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Implement data sync between datanodes (#8)
* Implement hash ring in load balancer * Replicate messages in datanode's replica * Add more error logs * Add datanode partition count to leader configs * Add data sync rpcs to datanode client * Impelement datanode data syncer * Increase max workers of threadpool * Fix env vars of leader * Remove datanode from hash circle after failing
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,116 @@ | ||
| package tasks | ||
|
|
||
| import ( | ||
| "context" | ||
| "fmt" | ||
| "os" | ||
| "time" | ||
|
|
||
| "github.com/sirupsen/logrus" | ||
|
|
||
| "github.com/kysre/TurtleMQ/leader/internal/app/loadbalancer" | ||
| "github.com/kysre/TurtleMQ/leader/internal/clients" | ||
| "github.com/kysre/TurtleMQ/leader/internal/models" | ||
| "github.com/kysre/TurtleMQ/leader/pkg/datanode" | ||
| ) | ||
|
|
||
| type DataNodeDataSyncer struct { | ||
| logger *logrus.Logger | ||
| dataNodeDirectory *models.DataNodeDirectory | ||
| balancer loadbalancer.Balancer | ||
| partitionCount int | ||
| dataSyncTimeout int | ||
| } | ||
|
|
||
| func NewDataNodeSyncer( | ||
| logger *logrus.Logger, | ||
| dataNodeDirectory *models.DataNodeDirectory, | ||
| balancer loadbalancer.Balancer, | ||
| partitionCount int, | ||
| dataSyncTimeout int, | ||
| ) *DataNodeDataSyncer { | ||
| return &DataNodeDataSyncer{ | ||
| logger: logger, | ||
| dataNodeDirectory: dataNodeDirectory, | ||
| balancer: balancer, | ||
| partitionCount: partitionCount, | ||
| dataSyncTimeout: dataSyncTimeout, | ||
| } | ||
| } | ||
|
|
||
| // Data of datanode[i] is replicated in datanode[i+1] | ||
| // After datanode[i] fails: | ||
| // - Remove datanode[i] from load balancer | ||
| // - Replica data of datanode[i+1] should be read -> push to datanode[i+1] data | ||
| // - Replica data of datanode[i+1] should be purged | ||
| // - Data of datanode[i-1] should be read -> write to datanode[i+1] replica data | ||
|
|
||
| func (s *DataNodeDataSyncer) SyncData(failedDataNode *models.DataNode) { | ||
| s.logger.Info(fmt.Sprintf("Start datasync for datanode[%d]", failedDataNode.ID)) | ||
| // Create context for requests | ||
| ctx, cancel := context.WithTimeout(context.Background(), time.Duration(s.dataSyncTimeout)*time.Second) | ||
| defer cancel() | ||
| // Get dataNodes that are present in data sync | ||
| prevDataNode, afterDataNode, err := s.balancer.GetPreviousAndAfterDataNodesForSync(failedDataNode.Address) | ||
| if err != nil { | ||
| s.logger.Error(err) | ||
| } | ||
| // Halt push & pull to dataNodes that are present in data sync | ||
| s.dataNodeDirectory.UpdateDataNodeState(failedDataNode.ID, models.DataNodeStatePENDING) | ||
| s.dataNodeDirectory.UpdateDataNodeState(prevDataNode.ID, models.DataNodeStatePENDING) | ||
| s.dataNodeDirectory.UpdateDataNodeState(afterDataNode.ID, models.DataNodeStatePENDING) | ||
| // Step 1 | ||
| err = s.balancer.RemoveDataNodeFromHashCircle(failedDataNode.Address) | ||
| if err != nil { | ||
| logrus.Error(err) | ||
| os.Exit(-1) | ||
| } | ||
| // Step 2 | ||
| for i := 0; i < s.partitionCount; i++ { | ||
| res, err := afterDataNode.Client.ReadPartition( | ||
| ctx, &datanode.ReadPartitionRequest{PartitionIndex: int32(i), IsReplica: true}) | ||
| if err != nil { | ||
| s.logger.Error(err) | ||
| continue | ||
| } | ||
| go s.pushMessagesToDataNode(ctx, afterDataNode.Client, res.PartitionMessages) | ||
| } | ||
| // Step 3 | ||
| err = afterDataNode.Client.PurgeReplicaData(ctx) | ||
| if err != nil { | ||
| s.logger.Error(err) | ||
| } | ||
| // Step 4 | ||
| for i := 0; i < s.partitionCount; i++ { | ||
| res, err := prevDataNode.Client.ReadPartition( | ||
| ctx, &datanode.ReadPartitionRequest{PartitionIndex: int32(i), IsReplica: false}) | ||
| if err != nil { | ||
| s.logger.Error(err) | ||
| continue | ||
| } | ||
| req := datanode.WritePartitionRequest{PartitionIndex: int32(i), IsReplica: true} | ||
| req.PartitionMessages = append(req.PartitionMessages, res.PartitionMessages...) | ||
| err = afterDataNode.Client.WritePartition(ctx, &req) | ||
| if err != nil { | ||
| s.logger.Error(err) | ||
| } | ||
| } | ||
| // Resume push & pull to dataNodes that are present in data sync | ||
| s.dataNodeDirectory.UpdateDataNodeState(failedDataNode.ID, models.DataNodeStateUNHEALTHY) | ||
| s.dataNodeDirectory.UpdateDataNodeState(prevDataNode.ID, models.DataNodeStateAVAILABLE) | ||
| s.dataNodeDirectory.UpdateDataNodeState(afterDataNode.ID, models.DataNodeStateAVAILABLE) | ||
| s.logger.Info(fmt.Sprintf("Done datasync for datanode[%d]", failedDataNode.ID)) | ||
| } | ||
|
|
||
| func (s *DataNodeDataSyncer) pushMessagesToDataNode( | ||
| ctx context.Context, client clients.DataNodeClient, messages []*datanode.QueueMessage) { | ||
| for _, message := range messages { | ||
| req := datanode.PushRequest{IsReplica: false, Message: message} | ||
| reqCtx, cancel := context.WithTimeout(ctx, time.Duration(3)*time.Second) | ||
| _, err := client.Push(reqCtx, &req) | ||
| if err != nil { | ||
| s.logger.Error(err) | ||
| } | ||
| cancel() | ||
| } | ||
| } |
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