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55 lines
1.8 KiB
Go
55 lines
1.8 KiB
Go
package pub_balancer
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import (
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"errors"
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"github.com/seaweedfs/seaweedfs/weed/pb/mq_pb"
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)
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var (
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ErrNoBroker = errors.New("no broker")
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)
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func (balancer *Balancer) LookupOrAllocateTopicPartitions(topic *mq_pb.Topic, publish bool, partitionCount int32) (assignments []*mq_pb.BrokerPartitionAssignment, err error) {
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if partitionCount == 0 {
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partitionCount = 6
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}
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// find existing topic partition assignments
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for brokerStatsItem := range balancer.Brokers.IterBuffered() {
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broker, brokerStats := brokerStatsItem.Key, brokerStatsItem.Val
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for topicPartitionStatsItem := range brokerStats.TopicPartitionStats.IterBuffered() {
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topicPartitionStat := topicPartitionStatsItem.Val
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if topicPartitionStat.TopicPartition.Namespace == topic.Namespace &&
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topicPartitionStat.TopicPartition.Name == topic.Name {
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assignment := &mq_pb.BrokerPartitionAssignment{
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Partition: &mq_pb.Partition{
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RingSize: MaxPartitionCount,
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RangeStart: topicPartitionStat.RangeStart,
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RangeStop: topicPartitionStat.RangeStop,
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},
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}
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// TODO fix follower setting
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assignment.LeaderBroker = broker
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assignments = append(assignments, assignment)
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}
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}
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}
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if len(assignments) > 0 || !(publish && len(assignments) !=int(partitionCount) && partitionCount > 0) {
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// glog.V(0).Infof("existing topic partitions %d: %v", len(assignments), assignments)
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return assignments, nil
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}
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// find the topic partitions on the filer
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// if the topic is not found
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// if the request is_for_publish
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// create the topic
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// if the request is_for_subscribe
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// return error not found
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// t := topic.FromPbTopic(request.Topic)
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if balancer.Brokers.IsEmpty() {
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return nil, ErrNoBroker
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}
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assignments = allocateTopicPartitions(balancer.Brokers, partitionCount)
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balancer.OnPartitionChange(topic, assignments)
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return
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}
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