【ETCD】【源码阅读】深入分析 applierV3backend.Apply`方法源码

最新推荐文章于 2025-11-30 22:24:08 发布

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最新推荐文章于 2025-11-30 22:24:08 发布 · 1.1k 阅读

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#etcd #restful #数据库

applierV3backend的Apply主要负责将 Raft 请求 (pb.InternalRaftRequest) 应用到 Etcd 的后端存储中。它处理各种不同类型的请求，并且根据请求的具体内容调用相应的处理逻辑。
版本【release

文章目录

一、完整源码

func (a *applierV3backend) Apply(r *pb.InternalRaftRequest, shouldApplyV3 membership.ShouldApplyV3) *applyResult {
   
   
	op := "unknown"
	ar := &applyResult{
   
   }
	defer func(start time.Time) {
   
   
		success := ar.err == nil || ar.err == mvcc.ErrCompacted
		applySec.WithLabelValues(v3Version, op, strconv.FormatBool(success)).Observe(time.Since(start).Seconds())
		warnOfExpensiveRequest(a.s.Logger(), a.s.Cfg.WarningApplyDuration, start, &pb.InternalRaftStringer{
   
   Request: r}, ar.resp, ar.err)
		if !success {
   
   
			warnOfFailedRequest(a.s.Logger(), start, &pb.InternalRaftStringer{
   
   Request: r}, ar.resp, ar.err)
		}
	}(time.Now())

	switch {
   
   
	case r.ClusterVersionSet != nil: // Implemented in 3.5.x
		op = "ClusterVersionSet"
		a.s.applyV3Internal.ClusterVersionSet(r.ClusterVersionSet, shouldApplyV3)
		return nil
	case r.ClusterMemberAttrSet != nil:
		op = "ClusterMemberAttrSet" // Implemented in 3.5.x
		a.s.applyV3Internal.ClusterMemberAttrSet(r.ClusterMemberAttrSet, shouldApplyV3)
		return nil
	case r.DowngradeInfoSet != nil:
		op = "DowngradeInfoSet" // Implemented in 3.5.x
		a.s.applyV3Internal.DowngradeInfoSet(r.DowngradeInfoSet, shouldApplyV3)
		return nil
	}

	if !shouldApplyV3 {
   
   
		return nil
	}

	// call into a.s.applyV3.F instead of a.F so upper appliers can check individual calls
	switch {
   
   
	case r.Range != nil:
		op = "Range"
		ar.resp, ar.err = a.s.applyV3.Range(context.TODO(), nil, r.Range)
	case r.Put != nil:
		op = "Put"
		ar.resp, ar.trace, ar.err = a.s.applyV3.Put(context.TODO(), nil, r.Put)
	case r.DeleteRange != nil:
		op

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