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package broker
import (
"context"
"github.com/chrislusf/seaweedfs/weed/cluster"
"github.com/chrislusf/seaweedfs/weed/glog"
"github.com/chrislusf/seaweedfs/weed/mq"
"github.com/chrislusf/seaweedfs/weed/pb"
"github.com/chrislusf/seaweedfs/weed/pb/master_pb"
"github.com/chrislusf/seaweedfs/weed/pb/mq_pb"
"sort"
"sync"
)
func (broker *MessageQueueBroker) FindBrokerLeader(c context.Context, request *mq_pb.FindBrokerLeaderRequest) (*mq_pb.FindBrokerLeaderResponse, error) {
ret := &mq_pb.FindBrokerLeaderResponse{}
err := broker.withMasterClient(false, broker.MasterClient.GetMaster(), func(client master_pb.SeaweedClient) error {
resp, err := client.ListClusterNodes(context.Background(), &master_pb.ListClusterNodesRequest{
ClientType: cluster.BrokerType,
FilerGroup: request.FilerGroup,
IsLeaderOnly: true,
})
if err != nil {
return err
}
if len(resp.ClusterNodes) == 0 {
return nil
}
ret.Broker = resp.ClusterNodes[0].Address
return nil
})
return ret, err
}
func (broker *MessageQueueBroker) CheckSegmentStatus(c context.Context, request *mq_pb.CheckSegmentStatusRequest) (*mq_pb.CheckSegmentStatusResponse, error) {
ret := &mq_pb.CheckSegmentStatusResponse{}
// TODO add in memory active segment
return ret, nil
}
func (broker *MessageQueueBroker) CheckBrokerLoad(c context.Context, request *mq_pb.CheckBrokerLoadRequest) (*mq_pb.CheckBrokerLoadResponse, error) {
ret := &mq_pb.CheckBrokerLoadResponse{}
// TODO read broker's load
return ret, nil
}
func (broker *MessageQueueBroker) AssignSegmentBrokers(c context.Context, request *mq_pb.AssignSegmentBrokersRequest) (*mq_pb.AssignSegmentBrokersResponse, error) {
ret := &mq_pb.AssignSegmentBrokersResponse{}
segment := mq.FromPbSegment(request.Segment)
// check existing segment locations on filer
existingBrokers, err := broker.checkSegmentOnFiler(segment)
if err != nil {
return ret, err
}
if len(existingBrokers) > 0 {
// good if the segment is still on the brokers
isActive, err := broker.checkSegmentsOnBrokers(segment, existingBrokers)
if err != nil {
return ret, err
}
if isActive {
for _, broker := range existingBrokers {
ret.Brokers = append(ret.Brokers, string(broker))
}
return ret, nil
}
}
// randomly pick up to 10 brokers, and find the ones with the lightest load
selectedBrokers, err := broker.selectBrokers()
if err != nil {
return ret, err
}
// save the allocated brokers info for this segment on the filer
if err := broker.saveSegmentBrokersOnFiler(segment, selectedBrokers); err != nil {
return ret, err
}
for _, broker := range selectedBrokers {
ret.Brokers = append(ret.Brokers, string(broker))
}
return ret, nil
}
func (broker *MessageQueueBroker) checkSegmentsOnBrokers(segment *mq.Segment, brokers []pb.ServerAddress) (active bool, err error) {
var wg sync.WaitGroup
for _, candidate := range brokers {
wg.Add(1)
go func(candidate pb.ServerAddress) {
defer wg.Done()
broker.withBrokerClient(false, candidate, func(client mq_pb.SeaweedMessagingClient) error {
resp, checkErr := client.CheckSegmentStatus(context.Background(), &mq_pb.CheckSegmentStatusRequest{
Segment: &mq_pb.Segment{
Namespace: string(segment.Topic.Namespace),
Topic: segment.Topic.Name,
Id: segment.Id,
},
})
if checkErr != nil {
err = checkErr
glog.V(0).Infof("check segment status on %s: %v", candidate, checkErr)
return nil
}
if resp.IsActive == false {
active = false
}
return nil
})
}(candidate)
}
wg.Wait()
return
}
func (broker *MessageQueueBroker) selectBrokers() (brokers []pb.ServerAddress, err error) {
candidates, err := broker.selectCandidatesFromMaster(10)
if err != nil {
return
}
brokers, err = broker.pickLightestCandidates(candidates, 3)
return
}
func (broker *MessageQueueBroker) selectCandidatesFromMaster(limit int32) (candidates []pb.ServerAddress, err error) {
err = broker.withMasterClient(false, broker.MasterClient.GetMaster(), func(client master_pb.SeaweedClient) error {
resp, err := client.ListClusterNodes(context.Background(), &master_pb.ListClusterNodesRequest{
ClientType: cluster.BrokerType,
FilerGroup: broker.option.FilerGroup,
Limit: limit,
})
if err != nil {
return err
}
if len(resp.ClusterNodes) == 0 {
return nil
}
for _, node := range resp.ClusterNodes {
candidates = append(candidates, pb.ServerAddress(node.Address))
}
return nil
})
return
}
type CandidateStatus struct {
address pb.ServerAddress
messageCount int64
bytesCount int64
load int64
}
func (broker *MessageQueueBroker) pickLightestCandidates(candidates []pb.ServerAddress, limit int) (selected []pb.ServerAddress, err error) {
if len(candidates) <= limit {
return candidates, nil
}
candidateStatuses, err := broker.checkBrokerStatus(candidates)
if err != nil {
return nil, err
}
sort.Slice(candidateStatuses, func(i, j int) bool {
return candidateStatuses[i].load < candidateStatuses[j].load
})
for i, candidate := range candidateStatuses {
if i >= limit {
break
}
selected = append(selected, candidate.address)
}
return
}
func (broker *MessageQueueBroker) checkBrokerStatus(candidates []pb.ServerAddress) (candidateStatuses []*CandidateStatus, err error) {
candidateStatuses = make([]*CandidateStatus, len(candidates))
var wg sync.WaitGroup
for i, candidate := range candidates {
wg.Add(1)
go func(i int, candidate pb.ServerAddress) {
defer wg.Done()
err = broker.withBrokerClient(false, candidate, func(client mq_pb.SeaweedMessagingClient) error {
resp, checkErr := client.CheckBrokerLoad(context.Background(), &mq_pb.CheckBrokerLoadRequest{})
if checkErr != nil {
err = checkErr
return err
}
candidateStatuses[i] = &CandidateStatus{
address: candidate,
messageCount: resp.MessageCount,
bytesCount: resp.BytesCount,
load: resp.MessageCount + resp.BytesCount/(64*1024),
}
return nil
})
}(i, candidate)
}
wg.Wait()
return
}
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