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followerreads_test.go
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followerreads_test.go
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// Copyright 2019 The Cockroach Authors.
//
// Licensed as a CockroachDB Enterprise file under the Cockroach Community
// License (the "License"); you may not use this file except in compliance with
// the License. You may obtain a copy of the License at
//
// https://github.com/cockroachdb/cockroach/blob/master/licenses/CCL.txt
package kvfollowerreadsccl
import (
"context"
gosql "database/sql"
"fmt"
"math"
"net/url"
"testing"
"time"
"github.com/cockroachdb/cockroach/pkg/base"
// Blank import kvtenantccl so that we can create a tenant.
_ "github.com/cockroachdb/cockroach/pkg/ccl/kvccl/kvtenantccl"
"github.com/cockroachdb/cockroach/pkg/ccl/utilccl"
"github.com/cockroachdb/cockroach/pkg/keys"
"github.com/cockroachdb/cockroach/pkg/kv"
"github.com/cockroachdb/cockroach/pkg/kv/kvclient/kvcoord"
"github.com/cockroachdb/cockroach/pkg/kv/kvserver"
"github.com/cockroachdb/cockroach/pkg/kv/kvserver/closedts"
"github.com/cockroachdb/cockroach/pkg/kv/kvserver/concurrency/lock"
"github.com/cockroachdb/cockroach/pkg/roachpb"
"github.com/cockroachdb/cockroach/pkg/rpc"
"github.com/cockroachdb/cockroach/pkg/security/username"
"github.com/cockroachdb/cockroach/pkg/settings/cluster"
"github.com/cockroachdb/cockroach/pkg/sql"
"github.com/cockroachdb/cockroach/pkg/sql/physicalplan/replicaoracle"
"github.com/cockroachdb/cockroach/pkg/testutils"
"github.com/cockroachdb/cockroach/pkg/testutils/serverutils"
"github.com/cockroachdb/cockroach/pkg/testutils/skip"
"github.com/cockroachdb/cockroach/pkg/testutils/sqlutils"
"github.com/cockroachdb/cockroach/pkg/testutils/testcluster"
"github.com/cockroachdb/cockroach/pkg/util"
"github.com/cockroachdb/cockroach/pkg/util/hlc"
"github.com/cockroachdb/cockroach/pkg/util/leaktest"
"github.com/cockroachdb/cockroach/pkg/util/log"
"github.com/cockroachdb/cockroach/pkg/util/stop"
"github.com/cockroachdb/cockroach/pkg/util/syncutil"
"github.com/cockroachdb/cockroach/pkg/util/tracing/tracingpb"
"github.com/cockroachdb/cockroach/pkg/util/uuid"
"github.com/cockroachdb/errors"
"github.com/stretchr/testify/require"
)
const (
expectedFollowerReadOffset time.Duration = -4200 * time.Millisecond
)
func TestEvalFollowerReadOffset(t *testing.T) {
defer leaktest.AfterTest(t)()
disableEnterprise := utilccl.TestingEnableEnterprise()
defer disableEnterprise()
st := cluster.MakeTestingClusterSettings()
if offset, err := evalFollowerReadOffset(uuid.MakeV4(), st); err != nil {
t.Fatal(err)
} else if offset != expectedFollowerReadOffset {
t.Fatalf("expected %v, got %v", expectedFollowerReadOffset, offset)
}
disableEnterprise()
_, err := evalFollowerReadOffset(uuid.MakeV4(), st)
if !testutils.IsError(err, "requires an enterprise license") {
t.Fatalf("failed to get error when evaluating follower read offset without " +
"an enterprise license")
}
}
func TestZeroDurationDisablesFollowerReadOffset(t *testing.T) {
defer leaktest.AfterTest(t)()
defer utilccl.TestingEnableEnterprise()()
ctx := context.Background()
st := cluster.MakeTestingClusterSettings()
closedts.TargetDuration.Override(ctx, &st.SV, 0)
if offset, err := evalFollowerReadOffset(uuid.MakeV4(), st); err != nil {
t.Fatal(err)
} else if offset != math.MinInt64 {
t.Fatalf("expected %v, got %v", math.MinInt64, offset)
}
}
func TestCanSendToFollower(t *testing.T) {
defer leaktest.AfterTest(t)()
skip.UnderDeadlock(t, "test is flaky under deadlock+stress")
ctx := context.Background()
clock := hlc.NewClockWithSystemTimeSource(base.DefaultMaxClockOffset /* maxOffset */)
