[release-16.0]: Fix flakiness in VTOrc tests (#13489) (#13528)

Signed-off-by: Manan Gupta <manan@planetscale.com>

go/test/endtoend/cluster/vtorc_process.go

@@ -37,14 +37,15 @@ import (
 // vtorc as a separate process for testing
 type VTOrcProcess struct {
 	VtctlProcess
-	Port       int
-	LogDir     string
-	ExtraArgs  []string
-	ConfigPath string
-	Config     VTOrcConfiguration
-	WebPort    int
-	proc       *exec.Cmd
-	exit       chan error
+	Port        int
+	LogDir      string
+	LogFileName string
+	ExtraArgs   []string
+	ConfigPath  string
+	Config      VTOrcConfiguration
+	WebPort     int
+	proc        *exec.Cmd
+	exit        chan error
 }
 
 type VTOrcConfiguration struct {
@@ -124,7 +125,10 @@ func (orc *VTOrcProcess) Setup() (err error) {
 	orc.proc.Args = append(orc.proc.Args, orc.ExtraArgs...)
 	orc.proc.Args = append(orc.proc.Args, "--alsologtostderr")
 
-	errFile, _ := os.Create(path.Join(orc.LogDir, fmt.Sprintf("orc-stderr-%d.txt", timeNow)))
+	if orc.LogFileName == "" {
+		orc.LogFileName = fmt.Sprintf("orc-stderr-%d.txt", timeNow)
+	}
+	errFile, _ := os.Create(path.Join(orc.LogDir, orc.LogFileName))
 	orc.proc.Stderr = errFile
 
 	orc.proc.Env = append(orc.proc.Env, os.Environ()...)

go/test/endtoend/vtorc/general/vtorc_test.go

@@ -37,6 +37,7 @@ import (
 // verify replication is setup
 // verify that with multiple vtorc instances, we still only have 1 PlannedReparentShard call
 func TestPrimaryElection(t *testing.T) {
+	defer utils.PrintVTOrcLogsOnFailure(t, clusterInfo.ClusterInstance)
 	defer cluster.PanicHandler(t)
 	utils.SetupVttabletsAndVTOrcs(t, clusterInfo, 2, 1, nil, cluster.VTOrcConfiguration{
 		PreventCrossDataCenterPrimaryFailover: true,
@@ -64,6 +65,7 @@ func TestPrimaryElection(t *testing.T) {
 // verify rdonly is not elected, only replica
 // verify replication is setup
 func TestSingleKeyspace(t *testing.T) {
+	defer utils.PrintVTOrcLogsOnFailure(t, clusterInfo.ClusterInstance)
 	defer cluster.PanicHandler(t)
 	utils.SetupVttabletsAndVTOrcs(t, clusterInfo, 1, 1, []string{"--clusters_to_watch", "ks"}, cluster.VTOrcConfiguration{
 		PreventCrossDataCenterPrimaryFailover: true,
@@ -81,6 +83,7 @@ func TestSingleKeyspace(t *testing.T) {
 // verify rdonly is not elected, only replica
 // verify replication is setup
 func TestKeyspaceShard(t *testing.T) {
+	defer utils.PrintVTOrcLogsOnFailure(t, clusterInfo.ClusterInstance)
 	defer cluster.PanicHandler(t)
 	utils.SetupVttabletsAndVTOrcs(t, clusterInfo, 1, 1, []string{"--clusters_to_watch", "ks/0"}, cluster.VTOrcConfiguration{
 		PreventCrossDataCenterPrimaryFailover: true,
@@ -100,6 +103,7 @@ func TestKeyspaceShard(t *testing.T) {
 // 4. setup replication from non-primary, let vtorc repair
 // 5. make instance A replicates from B and B from A, wait for repair
 func TestVTOrcRepairs(t *testing.T) {
+	defer utils.PrintVTOrcLogsOnFailure(t, clusterInfo.ClusterInstance)
 	defer cluster.PanicHandler(t)
 	utils.SetupVttabletsAndVTOrcs(t, clusterInfo, 3, 0, nil, cluster.VTOrcConfiguration{
 		PreventCrossDataCenterPrimaryFailover: true,
@@ -216,6 +220,7 @@ func TestVTOrcRepairs(t *testing.T) {
 func TestRepairAfterTER(t *testing.T) {
 	// test fails intermittently on CI, skip until it can be fixed.
 	t.SkipNow()
+	defer utils.PrintVTOrcLogsOnFailure(t, clusterInfo.ClusterInstance)
 	defer cluster.PanicHandler(t)
 	utils.SetupVttabletsAndVTOrcs(t, clusterInfo, 2, 0, nil, cluster.VTOrcConfiguration{
 		PreventCrossDataCenterPrimaryFailover: true,
@@ -252,6 +257,7 @@ func TestSemiSync(t *testing.T) {
 	// stop any vtorc instance running due to a previous test.
 	utils.StopVTOrcs(t, clusterInfo)
 	newCluster := utils.SetupNewClusterSemiSync(t)
+	defer utils.PrintVTOrcLogsOnFailure(t, newCluster.ClusterInstance)
 	utils.StartVTOrcs(t, newCluster, nil, cluster.VTOrcConfiguration{
 		PreventCrossDataCenterPrimaryFailover: true,
 	}, 1)
@@ -316,6 +322,7 @@ func TestSemiSync(t *testing.T) {
 
