Updated according to jguiton's comments

exporter/exporterhelper/internal/batch_sender_test.go

@@ -622,7 +622,7 @@ func TestBatchSenderWithTimeout(t *testing.T) {
 			assert.EqualValues(t, 12, sink.ItemsCount())
 		})
 	}
-	runTest("enable_queue_batcher", true)
+	// When queue_batcher is enabled, we don't propagate context deadline.
 	runTest("disable_queue_batcher", false)
 }
 

exporter/exporterhelper/internal/batcher/batch_context.go

@@ -4,7 +4,6 @@
 package batcher // import "go.opentelemetry.io/collector/exporter/exporterhelper/internal/batcher"
 import (
 	"context"
-	"time"
 
 	"go.opentelemetry.io/otel/trace"
 )
@@ -13,81 +12,20 @@ type traceContextKeyType int
 
 const batchSpanLinksKey traceContextKeyType = iota
 
-// batchContext links the underlying context to all incoming span contexts.
-type batchContext struct {
-	deadline    time.Time
-	deadlineOk  bool
-	deadlineCtx context.Context
-	ctx         context.Context
-}
-
-func SpanLinksFromContext(ctx context.Context) []trace.Link {
+// LinksFromContext returns a list of trace links registered in the context.
+func LinksFromContext(ctx context.Context) []trace.Link {
 	if ctx == nil {
 		return []trace.Link{}
 	}
-
-	if bctx, ok := ctx.(batchContext); ok {
-		if links, ok := bctx.Value(batchSpanLinksKey).([]trace.Link); ok {
-			return links
-		}
-	} else {
-		panic("lalal")
+	if links, ok := ctx.Value(batchSpanLinksKey).([]trace.Link); ok {
+		return links
 	}
-	return []trace.Link{}
+	return []trace.Link{trace.LinkFromContext(ctx)}
 }
 
-func newBatchContext(ctx context.Context) batchContext {
-	deadline, ok := ctx.Deadline()
-	underlyingCtx := context.WithValue(
+func contextWithMergedLinks(ctx1 context.Context, ctx2 context.Context) context.Context {
+	return context.WithValue(
 		context.Background(),
 		batchSpanLinksKey,
-		[]trace.Link{trace.LinkFromContext(ctx)})
-	return batchContext{
-		deadline:    deadline,
-		deadlineOk:  ok,
-		deadlineCtx: ctx,
-		ctx:         underlyingCtx,
-	}
-}
-
-// Merge links the span from incoming context to the span from the first context.
-func (mc batchContext) Merge(other context.Context) batchContext {
-	deadline, deadlineOk := mc.Deadline()
-	deadlineCtx := mc.deadlineCtx
-	if otherDeadline, ok := other.Deadline(); ok {
-		deadlineOk = true
-		if deadline.Before(otherDeadline) {
-			deadline = otherDeadline
-			deadlineCtx = other
-		}
-	}
-
-	links := append(SpanLinksFromContext(mc), trace.LinkFromContext(other))
-	underlyingCtx := context.WithValue(
-		mc.ctx,
-		batchSpanLinksKey,
-		links)
-	return batchContext{
-		deadline:    deadline,
-		deadlineOk:  deadlineOk,
-		deadlineCtx: deadlineCtx,
-		ctx:         underlyingCtx,
-	}
-}
-
-// Deadline returns the latest deadline of all context.
-func (mc batchContext) Deadline() (time.Time, bool) {
-	return mc.deadline, mc.deadlineOk
-}
-
-func (mc batchContext) Done() <-chan struct{} {
-	return mc.deadlineCtx.Done()
-}
-
-func (mc batchContext) Err() error {
-	return mc.deadlineCtx.Err()
-}
-
-func (mc batchContext) Value(key any) any {
-	return mc.ctx.Value(key)
+		append(LinksFromContext(ctx1), LinksFromContext(ctx2)...))
 }

exporter/exporterhelper/internal/batcher/batch_context_test.go

@@ -6,47 +6,13 @@ package batcher
 import (
 	"context"
 	"testing"
-	"time"
 
 	"github.com/stretchr/testify/require"
+	"go.opentelemetry.io/otel/trace"
 
 	"go.opentelemetry.io/collector/component/componenttest"
-	"go.opentelemetry.io/otel/trace"
 )
 
-func TestBatchContextDeadline(t *testing.T) {
-	now := time.Now()
-	ctx1 := context.Background()
-	batchContext := newBatchContext(ctx1)
-
-	var ok bool
-	deadline, ok := batchContext.Deadline()
-	require.Equal(t, time.Time{}, deadline)
-	require.False(t, ok)
-
-	ctx2, cancel2 := context.WithDeadline(context.Background(), now.Add(200))
-	defer cancel2()
-	batchContext = batchContext.Merge(ctx2)
-
-	deadline, ok = batchContext.Deadline()
-	require.True(t, ok)
-	require.Equal(t, now.Add(200), deadline)
-
-	ctx3, cancel3 := context.WithDeadline(context.Background(), now.Add(300))
-	defer cancel3()
-	ctx4, cancel4 := context.WithDeadline(context.Background(), now.Add(100))
-	defer cancel4()
-	batchContext = batchContext.Merge(ctx3)
-	batchContext = batchContext.Merge(ctx4)
-
-	deadline, ok = batchContext.Deadline()
-	require.True(t, ok)
-	require.Equal(t, now.Add(300), deadline)
-
-	time.Sleep(300)
-	require.Equal(t, ctx3.Err(), batchContext.Err())
-}
-
 func TestBatchContextLink(t *testing.T) {
 	tracerProvider := componenttest.NewTelemetry().NewTelemetrySettings().TracerProvider
 	tracer := tracerProvider.Tracer("go.opentelemetry.io/collector/exporter/exporterhelper")
@@ -55,19 +21,17 @@ func TestBatchContextLink(t *testing.T) {
 
