Merge accumulated changes related to message queue (#5098)

* balance partitions on brokers

* prepare topic partition first and then publish, move partition

* purge unused APIs

* clean up

* adjust logs

* add BalanceTopics() grpc API

* configure topic

* configure topic command

* refactor

* repair missing partitions

* sequence of operations to ensure ordering

* proto to close publishers and consumers

* rename file

* topic partition versioned by unixTimeNs

* create local topic partition

* close publishers

* randomize the client name

* wait until no publishers

* logs

* close stop publisher channel

* send last ack

* comments

* comment

* comments

* support list of brokers

* add cli options

* Update .gitignore

* logs

* return io.eof directly

* refactor

* optionally create topic

* refactoring

* detect consumer disconnection

* sub client wait for more messages

* subscribe by time stamp

* rename

* rename to sub_balancer

* rename

* adjust comments

* rename

* fix compilation

* rename

* rename

* SubscriberToSubCoordinator

* sticky rebalance

* go fmt

* add tests

* balance partitions on brokers

* prepare topic partition first and then publish, move partition

* purge unused APIs

* clean up

* adjust logs

* add BalanceTopics() grpc API

* configure topic

* configure topic command

* refactor

* repair missing partitions

* sequence of operations to ensure ordering

* proto to close publishers and consumers

* rename file

* topic partition versioned by unixTimeNs

* create local topic partition

* close publishers

* randomize the client name

* wait until no publishers

* logs

* close stop publisher channel

* send last ack

* comments

* comment

* comments

* support list of brokers

* add cli options

* Update .gitignore

* logs

* return io.eof directly

* refactor

* optionally create topic

* refactoring

* detect consumer disconnection

* sub client wait for more messages

* subscribe by time stamp

* rename

* rename to sub_balancer

* rename

* adjust comments

* rename

* fix compilation

* rename

* rename

* SubscriberToSubCoordinator

* sticky rebalance

* go fmt

* add tests

* tracking topic=>broker

* merge

* comment

3 files changed, 56 insertions, 10 deletions

diff --git a/weed/shell/command_mq_balance.go b/weed/shell/command_mq_balance.go
new file mode 100644
index 000000000..dbe218b54
--- /dev/null
+++ b/weed/shell/command_mq_balance.go
@@ -0,0 +1,46 @@
+package shell
+
+import (
+	"context"
+	"fmt"
+	"github.com/seaweedfs/seaweedfs/weed/pb"
+	"github.com/seaweedfs/seaweedfs/weed/pb/mq_pb"
+	"io"
+)
+
+func init() {
+	Commands = append(Commands, &commandMqBalanceTopics{})
+}
+
+type commandMqBalanceTopics struct {
+}
+
+func (c *commandMqBalanceTopics) Name() string {
+	return "mq.balance"
+}
+
+func (c *commandMqBalanceTopics) Help() string {
+	return `balance topic partitions
+
+`
+}
+
+func (c *commandMqBalanceTopics) Do(args []string, commandEnv *CommandEnv, writer io.Writer) error {
+
+	// find the broker balancer
+	brokerBalancer, err := findBrokerBalancer(commandEnv)
+	if err != nil {
+		return err
+	}
+	fmt.Fprintf(writer, "current balancer: %s\n", brokerBalancer)
+
+	// balance topics
+	return pb.WithBrokerGrpcClient(false, brokerBalancer, commandEnv.option.GrpcDialOption, func(client mq_pb.SeaweedMessagingClient) error {
+		_, err := client.BalanceTopics(context.Background(), &mq_pb.BalanceTopicsRequest{})
+		if err != nil {
+			return err
+		}
+		return nil
+	})
+
+}
diff --git a/weed/shell/command_mq_topic_create.go b/weed/shell/command_mq_topic_configure.go
index 7e1f5d65e..c5721d9d9 100644
--- a/weed/shell/command_mq_topic_create.go
+++ b/weed/shell/command_mq_topic_configure.go
@@ -11,25 +11,25 @@ import (
 )
 
 func init() {
-	Commands = append(Commands, &commandMqTopicCreate{})
+	Commands = append(Commands, &commandMqTopicConfigure{})
 }
 
-type commandMqTopicCreate struct {
+type commandMqTopicConfigure struct {
 }
 
-func (c *commandMqTopicCreate) Name() string {
-	return "mq.topic.create"
+func (c *commandMqTopicConfigure) Name() string {
+	return "mq.topic.configure"
 }
 
-func (c *commandMqTopicCreate) Help() string {
-	return `create a topic with a given name
+func (c *commandMqTopicConfigure) Help() string {
+	return `configure a topic with a given name
 
 	Example:
-		mq.topic.create -namespace <namespace> -topic <topic_name> -partition_count <partition_count>
+		mq.topic.configure -namespace <namespace> -topic <topic_name> -partition_count <partition_count>
 `
 }
 
-func (c *commandMqTopicCreate) Do(args []string, commandEnv *CommandEnv, writer io.Writer) error {
+func (c *commandMqTopicConfigure) Do(args []string, commandEnv *CommandEnv, writer io.Writer) error {
 
 	// parse parameters
 	mqCommand := flag.NewFlagSet(c.Name(), flag.ContinueOnError)
diff --git a/weed/shell/command_mq_topic_list.go b/weed/shell/command_mq_topic_list.go
index 5fb913a8a..cf6b97e96 100644
--- a/weed/shell/command_mq_topic_list.go
+++ b/weed/shell/command_mq_topic_list.go
@@ -3,7 +3,7 @@ package shell
 import (
 	"context"
 	"fmt"
-	"github.com/seaweedfs/seaweedfs/weed/mq/balancer"
+	"github.com/seaweedfs/seaweedfs/weed/mq/pub_balancer"
 	"github.com/seaweedfs/seaweedfs/weed/pb"
 	"github.com/seaweedfs/seaweedfs/weed/pb/filer_pb"
 	"github.com/seaweedfs/seaweedfs/weed/pb/mq_pb"
@@ -52,7 +52,7 @@ func (c *commandMqTopicList) Do(args []string, commandEnv *CommandEnv, writer io
 func findBrokerBalancer(commandEnv *CommandEnv) (brokerBalancer string, err error) {
 	err = commandEnv.WithFilerClient(false, func(client filer_pb.SeaweedFilerClient) error {
 		resp, err := client.FindLockOwner(context.Background(), &filer_pb.FindLockOwnerRequest{
-			Name: balancer.LockBrokerBalancer,
+			Name: pub_balancer.LockBrokerBalancer,
 		})
 		if err != nil {
 			return err