Upsert api写s3的流程源码分析

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Upsert api写s3的流程

milvus版本:v2.3.2

实现:先insert再delete，并限制不能修改主键列。

整体架构:

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Upsert 的数据流向

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upsert写入s3的流程

upsert先insert，再delete。从proxy的execute()方法可以看出。

func (it *upsertTask) Execute(ctx context.Context) (err error) {ctx, sp := otel.Tracer(typeutil.ProxyRole).Start(ctx, "Proxy-Upsert-Execute")defer sp.End()log := log.Ctx(ctx).With(zap.String("collectionName", it.req.CollectionName))tr := timerecord.NewTimeRecorder(fmt.Sprintf("proxy execute upsert %d", it.ID()))// 拿到stream,类型为msgstream.mqMsgStreamstream, err := it.chMgr.getOrCreateDmlStream(it.collectionID)if err != nil {return err}// 创建msgPackmsgPack := &msgstream.MsgPack{BeginTs: it.BeginTs(),EndTs:   it.EndTs(),}// 添加insertMsgPackerr = it.insertExecute(ctx, msgPack)if err != nil {log.Warn("Fail to insertExecute", zap.Error(err))return err}// 添加deleteMsgPackerr = it.deleteExecute(ctx, msgPack)if err != nil {log.Warn("Fail to deleteExecute", zap.Error(err))return err}tr.RecordSpan()// 发送数据至mqerr = stream.Produce(msgPack)if err != nil {it.result.Status = merr.Status(err)return err}sendMsgDur := tr.RecordSpan()metrics.ProxySendMutationReqLatency.WithLabelValues(strconv.FormatInt(paramtable.GetNodeID(), 10), metrics.UpsertLabel).Observe(float64(sendMsgDur.Milliseconds()))totalDur := tr.ElapseSpan()log.Debug("Proxy Upsert Execute done", zap.Int64("taskID", it.ID()),zap.Duration("total duration", totalDur))return nil
}

将insertmsg和deletemsg加入msgPack，然后datanode进行消费。

insert和delete流程分别可以参考对应写入s3的流程。产生insertlog和deletelog。

// Operate handles input messages, implementing flowgrpah.Node
func (ddn *ddNode) Operate(in []Msg) []Msg {......// 遍历msMsgfor _, msg := range msMsg.TsMessages() {switch msg.Type() {case commonpb.MsgType_DropCollection:......case commonpb.MsgType_DropPartition:......// 处理insert消息case commonpb.MsgType_Insert:......// 处理delete消息case commonpb.MsgType_Delete:......}}......
}

s3文件

upsert结合了insert和delete操作。因此在s3对应的文件也即insert和delete对应的文件。

主要涉及delta_log和stats_log。

insert:

files/insert_log/{collectionID}/{partitionID}/{segmentID}/{fieldID}/{logidx}
files/stats_log/{collectionID}/{partitionID}/{segmentID}/{fieldID}/1(flushed)
files/stats_log/{collectionID}/{partitionID}/{segmentID}/{fieldID}/{logidx}(not flushed)

delete:

files/delta_log/{collID}/{partID}/{segmentID}/{logID}
files/stats_log/{collID}/{partID}/{segmentID}/{fieldID}/1(flushed)
files/stats_log/{collID}/{partID}/{segmentID}/{fieldID}/{logID}(not flushed)