Revert "Merge branch 'master' into sub"

This reverts commit 4d414f54a2, reversing
changes made to 4827425146.

weed/mq/balancer/lookup.go

@@ -1,43 +0,0 @@
-package balancer
-
-import (
-	"github.com/seaweedfs/seaweedfs/weed/pb/mq_pb"
-)
-
-func (b *Balancer) LookupOrAllocateTopicPartitions(topic *mq_pb.Topic, publish bool) (assignments []*mq_pb.BrokerPartitionAssignment, err error) {
-	// find existing topic partition assignments
-	for brokerStatsItem := range b.Brokers.IterBuffered() {
-		broker, brokerStats := brokerStatsItem.Key, brokerStatsItem.Val
-		for topicPartitionStatsItem := range brokerStats.Stats.IterBuffered() {
-			topicPartitionStat := topicPartitionStatsItem.Val
-			if topicPartitionStat.TopicPartition.Namespace == topic.Namespace &&
-				topicPartitionStat.TopicPartition.Topic == topic.Name {
-				assignment := &mq_pb.BrokerPartitionAssignment{
-					Partition: &mq_pb.Partition{
-						RingSize:   MaxPartitionCount,
-						RangeStart: topicPartitionStat.RangeStart,
-						RangeStop:  topicPartitionStat.RangeStop,
-					},
-				}
-				if topicPartitionStat.IsLeader {
-					assignment.LeaderBroker = broker
-				} else {
-					assignment.FollowerBrokers = append(assignment.FollowerBrokers, broker)
-				}
-				assignments = append(assignments, assignment)
-			}
-		}
-	}
-	if len(assignments) > 0 {
-		return assignments, nil
-	}
-
-	// find the topic partitions on the filer
-	// if the topic is not found
-	//   if the request is_for_publish
-	//     create the topic
-	//   if the request is_for_subscribe
-	//     return error not found
-	// t := topic.FromPbTopic(request.Topic)
-	return allocateTopicPartitions(b.Brokers, 6), nil
-}