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