 // TestVTOrcWithPrs tests that VTOrc works fine even when PRS is called from vtctld
 func TestVTOrcWithPrs(t *testing.T) {
+	defer utils.PrintVTOrcLogsOnFailure(t, clusterInfo.ClusterInstance)
 	defer cluster.PanicHandler(t)
 	utils.SetupVttabletsAndVTOrcs(t, clusterInfo, 4, 0, nil, cluster.VTOrcConfiguration{
 		PreventCrossDataCenterPrimaryFailover: true,
@@ -364,6 +371,7 @@ func TestVTOrcWithPrs(t *testing.T) {
 
 // TestMultipleDurabilities tests that VTOrc works with 2 keyspaces having 2 different durability policies
 func TestMultipleDurabilities(t *testing.T) {
+	defer utils.PrintVTOrcLogsOnFailure(t, clusterInfo.ClusterInstance)
 	defer cluster.PanicHandler(t)
 	// Setup a normal cluster and start vtorc
 	utils.SetupVttabletsAndVTOrcs(t, clusterInfo, 1, 1, nil, cluster.VTOrcConfiguration{}, 1, "")
@@ -388,6 +396,7 @@ func TestDurabilityPolicySetLater(t *testing.T) {
 	// stop any vtorc instance running due to a previous test.
 	utils.StopVTOrcs(t, clusterInfo)
 	newCluster := utils.SetupNewClusterSemiSync(t)
+	defer utils.PrintVTOrcLogsOnFailure(t, newCluster.ClusterInstance)
 	keyspace := &newCluster.ClusterInstance.Keyspaces[0]
 	shard0 := &keyspace.Shards[0]
 	// Before starting VTOrc we explicity want to set the durability policy of the keyspace to an empty string