stale := clock.Now().Add(2*expectedFollowerReadOffset.Nanoseconds(), 0)
current := clock.Now()
future := clock.Now().Add(2*clock.MaxOffset().Nanoseconds(), 0)
txn := func(ts hlc.Timestamp) *roachpb.Transaction {
txn := roachpb.MakeTransaction("txn", nil, 0, ts, 0, 1)
return &txn
}
withWriteTimestamp := func(txn *roachpb.Transaction, ts hlc.Timestamp) *roachpb.Transaction {
txn.WriteTimestamp = ts
return txn
}
withUncertaintyLimit := func(txn *roachpb.Transaction, ts hlc.Timestamp) *roachpb.Transaction {
txn.GlobalUncertaintyLimit = ts
return txn
}
batch := func(txn *roachpb.Transaction, req roachpb.Request) roachpb.BatchRequest {
var ba roachpb.BatchRequest
ba.Txn = txn
ba.Add(req)
return ba
}
withBatchTimestamp := func(ba roachpb.BatchRequest, ts hlc.Timestamp) roachpb.BatchRequest {
ba.Timestamp = ts
return ba
}
withServerSideBatchTimestamp := func(ba roachpb.BatchRequest, ts hlc.Timestamp) roachpb.BatchRequest {
ba = withBatchTimestamp(ba, ts)
ba.TimestampFromServerClock = (*hlc.ClockTimestamp)(&ts)
return ba
}
testCases := []struct {
name string
ba roachpb.BatchRequest
ctPolicy roachpb.RangeClosedTimestampPolicy
disabledEnterprise bool
disabledFollowerReads bool
zeroTargetDuration bool
exp bool
}{
{
name: "non-txn batch, without ts",
ba: batch(nil, &roachpb.GetRequest{}),
exp: false,
},
{
name: "stale non-txn batch",
ba: withBatchTimestamp(batch(nil, &roachpb.GetRequest{}), stale),
exp: true,
},
{
name: "current-time non-txn batch",
ba: withBatchTimestamp(batch(nil, &roachpb.GetRequest{}), current),
exp: false,
},
{
name: "future non-txn batch",
ba: withBatchTimestamp(batch(nil, &roachpb.GetRequest{}), future),
exp: false,
},
{
name: "stale non-txn batch, server-side ts",
ba: withServerSideBatchTimestamp(batch(nil, &roachpb.GetRequest{}), stale),
exp: false,
},
{
name: "current-time non-txn batch, server-side ts",
ba: withServerSideBatchTimestamp(batch(nil, &roachpb.GetRequest{}), current),
exp: false,
},
{
name: "future non-txn batch, server-side ts",
ba: withServerSideBatchTimestamp(batch(nil, &roachpb.GetRequest{}), future),
exp: false,
},
{
name: "stale read",
ba: batch(txn(stale), &roachpb.GetRequest{}),
exp: true,
},
{
name: "stale locking read",
ba: batch(txn(stale), &roachpb.ScanRequest{KeyLocking: lock.Exclusive}),
exp: false,
},
{
name: "stale write",
ba: batch(txn(stale), &roachpb.PutRequest{}),
exp: false,
},
{
name: "stale heartbeat txn",
ba: batch(txn(stale), &roachpb.HeartbeatTxnRequest{}),
exp: false,
},
{
name: "stale end txn",
ba: batch(txn(stale), &roachpb.EndTxnRequest{}),
exp: false,
},
{
name: "stale non-txn request",
ba: batch(txn(stale), &roachpb.QueryTxnRequest{}),
exp: false,
},
{
name: "stale read with current-time writes",
ba: batch(withWriteTimestamp(txn(stale), current), &roachpb.GetRequest{}),
exp: false,
},
{
name: "stale read with current-time uncertainty limit",
ba: batch(withUncertaintyLimit(txn(stale), current), &roachpb.GetRequest{}),
exp: false,
},
{
name: "stale read when zero target_duration",
ba: batch(txn(stale), &roachpb.GetRequest{}),
zeroTargetDuration: true,
exp: false,
},
{
name: "current-time read",
ba: batch(txn(current), &roachpb.GetRequest{}),
exp: false,
},
{
name: "future read",
ba: batch(txn(future), &roachpb.GetRequest{}),
exp: false,
},
{
name: "non-txn batch, without ts, global reads policy",
ba: batch(nil, &roachpb.GetRequest{}),
ctPolicy: roachpb.LEAD_FOR_GLOBAL_READS,
exp: false,
},
{
name: "stale non-txn batch, global reads policy",
ba: withBatchTimestamp(batch(nil, &roachpb.GetRequest{}), stale),
ctPolicy: roachpb.LEAD_FOR_GLOBAL_READS,
exp: true,
},
{
name: "current-time non-txn batch, global reads policy",