 	ctx2, span2 := tracer.Start(ctx1, "span2")
 	defer span2.End()
-	batchContext := newBatchContext(ctx2)
 
 	ctx3, span3 := tracer.Start(ctx1, "span3")
 	defer span3.End()
-	batchContext = batchContext.Merge(ctx3)
 
 	ctx4, span4 := tracer.Start(ctx1, "span4")
 	defer span4.End()
-	batchContext = batchContext.Merge(ctx4)
 
-	span2.AddEvent("This is an event.")
+	batchContext := contextWithMergedLinks(ctx2, ctx3)
+	batchContext = contextWithMergedLinks(batchContext, ctx4)
 
-	actualLinks := SpanLinksFromContext(batchContext)
+	actualLinks := LinksFromContext(batchContext)
 	require.Len(t, actualLinks, 3)
 	require.Equal(t, trace.SpanContextFromContext(ctx2), actualLinks[0].SpanContext)
 	require.Equal(t, trace.SpanContextFromContext(ctx3), actualLinks[1].SpanContext)

exporter/exporterhelper/internal/batcher/default_batcher.go

@@ -17,7 +17,7 @@ import (
 )
 
 type batch struct {
-	ctx  batchContext
+	ctx  context.Context
 	req  request.Request
 	done multiDone
 }
@@ -86,7 +86,7 @@ func (qb *defaultBatcher) Consume(ctx context.Context, req request.Request, done
 			// Do not flush the last item and add it to the current batch.
 			reqList = reqList[:len(reqList)-1]
 			qb.currentBatch = &batch{
-				ctx:  newBatchContext(ctx),
+				ctx:  ctx,
 				req:  lastReq,
 				done: multiDone{done},
 			}
@@ -122,7 +122,7 @@ func (qb *defaultBatcher) Consume(ctx context.Context, req request.Request, done
 	// Logic on how to deal with the current batch:
 	qb.currentBatch.req = reqList[0]
 	qb.currentBatch.done = append(qb.currentBatch.done, done)
-	qb.currentBatch.ctx = qb.currentBatch.ctx.Merge(ctx)
+	qb.currentBatch.ctx = contextWithMergedLinks(qb.currentBatch.ctx, ctx)
 
 	// Save the "currentBatch" if we need to flush it, because we want to execute flush without holding the lock, and
 	// cannot unlock and re-lock because we are not done processing all the responses.
@@ -142,7 +142,7 @@ func (qb *defaultBatcher) Consume(ctx context.Context, req request.Request, done
 			// Do not flush the last item and add it to the current batch.
 			reqList = reqList[:len(reqList)-1]
 			qb.currentBatch = &batch{
-				ctx:  newBatchContext(ctx),
+				ctx:  ctx,
 				req:  lastReq,
 				done: multiDone{done},
 			}

exporter/exporterhelper/internal/obs_report_sender.go

@@ -96,10 +96,10 @@ func (ors *obsReportSender[K]) Send(ctx context.Context, req K) error {
 // StartOp creates the span used to trace the operation. Returning
 // the updated context and the created span.
 func (ors *obsReportSender[K]) startOp(ctx context.Context) context.Context {
-	spanLinks := batcher.SpanLinksFromContext(ctx)
-
-	// This span should contain the links to spans of all batched requests.
-	ctx, _ = ors.tracer.Start(ctx, ors.spanName, ors.spanAttrs, trace.WithLinks(spanLinks...))
+	ctx, _ = ors.tracer.Start(ctx,
+		ors.spanName,
+		ors.spanAttrs,
+		trace.WithLinks(batcher.LinksFromContext(ctx)...))
 	return ctx
 }
 

exporter/exporterhelper/internal/queue_sender.go

@@ -7,11 +7,13 @@ import (
 	"context"
 	"errors"
 
+	"go.opentelemetry.io/otel/trace"
 	"go.uber.org/zap"
 
 	"go.opentelemetry.io/collector/component"
 	"go.opentelemetry.io/collector/exporter/exporterbatcher"
 	"go.opentelemetry.io/collector/exporter/exporterhelper/internal/batcher"
+	"go.opentelemetry.io/collector/exporter/exporterhelper/internal/metadata"
 	"go.opentelemetry.io/collector/exporter/exporterhelper/internal/request"
 	"go.opentelemetry.io/collector/exporter/exporterqueue"
 	"go.opentelemetry.io/collector/featuregate"
@@ -111,7 +113,11 @@ func NewQueueSender(
 		}
 
 		q, err := newObsQueue(qSet, qf(context.Background(), qSet, qCfg, func(ctx context.Context, req request.Request, done exporterqueue.Done) {
+			// TODO: move start of span to enqueue instead to dequeue.
+			// Figure out how to preserve span context across persistent storage.
+			ctx, _ = metadata.Tracer(qSet.ExporterSettings.TelemetrySettings).Start(ctx, "exporter/enqueue")
 			done.OnDone(exportFunc(ctx, req))
+			trace.SpanFromContext(ctx).End()
 		}))
 		if err != nil {
 			return nil, err