeft(t, scheduler)
}
func TestSchedulerEnqueueWithFrontendDisconnect(t *testing.T) {
scheduler, frontendClient, querierClient := setupScheduler(t, nil)
frontendLoop := initFrontendLoop(t, frontendClient, "frontend-12345")
frontendToScheduler(t, frontendLoop, &schedulerpb.FrontendToScheduler{
Type: schedulerpb.ENQUEUE,
QueryID: 1,
UserID: "test",
HttpRequest: &httpgrpc.HTTPRequest{Method: "GET", Url: "/hello"},
})
// Wait until the frontend has connected to the scheduler.
test.Poll(t, time.Second, float64(1), func() interface{} {
return promtest.ToFloat64(scheduler.connectedFrontendClients)
})
// Disconnect frontend.
require.NoError(t, frontendLoop.CloseSend())
// Wait until the frontend has disconnected.
test.Poll(t, time.Second, float64(0), func() interface{} {
return promtest.ToFloat64(scheduler.connectedFrontendClients)
})
querierLoop := initQuerierLoop(t, querierClient, "querier-1")
verifyQuerierDoesntReceiveRequest(t, querierLoop, 500*time.Millisecond)
verifyNoPendingRequestsLeft(t, scheduler)
}
func TestCancelRequestInProgress(t *testing.T) {
scheduler, frontendClient, querierClient := setupScheduler(t, nil)
frontendLoop := initFrontendLoop(t, frontendClient, "frontend-12345")
frontendToScheduler(t, frontendLoop, &schedulerpb.FrontendToScheduler{
Type: schedulerpb.ENQUEUE,
QueryID: 1,
UserID: "test",
HttpRequest: &httpgrpc.HTTPRequest{Method: "GET", Url: "/hello"},
})
querierLoop, err := querierClient.QuerierLoop(context.Background())
require.NoError(t, err)
require.NoError(t, querierLoop.Send(&schedulerpb.QuerierToScheduler{QuerierID: "querier-1"}))
_, err = querierLoop.Recv()
require.NoError(t, err)
// At this point, scheduler assumes that querier is processing the request (until it receives empty QuerierToScheduler message back).
// Simulate frontend disconnect.
require.NoError(t, frontendLoop.CloseSend())
// Add a little sleep to make sure that scheduler notices frontend disconnect.
time.Sleep(500 * time.Millisecond)
// Report back end of request processing. This should return error, since the QuerierLoop call has finished on scheduler.
// Note: testing on querierLoop.Context() cancellation didn't work :(
err = querierLoop.Send(&schedulerpb.QuerierToScheduler{})
require.Error(t, err)
verifyNoPendingRequestsLeft(t, scheduler)
}
func TestTracingContext(t *testing.T) {
scheduler, frontendClient, _ := setupScheduler(t, nil)
frontendLoop := initFrontendLoop(t, frontendClient, "frontend-12345")
closer, err := config.Configuration{}.InitGlobalTracer("test")
require.NoError(t, err)
defer closer.Close()
req := &schedulerpb.FrontendToScheduler{
Type: schedulerpb.ENQUEUE,
QueryID: 1,
UserID: "test",
HttpRequest: &httpgrpc.HTTPRequest{Method: "GET", Url: "/hello"},
FrontendAddress: "frontend-12345",
}
sp, _ := opentracing.StartSpanFromContext(context.Background(), "client")
opentracing.GlobalTracer().Inject(sp.Context(), opentracing.HTTPHeaders, (*httpgrpcutil.HttpgrpcHeadersCarrier)(req.HttpRequest))
frontendToScheduler(t, frontendLoop, req)
scheduler.pendingRequestsMu.Lock()
defer scheduler.pendingRequestsMu.Unlock()
require.Equal(t, 1, len(scheduler.pendingRequests))
for _, r := range scheduler.pendingRequests {
require.NotNil(t, r.parentSpanContext)
}
}
func TestSchedulerShutdown_FrontendLoop(t *testing.T) {
scheduler, frontendClient, _ := setupScheduler(t, nil)
frontendLoop := initFrontendLoop(t, frontendClient, "frontend-12345")
// Stop the scheduler. This will disable receiving new requests from frontends.
require.NoError(t, services.StopAndAwaitTerminated(context.Background(), scheduler))
// We can still send request to scheduler, but we get shutdown error back.