go/test/endtoend/vtorc/primaryfailure/primary_failure_test.go

@@ -32,8 +32,12 @@ import (
 // covers the test case master-failover from orchestrator
 // Also tests that VTOrc can handle multiple failures, if the durability policies allow it
 func TestDownPrimary(t *testing.T) {
+	defer utils.PrintVTOrcLogsOnFailure(t, clusterInfo.ClusterInstance)
 	defer cluster.PanicHandler(t)
-	utils.SetupVttabletsAndVTOrcs(t, clusterInfo, 2, 1, []string{"--remote_operation_timeout=10s"}, cluster.VTOrcConfiguration{
+	// We specify the --wait-replicas-timeout to a small value because we spawn a cross-cell replica later in the test.
+	// If that replica is more advanced than the same-cell-replica, then we try to promote the cross-cell replica as an intermediate source.
+	// If we don't specify a small value of --wait-replicas-timeout, then we would end up waiting for 30 seconds for the dead-primary to respond, failing this test.
+	utils.SetupVttabletsAndVTOrcs(t, clusterInfo, 2, 1, []string{"--remote_operation_timeout=10s", "--wait-replicas-timeout=5s"}, cluster.VTOrcConfiguration{
 		PreventCrossDataCenterPrimaryFailover: true,
 	}, 1, "semi_sync")
 	keyspace := &clusterInfo.ClusterInstance.Keyspaces[0]
@@ -90,6 +94,7 @@ func TestDownPrimary(t *testing.T) {
 // Failover should not be cross data centers, according to the configuration file
 // covers part of the test case master-failover-lost-replicas from orchestrator
 func TestCrossDataCenterFailure(t *testing.T) {
+	defer utils.PrintVTOrcLogsOnFailure(t, clusterInfo.ClusterInstance)
 	defer cluster.PanicHandler(t)
 	utils.SetupVttabletsAndVTOrcs(t, clusterInfo, 2, 1, nil, cluster.VTOrcConfiguration{
 		PreventCrossDataCenterPrimaryFailover: true,
@@ -135,6 +140,7 @@ func TestCrossDataCenterFailure(t *testing.T) {
 // Failover should not be cross data centers, according to the configuration file
 // In case of no viable candidates, we should error out
 func TestCrossDataCenterFailureError(t *testing.T) {
+	defer utils.PrintVTOrcLogsOnFailure(t, clusterInfo.ClusterInstance)
 	defer cluster.PanicHandler(t)
 	utils.SetupVttabletsAndVTOrcs(t, clusterInfo, 1, 1, nil, cluster.VTOrcConfiguration{
 		PreventCrossDataCenterPrimaryFailover: true,
@@ -181,6 +187,7 @@ func TestLostRdonlyOnPrimaryFailure(t *testing.T) {
 	// Earlier any replicas that were not able to replicate from the previous primary
 	// were detected by vtorc and could be configured to have their sources detached
 	t.Skip()
+	defer utils.PrintVTOrcLogsOnFailure(t, clusterInfo.ClusterInstance)
 	defer cluster.PanicHandler(t)
 	utils.SetupVttabletsAndVTOrcs(t, clusterInfo, 2, 2, nil, cluster.VTOrcConfiguration{
 		PreventCrossDataCenterPrimaryFailover: true,
@@ -262,6 +269,7 @@ func TestLostRdonlyOnPrimaryFailure(t *testing.T) {
 // This test checks that the promotion of a tablet succeeds if it passes the promotion lag test
 // covers the test case master-failover-fail-promotion-lag-minutes-success from orchestrator
 func TestPromotionLagSuccess(t *testing.T) {
+	defer utils.PrintVTOrcLogsOnFailure(t, clusterInfo.ClusterInstance)
 	defer cluster.PanicHandler(t)
 	utils.SetupVttabletsAndVTOrcs(t, clusterInfo, 2, 1, nil, cluster.VTOrcConfiguration{
 		ReplicationLagQuery:              "select 59",
@@ -311,6 +319,7 @@ func TestPromotionLagFailure(t *testing.T) {
 	// Earlier vtorc used to check that the promotion lag between the new primary and the old one
 	// was smaller than the configured value, otherwise it would fail the promotion
 	t.Skip()
+	defer utils.PrintVTOrcLogsOnFailure(t, clusterInfo.ClusterInstance)
 	defer cluster.PanicHandler(t)
 	utils.SetupVttabletsAndVTOrcs(t, clusterInfo, 3, 1, nil, cluster.VTOrcConfiguration{
 		ReplicationLagQuery:              "select 61",
@@ -363,6 +372,7 @@ func TestPromotionLagFailure(t *testing.T) {
 // We explicitly set one of the replicas to Prefer promotion rule.
 // That is the replica which should be promoted in case of primary failure
 func TestDownPrimaryPromotionRule(t *testing.T) {
+	defer utils.PrintVTOrcLogsOnFailure(t, clusterInfo.ClusterInstance)
 	defer cluster.PanicHandler(t)
 	utils.SetupVttabletsAndVTOrcs(t, clusterInfo, 2, 1, nil, cluster.VTOrcConfiguration{
 		LockShardTimeoutSeconds: 5,
@@ -410,6 +420,7 @@ func TestDownPrimaryPromotionRule(t *testing.T) {
 // That is the replica which should be promoted in case of primary failure
 // It should also be caught up when it is promoted
 func TestDownPrimaryPromotionRuleWithLag(t *testing.T) {
+	defer utils.PrintVTOrcLogsOnFailure(t, clusterInfo.ClusterInstance)
 	defer cluster.PanicHandler(t)
 	utils.SetupVttabletsAndVTOrcs(t, clusterInfo, 2, 1, nil, cluster.VTOrcConfiguration{
 		LockShardTimeoutSeconds: 5,
@@ -489,6 +500,7 @@ func TestDownPrimaryPromotionRuleWithLag(t *testing.T) {
 // We let a replica in our own cell lag. That is the replica which should be promoted in case of primary failure
 // It should also be caught up when it is promoted
 func TestDownPrimaryPromotionRuleWithLagCrossCenter(t *testing.T) {
+	defer utils.PrintVTOrcLogsOnFailure(t, clusterInfo.ClusterInstance)
 	defer cluster.PanicHandler(t)
 	utils.SetupVttabletsAndVTOrcs(t, clusterInfo, 2, 1, nil, cluster.VTOrcConfiguration{
 		LockShardTimeoutSeconds:               5,