ba: withBatchTimestamp(batch(nil, &roachpb.GetRequest{}), current),
ctPolicy: roachpb.LEAD_FOR_GLOBAL_READS,
exp: true,
},
{
name: "future non-txn batch, global reads policy",
ba: withBatchTimestamp(batch(nil, &roachpb.GetRequest{}), future),
ctPolicy: roachpb.LEAD_FOR_GLOBAL_READS,
exp: false,
},
{
name: "stale non-txn batch, server-side ts, global reads policy",
ba: withServerSideBatchTimestamp(batch(nil, &roachpb.GetRequest{}), stale),
ctPolicy: roachpb.LEAD_FOR_GLOBAL_READS,
exp: false,
},
{
name: "current-time non-txn batch, server-side ts, global reads policy",
ba: withServerSideBatchTimestamp(batch(nil, &roachpb.GetRequest{}), current),
ctPolicy: roachpb.LEAD_FOR_GLOBAL_READS,
exp: false,
},
{
name: "future non-txn batch, server-side ts, global reads policy",
ba: withServerSideBatchTimestamp(batch(nil, &roachpb.GetRequest{}), future),
ctPolicy: roachpb.LEAD_FOR_GLOBAL_READS,
exp: false,
},
{
name: "stale read, global reads policy",
ba: batch(txn(stale), &roachpb.GetRequest{}),
ctPolicy: roachpb.LEAD_FOR_GLOBAL_READS,
exp: true,
},
{
name: "stale locking read, global reads policy",
ba: batch(txn(stale), &roachpb.ScanRequest{KeyLocking: lock.Exclusive}),
ctPolicy: roachpb.LEAD_FOR_GLOBAL_READS,
exp: false,
},
{
name: "stale write, global reads policy",
ba: batch(txn(stale), &roachpb.PutRequest{}),
ctPolicy: roachpb.LEAD_FOR_GLOBAL_READS,
exp: false,
},
{
name: "stale heartbeat txn, global reads policy",
ba: batch(txn(stale), &roachpb.HeartbeatTxnRequest{}),
ctPolicy: roachpb.LEAD_FOR_GLOBAL_READS,
exp: false,
},
{
name: "stale end txn, global reads policy",
ba: batch(txn(stale), &roachpb.EndTxnRequest{}),
ctPolicy: roachpb.LEAD_FOR_GLOBAL_READS,
exp: false,
},
{
name: "stale non-txn request, global reads policy",
ba: batch(txn(stale), &roachpb.QueryTxnRequest{}),
ctPolicy: roachpb.LEAD_FOR_GLOBAL_READS,
exp: false,
},
{
name: "stale read with current-time writes, global reads policy",
ba: batch(withWriteTimestamp(txn(stale), current), &roachpb.GetRequest{}),
ctPolicy: roachpb.LEAD_FOR_GLOBAL_READS,
exp: true,
},
{
name: "stale read with current-time uncertainty limit, global reads policy",
ba: batch(withUncertaintyLimit(txn(stale), current), &roachpb.GetRequest{}),
ctPolicy: roachpb.LEAD_FOR_GLOBAL_READS,
exp: true,
},
{
name: "current-time read, global reads policy",
ba: batch(txn(current), &roachpb.GetRequest{}),
ctPolicy: roachpb.LEAD_FOR_GLOBAL_READS,
exp: true,
},
{
name: "current-time read with future writes, global reads policy",
ba: batch(withWriteTimestamp(txn(current), future), &roachpb.GetRequest{}),
ctPolicy: roachpb.LEAD_FOR_GLOBAL_READS,
exp: false,
},
{
name: "current-time read with future uncertainty limit, global reads policy",
ba: batch(withUncertaintyLimit(txn(current), future), &roachpb.GetRequest{}),
ctPolicy: roachpb.LEAD_FOR_GLOBAL_READS,
exp: false,
},
{
name: "future read, global reads policy",
ba: batch(txn(future), &roachpb.GetRequest{}),
ctPolicy: roachpb.LEAD_FOR_GLOBAL_READS,
exp: false,
},
{
name: "non-enterprise",
disabledEnterprise: true,
exp: false,
},
{
name: "follower reads disabled",
disabledFollowerReads: true,
exp: false,
},
}
for _, c := range testCases {
t.Run(c.name, func(t *testing.T) {
if !c.disabledEnterprise {
defer utilccl.TestingEnableEnterprise()()
}
st := cluster.MakeTestingClusterSettings()
kvserver.FollowerReadsEnabled.Override(ctx, &st.SV, !c.disabledFollowerReads)
if c.zeroTargetDuration {
closedts.TargetDuration.Override(ctx, &st.SV, 0)
}
can := canSendToFollower(uuid.MakeV4(), st, clock, c.ctPolicy, c.ba)
require.Equal(t, c.exp, can)
})
}
}
// mockNodeStore implements the kvcoord.NodeDescStore interface.