require.NoError(t, frontendLoop.Send(&schedulerpb.FrontendToScheduler{
Type: schedulerpb.ENQUEUE,
QueryID: 1,
UserID: "test",
HttpRequest: &httpgrpc.HTTPRequest{Method: "GET", Url: "/hello"},
}))
msg, err := frontendLoop.Recv()
require.NoError(t, err)
require.Equal(t, schedulerpb.SHUTTING_DOWN, msg.Status)
}
func TestSchedulerShutdown_QuerierLoop(t *testing.T) {
scheduler, frontendClient, querierClient := setupScheduler(t, nil)
frontendLoop := initFrontendLoop(t, frontendClient, "frontend-12345")
frontendToScheduler(t, frontendLoop, &schedulerpb.FrontendToScheduler{
Type: schedulerpb.ENQUEUE,
QueryID: 1,
UserID: "test",
HttpRequest: &httpgrpc.HTTPRequest{Method: "GET", Url: "/hello"},
})
// Scheduler now has 1 query. Let's connect querier and fetch it.
querierLoop, err := querierClient.QuerierLoop(context.Background())
require.NoError(t, err)
require.NoError(t, querierLoop.Send(&schedulerpb.QuerierToScheduler{QuerierID: "querier-1"}))
// Dequeue first query.
_, err = querierLoop.Recv()
require.NoError(t, err)
require.NoError(t, services.StopAndAwaitTerminated(context.Background(), scheduler))
// Unblock scheduler loop, to find next request.
err = querierLoop.Send(&schedulerpb.QuerierToScheduler{})
require.NoError(t, err)
// This should now return with error, since scheduler is going down.
_, err = querierLoop.Recv()
require.Error(t, err)
}
func TestSchedulerMaxOutstandingRequests(t *testing.T) {
_, frontendClient, _ := setupScheduler(t, nil)
for i := 0; i < testMaxOutstandingPerTenant; i++ {
// coming from different frontends
fl := initFrontendLoop(t, frontendClient, fmt.Sprintf("frontend-%d", i))
require.NoError(t, fl.Send(&schedulerpb.FrontendToScheduler{
Type: schedulerpb.ENQUEUE,
QueryID: uint64(i),
UserID: "test", // for same user.
HttpRequest: &httpgrpc.HTTPRequest{},
}))
msg, err := fl.Recv()
require.NoError(t, err)
require.Equal(t, schedulerpb.OK, msg.Status)
}
// One more query from the same user will trigger an error.
fl := initFrontendLoop(t, frontendClient, "extra-frontend")
require.NoError(t, fl.Send(&schedulerpb.FrontendToScheduler{
Type: schedulerpb.ENQUEUE,
QueryID: 0,
UserID: "test",
HttpRequest: &httpgrpc.HTTPRequest{Method: "GET", Url: "/hello"},
}))
msg, err := fl.Recv()
require.NoError(t, err)
require.Equal(t, schedulerpb.TOO_MANY_REQUESTS_PER_TENANT, msg.Status)
}
func TestSchedulerForwardsErrorToFrontend(t *testing.T) {
_, frontendClient, querierClient := setupScheduler(t, nil)
fm := &frontendMock{resp: map[uint64]*httpgrpc.HTTPResponse{}}
frontendAddress := ""
// Setup frontend grpc server
{
frontendGrpcServer := grpc.NewServer()
frontendv2pb.RegisterFrontendForQuerierServer(frontendGrpcServer, fm)
l, err := net.Listen("tcp", "")
require.NoError(t, err)
frontendAddress = l.Addr().String()
go func() {
_ = frontendGrpcServer.Serve(l)
}()
t.Cleanup(func() {
_ = l.Close()
})
}
// After preparations, start frontend and querier.
frontendLoop := initFrontendLoop(t, frontendClient, frontendAddress)
frontendToScheduler(t, frontendLoop, &schedulerpb.FrontendToScheduler{
Type: schedulerpb.ENQUEUE,
QueryID: 100,
UserID: "test",
HttpRequest: &httpgrpc.HTTPRequest{Method: "GET", Url: "/hello"},
})
// Scheduler now has 1 query. We now connect querier, fetch the request, and then close the connection.
// This will make scheduler to report error back to frontend.
querierLoop, err := querierClient.QuerierLoop(context.Background())
require.NoError(t, err)
require.NoError(t, querierLoop.Send(&schedulerpb.QuerierToScheduler{QuerierID: "querier-1"}))
// Dequeue first query.
