seaweedfs/weed/mq/coordinator/coordinator.go

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2023-10-02 08:02:27 +00:00
package coordinator
import (
cmap "github.com/orcaman/concurrent-map/v2"
"github.com/seaweedfs/seaweedfs/weed/mq/topic"
)
type ConsumerGroupInstance struct {
ClientId string
// the consumer group instance may not have an active partition
Partition *topic.Partition
// processed message count
ProcessedMessageCount int64
}
type ConsumerGroup struct {
// map a client id to a consumer group instance
ConsumerGroupInstances cmap.ConcurrentMap[string, *ConsumerGroupInstance]
MinimumActiveInstances int32
MaximumActiveInstances int32
}
type TopicConsumerGroups struct {
// map a consumer group name to a consumer group
ConsumerGroups cmap.ConcurrentMap[string, *ConsumerGroup]
}
// Coordinator coordinates the instances in the consumer group for one topic.
// It is responsible for:
// 1. Assigning partitions to consumer instances.
// 2. Reassigning partitions when a consumer instance is down.
// 3. Reassigning partitions when a consumer instance is up.
type Coordinator struct {
// map client id to subscriber
Subscribers cmap.ConcurrentMap[string, *ConsumerGroupInstance]
// map topic name to consumer groups
TopicSubscribers cmap.ConcurrentMap[string, map[string]TopicConsumerGroups]
}