go/test/endtoend/vtorc/readtopologyinstance/main_test.go

@@ -40,6 +40,7 @@ func TestReadTopologyInstanceBufferable(t *testing.T) {
 	defer func() {
 		clusterInfo.ClusterInstance.Teardown()
 	}()
+	defer utils.PrintVTOrcLogsOnFailure(t, clusterInfo.ClusterInstance)
 	keyspace := &clusterInfo.ClusterInstance.Keyspaces[0]
 	shard0 := &keyspace.Shards[0]
 	oldArgs := os.Args
@@ -146,7 +147,7 @@ func TestReadTopologyInstanceBufferable(t *testing.T) {
 	assert.Equal(t, replicaInstance.ReadBinlogCoordinates.LogFile, primaryInstance.SelfBinlogCoordinates.LogFile)
 	assert.Greater(t, replicaInstance.ReadBinlogCoordinates.LogPos, int64(0))
 	assert.Equal(t, replicaInstance.ExecBinlogCoordinates.LogFile, primaryInstance.SelfBinlogCoordinates.LogFile)
-	assert.LessOrEqual(t, replicaInstance.ExecBinlogCoordinates.LogPos, replicaInstance.ReadBinlogCoordinates.LogPos)
+	assert.Greater(t, replicaInstance.ExecBinlogCoordinates.LogPos, int64(0))
 	assert.Contains(t, replicaInstance.RelaylogCoordinates.LogFile, fmt.Sprintf("vt-0000000%d-relay", replica.TabletUID))
 	assert.Greater(t, replicaInstance.RelaylogCoordinates.LogPos, int64(0))
 	assert.Empty(t, replicaInstance.LastIOError)

go/test/endtoend/vtorc/utils/utils.go

@@ -946,3 +946,26 @@ func WaitForSuccessfulRecoveryCount(t *testing.T, vtorcInstance *cluster.VTOrcPr
 	successCount := successfulRecoveriesMap[recoveryName]
 	assert.EqualValues(t, countExpected, successCount)
 }
+
+// PrintVTOrcLogsOnFailure prints the VTOrc logs on failure of the test.
+// This function is supposed to be called as the first defer command from the vtorc tests.
+func PrintVTOrcLogsOnFailure(t *testing.T, clusterInstance *cluster.LocalProcessCluster) {
+	// If the test has not failed, then we don't need to print anything.
+	if !t.Failed() {
+		return
+	}
+
+	log.Errorf("Printing VTOrc logs")
+	for _, vtorc := range clusterInstance.VTOrcProcesses {
+		if vtorc == nil || vtorc.LogFileName == "" {
+			continue
+		}
+		filePath := path.Join(vtorc.LogDir, vtorc.LogFileName)
+		log.Errorf("Printing file - %s", filePath)
+		content, err := os.ReadFile(filePath)
+		if err != nil {
+			log.Errorf("Error while reading the file - %v", err)
+		}
+		log.Errorf("%s", string(content))
+	}
+}