messaging: able to pub sub multiple partitions

weed/messaging/client/publisher.go

@@ -3,14 +3,38 @@ package client
 import (
 	"context"
 
+	"github.com/OneOfOne/xxhash"
+
 	"github.com/chrislusf/seaweedfs/weed/pb/messaging_pb"
 )
 
 type Publisher struct {
-	publishClient messaging_pb.SeaweedMessaging_PublishClient
+	publishClients     []messaging_pb.SeaweedMessaging_PublishClient
+	topicConfiguration *messaging_pb.TopicConfiguration
+	messageCount       uint64
+	publisherId        string
 }
 
-func (mc *MessagingClient) NewPublisher(namespace, topic string) (*Publisher, error) {
+func (mc *MessagingClient) NewPublisher(publisherId, namespace, topic string) (*Publisher, error) {
+	// read topic configuration
+	topicConfiguration := &messaging_pb.TopicConfiguration{
+		PartitionCount: 4,
+	}
+	publishClients := make([]messaging_pb.SeaweedMessaging_PublishClient, topicConfiguration.PartitionCount)
+	for i := 0; i < int(topicConfiguration.PartitionCount); i++ {
+		client, err := mc.setupPublisherClient(namespace, topic, int32(i))
+		if err != nil {
+			return nil, err
+		}
+		publishClients[i] = client
+	}
+	return &Publisher{
+		publishClients:     publishClients,
+		topicConfiguration: topicConfiguration,
+	}, nil
+}
+
+func (mc *MessagingClient) setupPublisherClient(namespace, topic string, partition int32) (messaging_pb.SeaweedMessaging_PublishClient, error) {
 
 	stream, err := messaging_pb.NewSeaweedMessagingClient(mc.grpcConnection).Publish(context.Background())
 	if err != nil {
@@ -22,7 +46,7 @@ func (mc *MessagingClient) NewPublisher(namespace, topic string) (*Publisher, er
 		Init: &messaging_pb.PublishRequest_InitMessage{
 			Namespace: namespace,
 			Topic:     topic,
-			Partition: 0,
+			Partition: partition,
 		},
 	})
 	if err != nil {
@@ -56,20 +80,34 @@ func (mc *MessagingClient) NewPublisher(namespace, topic string) (*Publisher, er
 		}
 	}()
 
-	return &Publisher{
-		publishClient: stream,
-	}, nil
+	return stream, nil
+
 }
 
 func (p *Publisher) Publish(m *messaging_pb.Message) error {
+	hashValue := p.messageCount
+	p.messageCount++
+	if p.topicConfiguration.Partitoning == messaging_pb.TopicConfiguration_NonNullKeyHash {
+		if m.Key != nil {
+			hashValue = xxhash.Checksum64(m.Key)
+		}
+	} else if p.topicConfiguration.Partitoning == messaging_pb.TopicConfiguration_KeyHash {
+		hashValue = xxhash.Checksum64(m.Key)
+	} else {
+		// round robin
+	}
 
-	return p.publishClient.Send(&messaging_pb.PublishRequest{
+	idx := int(hashValue) % len(p.publishClients)
+	if idx < 0 {
+		idx += len(p.publishClients)
+	}
+	return p.publishClients[idx].Send(&messaging_pb.PublishRequest{
 		Data: m,
 	})
-
 }
 
-func (p *Publisher) Close() error {
-
-	return p.publishClient.CloseSend()
+func (p *Publisher) Shutdown() {
+	for _, client := range p.publishClients {
+		client.CloseSend()
+	}
 }

weed/messaging/client/subscriber.go

@@ -9,10 +9,33 @@ import (
 )
 
 type Subscriber struct {
-	subscriberClient messaging_pb.SeaweedMessaging_SubscribeClient
+	subscriberClients []messaging_pb.SeaweedMessaging_SubscribeClient
+	subscriberId      string
 }
 
