mirror of
https://github.com/seaweedfs/seaweedfs.git
synced 2024-01-19 02:48:24 +00:00
580940bf82
* 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
84 lines
3 KiB
Go
84 lines
3 KiB
Go
package pub_balancer
|
|
|
|
import (
|
|
cmap "github.com/orcaman/concurrent-map/v2"
|
|
"github.com/seaweedfs/seaweedfs/weed/pb/mq_pb"
|
|
)
|
|
|
|
const (
|
|
MaxPartitionCount = 8 * 9 * 5 * 7 //2520
|
|
LockBrokerBalancer = "broker_balancer"
|
|
)
|
|
|
|
// Balancer collects stats from all brokers.
|
|
//
|
|
// When publishers wants to create topics, it picks brokers to assign the topic partitions.
|
|
// When consumers wants to subscribe topics, it tells which brokers are serving the topic partitions.
|
|
//
|
|
// When a partition needs to be split or merged, or a partition needs to be moved to another broker,
|
|
// the balancer will let the broker tell the consumer instance to stop processing the partition.
|
|
// The existing consumer instance will flush the internal state, and then stop processing.
|
|
// Then the balancer will tell the brokers to start sending new messages in the new/moved partition to the consumer instances.
|
|
//
|
|
// Failover to standby consumer instances:
|
|
//
|
|
// A consumer group can have min and max number of consumer instances.
|
|
// For consumer instances joined after the max number, they will be in standby mode.
|
|
//
|
|
// When a consumer instance is down, the broker will notice this and inform the balancer.
|
|
// The balancer will then tell the broker to send the partition to another standby consumer instance.
|
|
type Balancer struct {
|
|
Brokers cmap.ConcurrentMap[string, *BrokerStats] // key: broker address
|
|
// Collected from all brokers when they connect to the broker leader
|
|
TopicToBrokers cmap.ConcurrentMap[string, *PartitionSlotToBrokerList] // key: topic name
|
|
}
|
|
func NewBalancer() *Balancer {
|
|
return &Balancer{
|
|
Brokers: cmap.New[*BrokerStats](),
|
|
TopicToBrokers: cmap.New[*PartitionSlotToBrokerList](),
|
|
}
|
|
}
|
|
|
|
func (balancer *Balancer) OnBrokerConnected(broker string) (brokerStats *BrokerStats) {
|
|
var found bool
|
|
brokerStats, found = balancer.Brokers.Get(broker)
|
|
if !found {
|
|
brokerStats = NewBrokerStats()
|
|
if !balancer.Brokers.SetIfAbsent(broker, brokerStats) {
|
|
brokerStats, _ = balancer.Brokers.Get(broker)
|
|
}
|
|
}
|
|
return brokerStats
|
|
}
|
|
|
|
func (balancer *Balancer) OnBrokerDisconnected(broker string, stats *BrokerStats) {
|
|
balancer.Brokers.Remove(broker)
|
|
|
|
// update TopicToBrokers
|
|
for _, topic := range stats.Topics {
|
|
partitionSlotToBrokerList, found := balancer.TopicToBrokers.Get(topic.String())
|
|
if !found {
|
|
continue
|
|
}
|
|
partitionSlotToBrokerList.RemoveBroker(broker)
|
|
}
|
|
}
|
|
|
|
func (balancer *Balancer) OnBrokerStatsUpdated(broker string, brokerStats *BrokerStats, receivedStats *mq_pb.BrokerStats) {
|
|
brokerStats.UpdateStats(receivedStats)
|
|
|
|
// update TopicToBrokers
|
|
for _, topicPartitionStats := range receivedStats.Stats {
|
|
topic := topicPartitionStats.Topic
|
|
partition := topicPartitionStats.Partition
|
|
partitionSlotToBrokerList, found := balancer.TopicToBrokers.Get(topic.String())
|
|
if !found {
|
|
partitionSlotToBrokerList = NewPartitionSlotToBrokerList(MaxPartitionCount)
|
|
if !balancer.TopicToBrokers.SetIfAbsent(topic.String(), partitionSlotToBrokerList) {
|
|
partitionSlotToBrokerList, _ = balancer.TopicToBrokers.Get(topic.String())
|
|
}
|
|
}
|
|
partitionSlotToBrokerList.AddBroker(partition, broker)
|
|
}
|
|
}
|