type mockNodeStore []roachpb.NodeDescriptor
func (s mockNodeStore) GetNodeDescriptor(id roachpb.NodeID) (*roachpb.NodeDescriptor, error) {
for i := range s {
desc := &s[i]
if desc.NodeID == id {
return desc, nil
}
}
return nil, errors.Errorf("unable to look up descriptor for n%d", id)
}
// TestOracle tests the Oracle exposed by this package.
func TestOracle(t *testing.T) {
defer leaktest.AfterTest(t)()
ctx := context.Background()
stopper := stop.NewStopper()
defer stopper.Stop(ctx)
clock := hlc.NewClockWithSystemTimeSource(base.DefaultMaxClockOffset /* maxOffset */)
stale := clock.Now().Add(2*expectedFollowerReadOffset.Nanoseconds(), 0)
current := clock.Now()
future := clock.Now().Add(2*clock.MaxOffset().Nanoseconds(), 0)
c := kv.NewDB(log.MakeTestingAmbientCtxWithNewTracer(), kv.MockTxnSenderFactory{}, clock, stopper)
staleTxn := kv.NewTxn(ctx, c, 0)
require.NoError(t, staleTxn.SetFixedTimestamp(ctx, stale))
currentTxn := kv.NewTxn(ctx, c, 0)
require.NoError(t, currentTxn.SetFixedTimestamp(ctx, current))
futureTxn := kv.NewTxn(ctx, c, 0)
require.NoError(t, futureTxn.SetFixedTimestamp(ctx, future))
nodes := mockNodeStore{
{NodeID: 1, Address: util.MakeUnresolvedAddr("tcp", "1")},
{NodeID: 2, Address: util.MakeUnresolvedAddr("tcp", "2")},
{NodeID: 3, Address: util.MakeUnresolvedAddr("tcp", "3")},
}
replicas := []roachpb.ReplicaDescriptor{
{NodeID: 1, StoreID: 1},
{NodeID: 2, StoreID: 2},
{NodeID: 3, StoreID: 3},
}
desc := &roachpb.RangeDescriptor{
InternalReplicas: replicas,
}
closestFollower := replicas[1]
leaseholder := replicas[2]
rpcContext := rpc.NewInsecureTestingContext(ctx, clock, stopper)
setLatency := func(addr string, latency time.Duration) {
// All test cases have to have at least 11 measurement values in order for
// the exponentially-weighted moving average to work properly. See the
// comment on the WARMUP_SAMPLES const in the ewma package for details.
for i := 0; i < 11; i++ {
rpcContext.RemoteClocks.UpdateOffset(ctx, addr, rpc.RemoteOffset{}, latency)
}
}
setLatency("1", 100*time.Millisecond)
setLatency("2", 2*time.Millisecond)
setLatency("3", 80*time.Millisecond)
testCases := []struct {
name string
txn *kv.Txn
lh *roachpb.ReplicaDescriptor
ctPolicy roachpb.RangeClosedTimestampPolicy
disabledEnterprise bool
disabledFollowerReads bool
exp roachpb.ReplicaDescriptor
}{
{
name: "non-txn, known leaseholder",
txn: nil,
lh: &leaseholder,
exp: leaseholder,
},
{
name: "non-txn, unknown leaseholder",
txn: nil,
exp: closestFollower,
},
{
name: "stale txn, known leaseholder",
txn: staleTxn,
lh: &leaseholder,
exp: closestFollower,
},
{
name: "stale txn, unknown leaseholder",
txn: staleTxn,
exp: closestFollower,
},
{
name: "current txn, known leaseholder",
txn: currentTxn,
lh: &leaseholder,
exp: leaseholder,
},
{
name: "current txn, unknown leaseholder",
txn: currentTxn,
exp: closestFollower,
},
{
name: "future txn, known leaseholder",
txn: futureTxn,
lh: &leaseholder,
exp: leaseholder,
},
{
name: "future txn, unknown leaseholder",
txn: futureTxn,
exp: closestFollower,
},
{
name: "stale txn, known leaseholder, global reads policy",
txn: staleTxn,
ctPolicy: roachpb.LEAD_FOR_GLOBAL_READS,
lh: &leaseholder,
