Remove offLineNodes from watch states check (#16347)

This PR also
- adds more information in log
- makes Session able to logged by zap.Any/zap.String
Signed-off-by: Nyangxuan <xuan.yang@zilliz.com>

internal/datacoord/channel_checker.go

@@ -101,14 +101,16 @@ func (c *channelStateTimer) startOne(watchState datapb.ChannelWatchState, channe
 		select {
 		case <-time.NewTimer(time.Until(timeoutT)).C:
 			log.Info("timeout and stop timer: wait for channel ACK timeout",
-				zap.String("state", watchState.String()),
+				zap.String("watch state", watchState.String()),
+				zap.Int64("nodeID", nodeID),
 				zap.String("channel name", channelName),
 				zap.Time("timeout time", timeoutT))
 			ackType := getAckType(watchState)
 			c.notifyTimeoutWatcher(&ackEvent{ackType, channelName, nodeID})
 		case <-stop:
 			log.Debug("stop timer before timeout",
-				zap.String("state", watchState.String()),
+				zap.String("watch state", watchState.String()),
+				zap.Int64("nodeID", nodeID),
 				zap.String("channel name", channelName),
 				zap.Time("timeout time", timeoutT))
 		}

internal/datacoord/channel_manager.go

@@ -121,7 +121,8 @@ func (c *ChannelManager) Startup(ctx context.Context, nodes []int64) error {
 	}
 
 	// Process watch states for old nodes.
-	if err := c.checkOldNodes(oNodes); err != nil {
+	oldOnLines := c.getOldOnlines(nodes, oNodes)
+	if err := c.checkOldNodes(oldOnLines); err != nil {
 		return err
 	}
 
@@ -152,8 +153,9 @@ func (c *ChannelManager) Startup(ctx context.Context, nodes []int64) error {
 	}
 
 	log.Info("cluster start up",
-		zap.Any("nodes", nodes),
-		zap.Any("oNodes", oNodes),
+		zap.Int64s("nodes", nodes),
+		zap.Int64s("oNodes", oNodes),
+		zap.Int64s("old onlines", oldOnLines),
 		zap.Int64s("new onlines", newOnLines),
 		zap.Int64s("offLines", offLines))
 	return nil
@@ -176,6 +178,10 @@ func (c *ChannelManager) checkOldNodes(nodes []UniqueID) error {
 		for _, info := range watchInfos {
 			channelName := info.GetVchan().GetChannelName()
 
+			log.Debug("processing watch info",
+				zap.String("watch state", info.GetState().String()),
+				zap.String("channel name", channelName))
+
 			switch info.GetState() {
 			case datapb.ChannelWatchState_ToWatch, datapb.ChannelWatchState_Uncomplete:
 				c.stateTimer.startOne(datapb.ChannelWatchState_ToWatch, channelName, nodeID, info.GetTimeoutTs())
@@ -257,6 +263,21 @@ func (c *ChannelManager) bgCheckChannelsWork(ctx context.Context) {
 	}
 }
 
+// getOldOnlines returns a list of old online node ids in `old` and in `curr`.
+func (c *ChannelManager) getOldOnlines(curr []int64, old []int64) []int64 {
+	mcurr := make(map[int64]struct{})
+	ret := make([]int64, 0, len(old))
+	for _, n := range curr {
+		mcurr[n] = struct{}{}
+	}
+	for _, n := range old {
+		if _, found := mcurr[n]; found {
+			ret = append(ret, n)
+		}
+	}
+	return ret
+}
+
 // getNewOnLines returns a list of new online node ids in `curr` but not in `old`.
 func (c *ChannelManager) getNewOnLines(curr []int64, old []int64) []int64 {
 	mold := make(map[int64]struct{})
@@ -571,21 +592,21 @@ func (c *ChannelManager) processAck(e *ackEvent) {
 		err := c.Release(e.nodeID, e.channelName)
 		if err != nil {
 			log.Warn("fail to set channels to release for watch failure ACKs",
-				zap.Int64("nodeID", e.nodeID), zap.String("channel name", e.channelName))
+				zap.Int64("nodeID", e.nodeID), zap.String("channel name", e.channelName), zap.Error(err))
 		}
 
