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
2023-12-11 12:05:54 -08:00
parent 8784553501
commit 580940bf82
58 changed files with 3853 additions and 2752 deletions
--- a/weed/mq/pub_balancer/balance.go
+++ b/weed/mq/pub_balancer/balance.go
@@ -0,0 +1,73 @@
+package pub_balancer
+
+import (
+	"github.com/seaweedfs/seaweedfs/weed/mq/topic"
+	"google.golang.org/grpc"
+)
+
+/*
+* Assuming a topic has [x,y] number of partitions when publishing, and there are b number of brokers.
+* and p is the number of partitions per topic.
+* if the broker number b <= x, then p = x.
+* if the broker number x < b < y, then x <= p <= b.
+* if the broker number b >= y, x <= p <= y
+
+Balance topic partitions to brokers
+===================================
+
+When the goal is to make sure that low traffic partitions can be merged, (and p >= x, and after last rebalance interval):
+1. Calculate the average load(throughput) of partitions per topic.
+2. If any two neighboring partitions have a load that is less than the average load, merge them.
+3. If min(b, y) < p, then merge two neighboring partitions that have the least combined load.
+
+When the goal is to make sure that high traffic partitions can be split, (and p < y and p < b, and after last rebalance interval):
+1. Calculate the average number of partitions per broker.
+2. If any partition has a load that is more than the average load, split it into two partitions.
+
+When the goal is to make sure that each broker has the same number of partitions:
+1. Calculate the average number of partitions per broker.
+2. For the brokers that have more than the average number of partitions, move the partitions to the brokers that have less than the average number of partitions.
+
+*/
+
+type BalanceAction interface {
+}
+type BalanceActionMerge struct {
+	Before []topic.TopicPartition
+	After  topic.TopicPartition
+}
+type BalanceActionSplit struct {
+	Before topic.TopicPartition
+	After  []topic.TopicPartition
+}
+
+type BalanceActionMove struct {
+	TopicPartition topic.TopicPartition
+	SourceBroker   string
+	TargetBroker   string
+}
+
+type BalanceActionCreate struct {
+	TopicPartition topic.TopicPartition
+	TargetBroker   string
+}
+
+// BalancePublishers check the stats of all brokers,
+// and balance the publishers to the brokers.
+func (balancer *Balancer) BalancePublishers() []BalanceAction {
+	action := BalanceTopicPartitionOnBrokers(balancer.Brokers)
+	return []BalanceAction{action}
+}
+
+func (balancer *Balancer) ExecuteBalanceAction(actions []BalanceAction, grpcDialOption grpc.DialOption) (err error) {
+	for _, action := range actions {
+		switch action.(type) {
+		case *BalanceActionMove:
+			err = balancer.ExecuteBalanceActionMove(action.(*BalanceActionMove), grpcDialOption)
+		}
+		if err != nil {
+			return err
+		}
+	}
+	return nil
+}