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110 lines
3.4 KiB
Go
110 lines
3.4 KiB
Go
package balancer
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import (
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"fmt"
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cmap "github.com/orcaman/concurrent-map/v2"
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"github.com/seaweedfs/seaweedfs/weed/mq/topic"
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"github.com/seaweedfs/seaweedfs/weed/pb/mq_pb"
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)
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const (
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MaxPartitionCount = 8 * 9 * 5 * 7 //2520
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LockBrokerBalancer = "broker_balancer"
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)
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// Balancer collects stats from all brokers.
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//
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// When publishers wants to create topics, it picks brokers to assign the topic partitions.
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// When consumers wants to subscribe topics, it tells which brokers are serving the topic partitions.
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//
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// When a partition needs to be split or merged, or a partition needs to be moved to another broker,
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// the balancer will let the broker tell the consumer instance to stop processing the partition.
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// The existing consumer instance will flush the internal state, and then stop processing.
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// Then the balancer will tell the brokers to start sending new messages in the new/moved partition to the consumer instances.
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//
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// Failover to standby consumer instances:
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//
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// A consumer group can have min and max number of consumer instances.
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// For consumer instances joined after the max number, they will be in standby mode.
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//
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// When a consumer instance is down, the broker will notice this and inform the balancer.
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// The balancer will then tell the broker to send the partition to another standby consumer instance.
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type Balancer struct {
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Brokers cmap.ConcurrentMap[string, *BrokerStats]
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}
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type BrokerStats struct {
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TopicPartitionCount int32
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ConsumerCount int32
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CpuUsagePercent int32
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Stats cmap.ConcurrentMap[string, *TopicPartitionStats]
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}
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func (bs *BrokerStats) UpdateStats(stats *mq_pb.BrokerStats) {
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bs.TopicPartitionCount = int32(len(stats.Stats))
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bs.CpuUsagePercent = stats.CpuUsagePercent
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var consumerCount int32
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currentTopicPartitions := bs.Stats.Items()
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for _, topicPartitionStats := range stats.Stats {
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tps := &TopicPartitionStats{
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TopicPartition: topic.TopicPartition{
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Namespace: topicPartitionStats.Topic.Namespace,
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Topic: topicPartitionStats.Topic.Name,
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RangeStart: topicPartitionStats.Partition.RangeStart,
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RangeStop: topicPartitionStats.Partition.RangeStop,
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},
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ConsumerCount: topicPartitionStats.ConsumerCount,
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IsLeader: topicPartitionStats.IsLeader,
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}
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consumerCount += topicPartitionStats.ConsumerCount
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key := tps.TopicPartition.String()
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bs.Stats.Set(key, tps)
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delete(currentTopicPartitions, key)
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}
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// remove the topic partitions that are not in the stats
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for key := range currentTopicPartitions {
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bs.Stats.Remove(key)
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}
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bs.ConsumerCount = consumerCount
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}
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func (bs *BrokerStats) RegisterAssignment(t *mq_pb.Topic, partition *mq_pb.Partition) {
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tps := &TopicPartitionStats{
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TopicPartition: topic.TopicPartition{
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Namespace: t.Namespace,
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Topic: t.Name,
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RangeStart: partition.RangeStart,
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RangeStop: partition.RangeStop,
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},
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ConsumerCount: 0,
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IsLeader: true,
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}
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key := tps.TopicPartition.String()
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bs.Stats.Set(key, tps)
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}
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func (bs *BrokerStats) String() string {
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return fmt.Sprintf("BrokerStats{TopicPartitionCount:%d, ConsumerCount:%d, CpuUsagePercent:%d, Stats:%+v}",
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bs.TopicPartitionCount, bs.ConsumerCount, bs.CpuUsagePercent, bs.Stats.Items())
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}
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type TopicPartitionStats struct {
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topic.TopicPartition
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ConsumerCount int32
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IsLeader bool
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}
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func NewBalancer() *Balancer {
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return &Balancer{
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Brokers: cmap.New[*BrokerStats](),
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}
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}
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func NewBrokerStats() *BrokerStats {
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return &BrokerStats{
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Stats: cmap.New[*TopicPartitionStats](),
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}
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}
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