mirror of
https://github.com/seaweedfs/seaweedfs.git
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94 lines
2.8 KiB
Go
94 lines
2.8 KiB
Go
package sub_client
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import (
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"github.com/seaweedfs/seaweedfs/weed/glog"
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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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"sync"
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"time"
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)
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type ProcessorState struct {
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}
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// Subscribe subscribes to a topic's specified partitions.
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// If a partition is moved to another broker, the subscriber will automatically reconnect to the new broker.
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func (sub *TopicSubscriber) Subscribe() error {
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go sub.startProcessors()
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// loop forever
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sub.doKeepConnectedToSubCoordinator()
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return nil
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}
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func (sub *TopicSubscriber) startProcessors() {
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// listen to the messages from the sub coordinator
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// start one processor per partition
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var wg sync.WaitGroup
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semaphore := make(chan struct{}, sub.ProcessorConfig.MaxPartitionCount)
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for assigned := range sub.brokerPartitionAssignmentChan {
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wg.Add(1)
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semaphore <- struct{}{}
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topicPartition := topic.FromPbPartition(assigned.Partition)
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// wait until no covering partition is still in progress
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sub.waitUntilNoOverlappingPartitionInFlight(topicPartition)
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// start a processors
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sub.activeProcessorsLock.Lock()
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sub.activeProcessors[topicPartition] = &ProcessorState{}
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sub.activeProcessorsLock.Unlock()
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go func(assigned *mq_pb.BrokerPartitionAssignment, topicPartition topic.Partition) {
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defer func() {
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sub.activeProcessorsLock.Lock()
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delete(sub.activeProcessors, topicPartition)
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sub.activeProcessorsLock.Unlock()
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<-semaphore
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wg.Done()
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}()
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glog.V(0).Infof("subscriber %s/%s assigned partition %+v at %v", sub.ContentConfig.Topic, sub.SubscriberConfig.ConsumerGroup, assigned.Partition, assigned.LeaderBroker)
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err := sub.onEachPartition(assigned)
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if err != nil {
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glog.V(0).Infof("subscriber %s/%s partition %+v at %v: %v", sub.ContentConfig.Topic, sub.SubscriberConfig.ConsumerGroup, assigned.Partition, assigned.LeaderBroker, err)
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} else {
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glog.V(0).Infof("subscriber %s/%s partition %+v at %v completed", sub.ContentConfig.Topic, sub.SubscriberConfig.ConsumerGroup, assigned.Partition, assigned.LeaderBroker)
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}
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}(assigned, topicPartition)
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}
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wg.Wait()
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}
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func (sub *TopicSubscriber) waitUntilNoOverlappingPartitionInFlight(topicPartition topic.Partition) {
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foundOverlapping := true
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for foundOverlapping {
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sub.activeProcessorsLock.Lock()
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foundOverlapping = false
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var overlappedPartition topic.Partition
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for partition, _ := range sub.activeProcessors {
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if partition.Overlaps(topicPartition) {
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if partition.Equals(topicPartition) {
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continue
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}
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foundOverlapping = true
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overlappedPartition = partition
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break
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}
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}
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sub.activeProcessorsLock.Unlock()
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if foundOverlapping {
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glog.V(0).Infof("subscriber %s new partition %v waiting for partition %+v to complete", sub.ContentConfig.Topic, topicPartition, overlappedPartition)
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time.Sleep(1 * time.Second)
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}
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}
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}
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