exp: closestFollower,
},
{
name: "stale txn, unknown leaseholder, global reads policy",
txn: staleTxn,
ctPolicy: roachpb.LEAD_FOR_GLOBAL_READS,
exp: closestFollower,
},
{
name: "current txn, known leaseholder, global reads policy",
txn: currentTxn,
ctPolicy: roachpb.LEAD_FOR_GLOBAL_READS,
lh: &leaseholder,
exp: closestFollower,
},
{
name: "current txn, unknown leaseholder, global reads policy",
txn: currentTxn,
ctPolicy: roachpb.LEAD_FOR_GLOBAL_READS,
exp: closestFollower,
},
{
name: "future txn, known leaseholder, global reads policy",
txn: futureTxn,
ctPolicy: roachpb.LEAD_FOR_GLOBAL_READS,
lh: &leaseholder,
exp: leaseholder,
},
{
name: "future txn, unknown leaseholder, global reads policy",
txn: futureTxn,
ctPolicy: roachpb.LEAD_FOR_GLOBAL_READS,
exp: closestFollower,
},
{
name: "stale txn, non-enterprise",
txn: staleTxn,
lh: &leaseholder,
disabledEnterprise: true,
exp: leaseholder,
},
{
name: "stale txn, follower reads disabled",
txn: staleTxn,
lh: &leaseholder,
disabledFollowerReads: true,
exp: leaseholder,
},
}
for _, c := range testCases {
t.Run(c.name, func(t *testing.T) {
if !c.disabledEnterprise {
defer utilccl.TestingEnableEnterprise()()
}
st := cluster.MakeTestingClusterSettings()
kvserver.FollowerReadsEnabled.Override(ctx, &st.SV, !c.disabledFollowerReads)
o := replicaoracle.NewOracle(followerReadOraclePolicy, replicaoracle.Config{
NodeDescs: nodes,
Settings: st,
RPCContext: rpcContext,
Clock: clock,
})
res, err := o.ChoosePreferredReplica(ctx, c.txn, desc, c.lh, c.ctPolicy, replicaoracle.QueryState{})
require.NoError(t, err)
require.Equal(t, c.exp, res)
})
}
}
// Test that follower reads recover from a situation where a gateway node has
// the right leaseholder cached, but stale followers. This is an integration
// test checking that the cache on the gateway gets updated by the first request
// encountering this situation, and then follower reads work.
func TestFollowerReadsWithStaleDescriptor(t *testing.T) {
defer leaktest.AfterTest(t)()
ctx := context.Background()
// The test uses follower_read_timestamp().
defer utilccl.TestingEnableEnterprise()()
historicalQuery := `SELECT * FROM test AS OF SYSTEM TIME follower_read_timestamp() WHERE k=2`
recCh := make(chan tracingpb.Recording, 1)
var n2Addr, n3Addr syncutil.AtomicString
tc := testcluster.StartTestCluster(t, 4,
base.TestClusterArgs{
ReplicationMode: base.ReplicationManual,
ServerArgs: base.TestServerArgs{
DisableDefaultTestTenant: true,
UseDatabase: "t",
},
// n4 pretends to have low latency to n2 and n3, so that it tries to use
// them for follower reads.
// Also, we're going to collect a trace of the test's final query.
ServerArgsPerNode: map[int]base.TestServerArgs{
3: {
DisableDefaultTestTenant: true,
UseDatabase: "t",
Knobs: base.TestingKnobs{
KVClient: &kvcoord.ClientTestingKnobs{
// Inhibit the checking of connection health done by the
// GRPCTransport. This test wants to control what replica (which
// follower) a request is sent to and, depending on timing, the
// connection from n4 to the respective follower might not be
// heartbeated by the time the test wants to use it. Without this
// knob, that would cause the transport to reorder replicas.