 func (mc *MessagingClient) NewSubscriber(subscriberId, namespace, topic string) (*Subscriber, error) {
+	// read topic configuration
+	topicConfiguration := &messaging_pb.TopicConfiguration{
+		PartitionCount: 4,
+	}
+	subscriberClients := make([]messaging_pb.SeaweedMessaging_SubscribeClient, topicConfiguration.PartitionCount)
+
+	for i := 0; i < int(topicConfiguration.PartitionCount); i++ {
+		client, err := mc.setupSubscriberClient(subscriberId, namespace, topic, int32(i))
+		if err != nil {
+			return nil, err
+		}
+		subscriberClients[i] = client
+	}
+
+	return &Subscriber{
+		subscriberClients: subscriberClients,
+		subscriberId:      subscriberId,
+	}, nil
+}
+
+func (mc *MessagingClient) setupSubscriberClient(subscriberId, namespace, topic string, partition int32) (messaging_pb.SeaweedMessaging_SubscribeClient, error) {
+
 	stream, err := messaging_pb.NewSeaweedMessagingClient(mc.grpcConnection).Subscribe(context.Background())
 	if err != nil {
 		return nil, err
@@ -23,7 +46,7 @@ func (mc *MessagingClient) NewSubscriber(subscriberId, namespace, topic string)
 		Init: &messaging_pb.SubscriberMessage_InitMessage{
 			Namespace:     namespace,
 			Topic:         topic,
-			Partition:     0,
+			Partition:     partition,
 			StartPosition: messaging_pb.SubscriberMessage_InitMessage_TIMESTAMP,
 			TimestampNs:   time.Now().UnixNano(),
 			SubscriberId:  subscriberId,
@@ -42,20 +65,27 @@ func (mc *MessagingClient) NewSubscriber(subscriberId, namespace, topic string)
 		// TODO follow redirection
 	}
 
-	return &Subscriber{
-		subscriberClient: stream,
-	}, nil
+	return stream, nil
+
 }
 
-func (s *Subscriber) Subscribe(processFn func(m *messaging_pb.Message)) error {
+func (s *Subscriber) doSubscribe(partition int, processFn func(m *messaging_pb.Message)) error {
 	for {
-		resp, listenErr := s.subscriberClient.Recv()
+		resp, listenErr := s.subscriberClients[partition].Recv()
 		if listenErr == io.EOF {
 			return nil
 		}
 		if listenErr != nil {
+			println(listenErr.Error())
 			return listenErr
 		}
 		processFn(resp.Data)
 	}
 }
+
+// Subscribe starts goroutines to process the messages
+func (s *Subscriber) Subscribe(processFn func(m *messaging_pb.Message)) {
+	for i:=0;i<len(s.subscriberClients);i++{
+		go s.doSubscribe(i, processFn)
+	}
+}

weed/pb/messaging.proto

@@ -103,4 +103,10 @@ message TopicConfiguration {
     string collection = 2;
     string replication = 3;
     bool is_transient = 4;
+    enum Partitioning {
+        NonNullKeyHash = 0; // If not null, hash by key value. If null, round robin
+        KeyHash = 1; // hash by key value
+        RoundRobin = 2; // round robin pick one partition
+    }
+    Partitioning partitoning = 5;
 }

weed/pb/messaging_pb/messaging.pb.go

@@ -68,6 +68,32 @@ func (SubscriberMessage_InitMessage_StartPosition) EnumDescriptor() ([]byte, []i
 	return fileDescriptor0, []int{0, 0, 0}
 }
 