 	case releaseFailAck, releaseTimeoutAck: // failure acks from toRelease
 		err := c.cleanUpAndDelete(e.nodeID, e.channelName)
 		if err != nil {
 			log.Warn("fail to clean and delete channels for release failure ACKs",
-				zap.Int64("nodeID", e.nodeID), zap.String("channel name", e.channelName))
+				zap.Int64("nodeID", e.nodeID), zap.String("channel name", e.channelName), zap.Error(err))
 		}
 
 	case releaseSuccessAck:
 		err := c.toDelete(e.nodeID, e.channelName)
 		if err != nil {
 			log.Warn("fail to response to release success ACK",
-				zap.Int64("nodeID", e.nodeID), zap.String("channel name", e.channelName))
+				zap.Int64("nodeID", e.nodeID), zap.String("channel name", e.channelName), zap.Error(err))
 		}
 	}
 }

internal/datacoord/channel_manager_test.go

@@ -788,3 +788,31 @@ func TestChannelManager_RemoveChannel(t *testing.T) {
 		})
 	}
 }
+
+func TestChannelManager_HelperFunc(t *testing.T) {
+	c := &ChannelManager{}
+	t.Run("test getOldOnlines", func(t *testing.T) {
+		tests := []struct {
+			nodes  []int64
+			oNodes []int64
+
+			expectedOut []int64
+			desription  string
+		}{
+			{[]int64{}, []int64{}, []int64{}, "empty both"},
+			{[]int64{1}, []int64{}, []int64{}, "empty oNodes"},
+			{[]int64{}, []int64{1}, []int64{}, "empty nodes"},
+			{[]int64{1}, []int64{1}, []int64{1}, "same one"},
+			{[]int64{1, 2}, []int64{1}, []int64{1}, "same one 2"},
+			{[]int64{1}, []int64{1, 2}, []int64{1}, "same one 3"},
+			{[]int64{1, 2}, []int64{1, 2}, []int64{1, 2}, "same two"},
+		}
+
+		for _, test := range tests {
+			t.Run(test.desription, func(t *testing.T) {
+				nodes := c.getOldOnlines(test.nodes, test.oNodes)
+				assert.ElementsMatch(t, test.expectedOut, nodes)
+			})
+		}
+	})
+}

internal/util/sessionutil/session_util.go

@@ -117,6 +117,11 @@ func (s *Session) Init(serverName, address string, exclusive bool, triggerKill b
 	s.ServerID = serverID
 }
 
+// String makes Session struct able to be logged by zap
+func (s *Session) String() string {
+	return fmt.Sprintf("Session:<ServerID: %d, ServerName: %s>", s.ServerID, s.ServerName)
+}
+
 // Register will process keepAliveResponse to keep alive with etcd.
 func (s *Session) Register() {
 	ch, err := s.registerService()

internal/util/sessionutil/session_util_test.go

@@ -12,10 +12,12 @@ import (
 	"time"
 
 	etcdkv "github.com/milvus-io/milvus/internal/kv/etcd"
+	"github.com/milvus-io/milvus/internal/log"
 	"github.com/milvus-io/milvus/internal/util/etcd"
 	"github.com/milvus-io/milvus/internal/util/paramtable"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
+	"go.uber.org/zap"
 
 	"go.etcd.io/etcd/api/v3/mvccpb"
 	clientv3 "go.etcd.io/etcd/client/v3"
@@ -399,3 +401,8 @@ func TestSession_Registered(t *testing.T) {
 	session.UpdateRegistered(true)
 	assert.True(t, session.Registered())
 }
+
+func TestSession_String(t *testing.T) {
+	s := &Session{}
+	log.Debug("log session", zap.Any("session", s))
+}