DontConsiderConnHealth: true,
LatencyFunc: func(addr string) (time.Duration, bool) {
if (addr == n2Addr.Get()) || (addr == n3Addr.Get()) {
return time.Millisecond, true
}
return 100 * time.Millisecond, true
},
},
SQLExecutor: &sql.ExecutorTestingKnobs{
WithStatementTrace: func(trace tracingpb.Recording, stmt string) {
if stmt == historicalQuery {
recCh <- trace
}
},
},
},
},
},
})
defer tc.Stopper().Stop(ctx)
n2Addr.Set(tc.Servers[1].RPCAddr())
n3Addr.Set(tc.Servers[2].RPCAddr())
n1 := sqlutils.MakeSQLRunner(tc.Conns[0])
n1.Exec(t, `CREATE DATABASE t`)
n1.Exec(t, `CREATE TABLE test (k INT PRIMARY KEY)`)
n1.Exec(t, `ALTER TABLE test EXPERIMENTAL_RELOCATE VOTERS VALUES (ARRAY[1,2], 1)`)
// Speed up closing of timestamps, in order to sleep less below before we can
// use follower_read_timestamp(). follower_read_timestamp() uses the sum of
// the following settings.
n1.Exec(t, `SET CLUSTER SETTING kv.closed_timestamp.target_duration = '0.1s'`)
n1.Exec(t, `SET CLUSTER SETTING kv.closed_timestamp.side_transport_interval = '0.1s'`)
n1.Exec(t, `SET CLUSTER SETTING kv.closed_timestamp.propagation_slack = '0.1s'`)
// Sleep so that we can perform follower reads. The read timestamp needs to be
// above the timestamp when the table was created.
log.Infof(ctx, "test sleeping for the follower read timestamps to pass the table creation timestamp...")
time.Sleep(300 * time.Millisecond)
log.Infof(ctx, "test sleeping... done")
// Run a query on n4 to populate its cache.
n4 := sqlutils.MakeSQLRunner(tc.Conns[3])
n4.Exec(t, "SELECT * from test WHERE k=1")
// Check that the cache was indeed populated.
var tableID uint32
n1.QueryRow(t, `SELECT id from system.namespace WHERE name='test'`).Scan(&tableID)
tablePrefix := keys.MustAddr(keys.SystemSQLCodec.TablePrefix(tableID))
n4Cache := tc.Server(3).DistSenderI().(*kvcoord.DistSender).RangeDescriptorCache()
entry := n4Cache.GetCached(ctx, tablePrefix, false /* inverted */)
require.NotNil(t, entry)
require.False(t, entry.Lease().Empty())
require.Equal(t, roachpb.StoreID(1), entry.Lease().Replica.StoreID)
require.Equal(t, []roachpb.ReplicaDescriptor{
{NodeID: 1, StoreID: 1, ReplicaID: 1},
{NodeID: 2, StoreID: 2, ReplicaID: 2},
}, entry.Desc().Replicas().Descriptors())
// Remove the follower and add a new non-voter to n3. n2 will no longer have a
// replica.
n1.Exec(t, `ALTER TABLE test EXPERIMENTAL_RELOCATE VOTERS VALUES (ARRAY[1], 1)`)
n1.Exec(t, `ALTER TABLE test EXPERIMENTAL_RELOCATE NONVOTERS VALUES (ARRAY[3], 1)`)
// Execute the query again and assert the cache is updated. This query will
// not be executed as a follower read since it attempts to use n2 which
// doesn't have a replica any more and then it tries n1 which returns an
// updated descriptor.
n4.Exec(t, historicalQuery)
// As a sanity check, verify that this was not a follower read.
rec := <-recCh
require.False(t, kv.OnlyFollowerReads(rec), "query was served through follower reads: %s", rec)
// Check that the cache was properly updated.
entry = n4Cache.GetCached(ctx, tablePrefix, false /* inverted */)
require.NotNil(t, entry)
require.False(t, entry.Lease().Empty())
require.Equal(t, roachpb.StoreID(1), entry.Lease().Replica.StoreID)
require.Equal(t, []roachpb.ReplicaDescriptor{
{NodeID: 1, StoreID: 1, ReplicaID: 1},
{NodeID: 3, StoreID: 3, ReplicaID: 3, Type: roachpb.NON_VOTER},
}, entry.Desc().Replicas().Descriptors())
// Make a note of the follower reads metric on n3. We'll check that it was
// incremented.
var followerReadsCountBefore int64
err := tc.Servers[2].Stores().VisitStores(func(s *kvserver.Store) error {
followerReadsCountBefore = s.Metrics().FollowerReadsCount.Count()
return nil
})
require.NoError(t, err)
// Run a historical query and assert that it's served from the follower (n3).