+type TopicConfiguration_Partitioning int32
+
+const (
+	TopicConfiguration_NonNullKeyHash TopicConfiguration_Partitioning = 0
+	TopicConfiguration_KeyHash        TopicConfiguration_Partitioning = 1
+	TopicConfiguration_RoundRobin     TopicConfiguration_Partitioning = 2
+)
+
+var TopicConfiguration_Partitioning_name = map[int32]string{
+	0: "NonNullKeyHash",
+	1: "KeyHash",
+	2: "RoundRobin",
+}
+var TopicConfiguration_Partitioning_value = map[string]int32{
+	"NonNullKeyHash": 0,
+	"KeyHash":        1,
+	"RoundRobin":     2,
+}
+
+func (x TopicConfiguration_Partitioning) String() string {
+	return proto.EnumName(TopicConfiguration_Partitioning_name, int32(x))
+}
+func (TopicConfiguration_Partitioning) EnumDescriptor() ([]byte, []int) {
+	return fileDescriptor0, []int{9, 0}
+}
+
 type SubscriberMessage struct {
 	Init *SubscriberMessage_InitMessage `protobuf:"bytes,1,opt,name=init" json:"init,omitempty"`
 	Ack  *SubscriberMessage_AckMessage  `protobuf:"bytes,2,opt,name=ack" json:"ack,omitempty"`
@@ -445,10 +471,11 @@ func (m *GetTopicConfigurationResponse) GetConfiguration() *TopicConfiguration {
 }
 
 type TopicConfiguration struct {
-	PartitionCount int32  `protobuf:"varint,1,opt,name=partition_count,json=partitionCount" json:"partition_count,omitempty"`
-	Collection     string `protobuf:"bytes,2,opt,name=collection" json:"collection,omitempty"`
-	Replication    string `protobuf:"bytes,3,opt,name=replication" json:"replication,omitempty"`
-	IsTransient    bool   `protobuf:"varint,4,opt,name=is_transient,json=isTransient" json:"is_transient,omitempty"`
+	PartitionCount int32                           `protobuf:"varint,1,opt,name=partition_count,json=partitionCount" json:"partition_count,omitempty"`
+	Collection     string                          `protobuf:"bytes,2,opt,name=collection" json:"collection,omitempty"`
+	Replication    string                          `protobuf:"bytes,3,opt,name=replication" json:"replication,omitempty"`
+	IsTransient    bool                            `protobuf:"varint,4,opt,name=is_transient,json=isTransient" json:"is_transient,omitempty"`
+	Partitoning    TopicConfiguration_Partitioning `protobuf:"varint,5,opt,name=partitoning,enum=messaging_pb.TopicConfiguration_Partitioning" json:"partitoning,omitempty"`
 }
 
 func (m *TopicConfiguration) Reset()                    { *m = TopicConfiguration{} }
@@ -484,6 +511,13 @@ func (m *TopicConfiguration) GetIsTransient() bool {
 	return false
 }
 
+func (m *TopicConfiguration) GetPartitoning() TopicConfiguration_Partitioning {
+	if m != nil {
+		return m.Partitoning
+	}
+	return TopicConfiguration_NonNullKeyHash
+}
+
 func init() {
 	proto.RegisterType((*SubscriberMessage)(nil), "messaging_pb.SubscriberMessage")
 	proto.RegisterType((*SubscriberMessage_InitMessage)(nil), "messaging_pb.SubscriberMessage.InitMessage")
@@ -502,6 +536,7 @@ func init() {
 	proto.RegisterType((*GetTopicConfigurationResponse)(nil), "messaging_pb.GetTopicConfigurationResponse")
 	proto.RegisterType((*TopicConfiguration)(nil), "messaging_pb.TopicConfiguration")
 	proto.RegisterEnum("messaging_pb.SubscriberMessage_InitMessage_StartPosition", SubscriberMessage_InitMessage_StartPosition_name, SubscriberMessage_InitMessage_StartPosition_value)
+	proto.RegisterEnum("messaging_pb.TopicConfiguration_Partitioning", TopicConfiguration_Partitioning_name, TopicConfiguration_Partitioning_value)
 }
 
 // Reference imports to suppress errors if they are not otherwise used.
@@ -743,57 +778,62 @@ var _SeaweedMessaging_serviceDesc = grpc.ServiceDesc{
 func init() { proto.RegisterFile("messaging.proto", fileDescriptor0) }
 
 var fileDescriptor0 = []byte{
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