_, err = querierLoop.Recv()
require.NoError(t, err)
// Querier now disconnects, without sending empty message back.
require.NoError(t, querierLoop.CloseSend())
// Verify that frontend was notified about request.
test.Poll(t, 2*time.Second, true, func() interface{} {
resp := fm.getRequest(100)
if resp == nil {
return false
}
require.Equal(t, int32(http.StatusInternalServerError), resp.Code)
return true
})
}
func TestSchedulerMetrics(t *testing.T) {
reg := prometheus.NewPedanticRegistry()
scheduler, frontendClient, _ := setupScheduler(t, reg)
frontendLoop := initFrontendLoop(t, frontendClient, "frontend-12345")
frontendToScheduler(t, frontendLoop, &schedulerpb.FrontendToScheduler{
Type: schedulerpb.ENQUEUE,
QueryID: 1,
UserID: "test",
HttpRequest: &httpgrpc.HTTPRequest{Method: "GET", Url: "/hello"},
})
frontendToScheduler(t, frontendLoop, &schedulerpb.FrontendToScheduler{
Type: schedulerpb.ENQUEUE,
QueryID: 1,
UserID: "another",
HttpRequest: &httpgrpc.HTTPRequest{Method: "GET", Url: "/hello"},
})
require.NoError(t, promtest.GatherAndCompare(reg, strings.NewReader(`
# HELP cortex_query_scheduler_queue_length Number of queries in the queue.
# TYPE cortex_query_scheduler_queue_length gauge
cortex_query_scheduler_queue_length{user="another"} 1
cortex_query_scheduler_queue_length{user="test"} 1
`), "cortex_query_scheduler_queue_length"))
scheduler.cleanupMetricsForInactiveUser("test")
require.NoError(t, promtest.GatherAndCompare(reg, strings.NewReader(`
# HELP cortex_query_scheduler_queue_length Number of queries in the queue.
# TYPE cortex_query_scheduler_queue_length gauge
cortex_query_scheduler_queue_length{user="another"} 1
`), "cortex_query_scheduler_queue_length"))
}
func initFrontendLoop(t *testing.T, client schedulerpb.SchedulerForFrontendClient, frontendAddr string) schedulerpb.SchedulerForFrontend_FrontendLoopClient {
loop, err := client.FrontendLoop(context.Background())
require.NoError(t, err)
require.NoError(t, loop.Send(&schedulerpb.FrontendToScheduler{
Type: schedulerpb.INIT,
FrontendAddress: frontendAddr,
}))
// Scheduler acks INIT by sending OK back.
resp, err := loop.Recv()
require.NoError(t, err)
require.Equal(t, schedulerpb.OK, resp.Status)
return loop
}
func frontendToScheduler(t *testing.T, frontendLoop schedulerpb.SchedulerForFrontend_FrontendLoopClient, req *schedulerpb.FrontendToScheduler) {
require.NoError(t, frontendLoop.Send(req))
msg, err := frontendLoop.Recv()
require.NoError(t, err)
require.Equal(t, schedulerpb.OK, msg.Status)
}
// If this verification succeeds, there will be leaked goroutine left behind. It will be cleaned once grpc server is shut down.
func verifyQuerierDoesntReceiveRequest(t *testing.T, querierLoop schedulerpb.SchedulerForQuerier_QuerierLoopClient, timeout time.Duration) {
ch := make(chan interface{}, 1)
go func() {
m, e := querierLoop.Recv()
if e != nil {
ch <- e
} else {
ch <- m
}
}()
select {
case val := <-ch:
require.Failf(t, "expected timeout", "got %v", val)
case <-time.After(timeout):
return
}
}
func verifyNoPendingRequestsLeft(t *testing.T, scheduler *Scheduler) {
test.Poll(t, 1*time.Second, 0, func() interface{} {
scheduler.pendingRequestsMu.Lock()
defer scheduler.pendingRequestsMu.Unlock()
return len(scheduler.pendingRequests)
})
}
type limits struct {
queriers int
}
func (l limits) MaxQueriersPerUser(_ string) int {
return l.queriers
}
type frontendMock struct {
mu sync.Mutex
resp map[uint64]*httpgrpc.HTTPResponse
}
func (f *frontendMock) QueryResult(_ context.Context, request *frontendv2pb.QueryResultRequest) (*frontendv2pb.QueryResultResponse, error) {
f.mu.Lock()
defer f.mu.Unlock()
f.resp[request.QueryID] = request.HttpResponse
return &frontendv2pb.QueryResultResponse{}, nil
}
func (f *frontendMock) getRequest(queryID uint64) *httpgrpc.HTTPResponse {
f.mu.Lock()
defer f.mu.Unlock()
return f.resp[queryID]
}