// n4 should attempt to route to n3 because we pretend n3 has a lower latency
// (see testing knob).
n4.Exec(t, historicalQuery)
rec = <-recCh
// Look at the trace and check that we've served a follower read.
require.True(t, kv.OnlyFollowerReads(rec), "query was not served through follower reads: %s", rec)
// Check that the follower read metric was incremented.
var followerReadsCountAfter int64
err = tc.Servers[2].Stores().VisitStores(func(s *kvserver.Store) error {
followerReadsCountAfter = s.Metrics().FollowerReadsCount.Count()
return nil
})
require.NoError(t, err)
require.Greater(t, followerReadsCountAfter, followerReadsCountBefore)
}
// TestSecondaryTenantFollowerReadsRouting ensures that secondary tenants route
// their requests to the nearest replica. The test runs two versions -- one
// where accurate latency information between nodes is available and another
// where it needs to be estimated using node localities.
func TestSecondaryTenantFollowerReadsRouting(t *testing.T) {
defer leaktest.AfterTest(t)()
defer utilccl.TestingEnableEnterprise()()
skip.UnderStressRace(t, "times out")
testutils.RunTrueAndFalse(t, "valid-latency-func", func(t *testing.T, validLatencyFunc bool) {
const numNodes = 4
serverArgs := make(map[int]base.TestServerArgs)
localities := make(map[int]roachpb.Locality)
for i := 0; i < numNodes; i++ {
regionName := fmt.Sprintf("region_%d", i)
if i == 3 {
// Make it such that n4 and n2 are in the same region. Below, we'll
// expect a follower read from n4 to be served by n2 because they're
// in the same locality (when validLatencyFunc is false).
regionName = fmt.Sprintf("region_%d", 1)
}
locality := roachpb.Locality{
Tiers: []roachpb.Tier{{Key: "region", Value: regionName}},
}
localities[i] = locality
serverArgs[i] = base.TestServerArgs{
Locality: localities[i],
DisableDefaultTestTenant: true, // we'll create one ourselves below.
}
}
tc := testcluster.StartTestCluster(t, numNodes, base.TestClusterArgs{
ReplicationMode: base.ReplicationManual,
ServerArgsPerNode: serverArgs,
})
ctx := context.Background()
defer tc.Stopper().Stop(ctx)
historicalQuery := `SELECT * FROM t.test AS OF SYSTEM TIME follower_read_timestamp() WHERE k=2`
recCh := make(chan tracingpb.Recording, 1)
var tenants [numNodes]serverutils.TestTenantInterface
for i := 0; i < numNodes; i++ {
knobs := base.TestingKnobs{}
if i == 3 { // n4
knobs = base.TestingKnobs{
KVClient: &kvcoord.ClientTestingKnobs{
DontConsiderConnHealth: true,
// For the validLatencyFunc=true version of the test, the client
// pretends to have a low latency connection to n2. As a result, we
// expect n2 to be used for follower reads originating from n4.
//
// For the variant where no latency information is available, we
// expect n2 to serve follower reads as well, but because it
// is in the same locality as the client.
LatencyFunc: func(addr string) (time.Duration, bool) {
if !validLatencyFunc {
return 0, false
}
if addr == tc.Server(1).RPCAddr() {
return time.Millisecond, true
}
return 100 * time.Millisecond, true
},
},
SQLExecutor: &sql.ExecutorTestingKnobs{
WithStatementTrace: func(trace tracingpb.Recording, stmt string) {
if stmt == historicalQuery {
recCh <- trace
}
},
},
}
}
tt, err := tc.Server(i).StartTenant(ctx, base.TestTenantArgs{
TenantID: serverutils.TestTenantID(),
Locality: localities[i],
TestingKnobs: knobs,
})
require.NoError(t, err)
tenants[i] = tt
}
// Speed up closing of timestamps in order to sleep less below before we can
// use follower_read_timestamp(). Note that we need to override the setting
// for the tenant as well, because the builtin is run in the tenant's sql pod.
systemSQL := sqlutils.MakeSQLRunner(tc.Conns[0])
systemSQL.Exec(t, `SET CLUSTER SETTING kv.closed_timestamp.target_duration = '0.1s'`)
systemSQL.Exec(t, `SET CLUSTER SETTING kv.closed_timestamp.side_transport_interval = '0.1s'`)
systemSQL.Exec(t, `SET CLUSTER SETTING kv.closed_timestamp.propagation_slack = '0.1s'`)
systemSQL.Exec(t, `ALTER TENANT ALL SET CLUSTER SETTING kv.closed_timestamp.target_duration = '0.1s'`)
systemSQL.Exec(t, `ALTER TENANT ALL SET CLUSTER SETTING kv.closed_timestamp.side_transport_interval = '0.1s'`)
systemSQL.Exec(t, `ALTER TENANT ALL SET CLUSTER SETTING kv.closed_timestamp.propagation_slack = '0.1s'`)
// We're making assertions on traces collected by the tenant using log lines
// in KV so we must ensure they're not redacted.
systemSQL.Exec(t, `SET CLUSTER SETTING server.secondary_tenants.redact_trace.enabled = 'false'`)
// Wait until all tenant servers are aware of the setting override.
testutils.SucceedsSoon(t, func() error {
settingNames := []string{
"kv.closed_timestamp.target_duration", "kv.closed_timestamp.side_transport_interval", "kv.closed_timestamp.propagation_slack",
}
for _, settingName := range settingNames {
for i := 0; i < numNodes; i++ {
pgURL, cleanup := sqlutils.PGUrl(t, tenants[i].SQLAddr(), "Tenant", url.User(username.RootUser))
defer cleanup()
db, err := gosql.Open("postgres", pgURL.String())
if err != nil {
t.Fatal(err)
}
defer db.Close()
var val string
err = db.QueryRow(
fmt.Sprintf("SHOW CLUSTER SETTING %s", settingName),
).Scan(&val)
require.NoError(t, err)
if val != "00:00:00.1" {
return errors.Errorf("tenant server %d is still waiting for %s update: currently %s",
i,
settingName,
val,
)
}
}
}
return nil
})
pgURL, cleanupPGUrl := sqlutils.PGUrl(
t, tenants[3].SQLAddr(), "Tenant", url.User(username.RootUser),
)
defer cleanupPGUrl()
tenantSQLDB, err := gosql.Open("postgres", pgURL.String())
require.NoError(t, err)
defer tenantSQLDB.Close()
tenantSQL := sqlutils.MakeSQLRunner(tenantSQLDB)
tenantSQL.Exec(t, `CREATE DATABASE t`)
tenantSQL.Exec(t, `CREATE TABLE t.test (k INT PRIMARY KEY)`)
startKey := keys.MakeSQLCodec(serverutils.TestTenantID()).TenantPrefix()
tc.AddVotersOrFatal(t, startKey, tc.Target(1), tc.Target(2))
desc := tc.LookupRangeOrFatal(t, startKey)
require.Equal(t, []roachpb.ReplicaDescriptor{
{NodeID: 1, StoreID: 1, ReplicaID: 1},
{NodeID: 2, StoreID: 2, ReplicaID: 2},
{NodeID: 3, StoreID: 3, ReplicaID: 3},
}, desc.Replicas().Descriptors())
// Sleep so that we can perform follower reads. The read timestamp needs to be
// above the timestamp when the table was created.
log.Infof(ctx, "test sleeping for the follower read timestamps to pass the table creation timestamp...")
time.Sleep(500 * time.Millisecond)
log.Infof(ctx, "test sleeping... done")
getFollowerReadCounts := func() [numNodes]int64 {
var counts [numNodes]int64
for i := range tc.Servers {
err := tc.Servers[i].Stores().VisitStores(func(s *kvserver.Store) error {
counts[i] = s.Metrics().FollowerReadsCount.Count()
return nil
})
require.NoError(t, err)
}
return counts
}
// Check that the cache was indeed populated.
tenantSQL.Exec(t, `SELECT * FROM t.test WHERE k = 1`)
tablePrefix := keys.MustAddr(keys.MakeSQLCodec(serverutils.TestTenantID()).TenantPrefix())
cache := tenants[3].DistSenderI().(*kvcoord.DistSender).RangeDescriptorCache()
entry := cache.GetCached(ctx, tablePrefix, false /* inverted */)
require.NotNil(t, entry)
require.False(t, entry.Lease().Empty())
require.Equal(t, roachpb.StoreID(1), entry.Lease().Replica.StoreID)
require.Equal(t, []roachpb.ReplicaDescriptor{
{NodeID: 1, StoreID: 1, ReplicaID: 1},
{NodeID: 2, StoreID: 2, ReplicaID: 2},
{NodeID: 3, StoreID: 3, ReplicaID: 3},
}, entry.Desc().Replicas().Descriptors())
followerReadCountsBefore := getFollowerReadCounts()
tenantSQL.Exec(t, historicalQuery)
followerReadsCountsAfter := getFollowerReadCounts()
rec := <-recCh
// Look at the trace and check that we've served a follower read.
require.True(t, kv.OnlyFollowerReads(rec), "query was served through follower reads: %s", rec)
for i := 0; i < numNodes; i++ {
if i == 1 { // n2
require.Greater(t, followerReadsCountsAfter[i], followerReadCountsBefore[i])
continue
}
require.Equal(t, followerReadsCountsAfter[i], followerReadCountsBefore[i])
}
})
}