Fix MergeSplit issue that ignores the initial message size

.chloggen/fix-traces-split.yaml

@@ -0,0 +1,25 @@
+# Use this changelog template to create an entry for release notes.
+
+# One of 'breaking', 'deprecation', 'new_component', 'enhancement', 'bug_fix'
+change_type: bug_fix
+
+# The name of the component, or a single word describing the area of concern, (e.g. otlpreceiver)
+component: exporterhelper
+
+# A brief description of the change.  Surround your text with quotes ("") if it needs to start with a backtick (`).
+note: Fix MergeSplit issue that ignores the initial message size.
+
+# One or more tracking issues or pull requests related to the change
+issues: [12257]
+
+# (Optional) One or more lines of additional information to render under the primary note.
+# These lines will be padded with 2 spaces and then inserted directly into the document.
+# Use pipe (|) for multiline entries.
+subtext:
+
+# Optional: The change log or logs in which this entry should be included.
+# e.g. '[user]' or '[user, api]'
+# Include 'user' if the change is relevant to end users.
+# Include 'api' if there is a change to a library API.
+# Default: '[user]'
+change_logs: [user]

exporter/exporterhelper/logs_batch.go

@@ -14,73 +14,36 @@ import (
 // MergeSplit splits and/or merges the provided logs request and the current request into one or more requests
 // conforming with the MaxSizeConfig.
 func (req *logsRequest) MergeSplit(_ context.Context, cfg exporterbatcher.MaxSizeConfig, r2 Request) ([]Request, error) {
-	var req2 *logsRequest
 	if r2 != nil {
-		var ok bool
-		req2, ok = r2.(*logsRequest)
+		req2, ok := r2.(*logsRequest)
 		if !ok {
 			return nil, errors.New("invalid input type")
 		}
+		req2.mergeTo(req)
 	}
 
+	// If no limit we can simply merge the new request into the current and return.
 	if cfg.MaxSizeItems == 0 {
-		req.setCachedItemsCount(req.ItemsCount() + req2.ItemsCount())
-		req2.setCachedItemsCount(0)
-		req2.ld.ResourceLogs().MoveAndAppendTo(req.ld.ResourceLogs())
 		return []Request{req}, nil
 	}
+	return req.split(cfg)
+}
 
-	var (
-		res          []Request
-		destReq      *logsRequest
-		capacityLeft = cfg.MaxSizeItems
-	)
-	for _, srcReq := range []*logsRequest{req, req2} {
-		if srcReq == nil {
-			continue
-		}
-
-		srcCount := srcReq.ItemsCount()
-		if srcCount <= capacityLeft {
-			if destReq == nil {
-				destReq = srcReq
-			} else {
-				destReq.setCachedItemsCount(destReq.ItemsCount() + srcCount)
-				srcReq.setCachedItemsCount(0)
-				srcReq.ld.ResourceLogs().MoveAndAppendTo(destReq.ld.ResourceLogs())
-			}
-			capacityLeft -= srcCount
-			continue
-		}
-
-		for {
-			extractedLogs := extractLogs(srcReq.ld, capacityLeft)
-			extractedCount := extractedLogs.LogRecordCount()
-			if extractedCount == 0 {
-				break
-			}
-
-			if destReq == nil {
-				destReq = &logsRequest{ld: extractedLogs, pusher: srcReq.pusher, cachedItemsCount: extractedCount}
-			} else {
-				extractedLogs.ResourceLogs().MoveAndAppendTo(destReq.ld.ResourceLogs())
-				destReq.setCachedItemsCount(destReq.ItemsCount() + extractedCount)
-				srcReq.setCachedItemsCount(srcReq.ItemsCount() - extractedCount)
-			}
-
-			// Create new batch once capacity is reached.
-			capacityLeft -= extractedCount
-			if capacityLeft == 0 {
-				res = append(res, destReq)
-				destReq = nil
-				capacityLeft = cfg.MaxSizeItems
-			}
-		}
-	}
+func (req *logsRequest) mergeTo(dst *logsRequest) {
+	dst.setCachedItemsCount(dst.ItemsCount() + req.ItemsCount())
+	req.setCachedItemsCount(0)
+	req.ld.ResourceLogs().MoveAndAppendTo(dst.ld.ResourceLogs())
+}
 
-	if destReq != nil {
-		res = append(res, destReq)
+func (req *logsRequest) split(cfg exporterbatcher.MaxSizeConfig) ([]Request, error) {
+	var res []Request
+	for req.ItemsCount() > cfg.MaxSizeItems {
+		ld := extractLogs(req.ld, cfg.MaxSizeItems)
+		size := ld.LogRecordCount()
+		req.setCachedItemsCount(req.ItemsCount() - size)
+		res = append(res, &logsRequest{ld: ld, pusher: req.pusher, cachedItemsCount: size})
 	}
+	res = append(res, req)
 	return res, nil
 }
 

exporter/exporterhelper/logs_batch_test.go

@@ -153,9 +153,22 @@ func TestExtractLogs(t *testing.T) {
 	}
 }
 
-func BenchmarkSplittingBasedOnItemCountManySmallLogs(b *testing.B) {
+func TestMergeSplitManySmallLogs(t *testing.T) {
 	// All requests merge into a single batch.
 	cfg := exporterbatcher.MaxSizeConfig{MaxSizeItems: 10000}
+	merged := []Request{newLogsRequest(testdata.GenerateLogs(1), nil)}
+	for j := 0; j < 1000; j++ {
+		lr2 := newLogsRequest(testdata.GenerateLogs(10), nil)
+		res, _ := merged[len(merged)-1].MergeSplit(context.Background(), cfg, lr2)
+		merged = append(merged[0:len(merged)-1], res...)
+	}
+	assert.Len(t, merged, 2)
+}
+
+func BenchmarkSplittingBasedOnItemCountManySmallLogs(b *testing.B) {
+	// All requests merge into a single batch.
+	cfg := exporterbatcher.MaxSizeConfig{MaxSizeItems: 10010}
+	b.ReportAllocs()
 	for i := 0; i < b.N; i++ {
 		merged := []Request{newLogsRequest(testdata.GenerateLogs(10), nil)}
 		for j := 0; j < 1000; j++ {
@@ -170,6 +183,7 @@ func BenchmarkSplittingBasedOnItemCountManySmallLogs(b *testing.B) {
 func BenchmarkSplittingBasedOnItemCountManyLogsSlightlyAboveLimit(b *testing.B) {
 	// Every incoming request results in a split.
 	cfg := exporterbatcher.MaxSizeConfig{MaxSizeItems: 10000}
+	b.ReportAllocs()
 	for i := 0; i < b.N; i++ {
 		merged := []Request{newLogsRequest(testdata.GenerateLogs(0), nil)}
 		for j := 0; j < 10; j++ {
@@ -184,6 +198,7 @@ func BenchmarkSplittingBasedOnItemCountManyLogsSlightlyAboveLimit(b *testing.B)
 func BenchmarkSplittingBasedOnItemCountHugeLogs(b *testing.B) {
 	// One request splits into many batches.
 	cfg := exporterbatcher.MaxSizeConfig{MaxSizeItems: 10000}
+	b.ReportAllocs()
 	for i := 0; i < b.N; i++ {
 		merged := []Request{newLogsRequest(testdata.GenerateLogs(0), nil)}
 		lr2 := newLogsRequest(testdata.GenerateLogs(100000), nil)

exporter/exporterhelper/metrics_batch.go

@@ -14,74 +14,36 @@ import (
 // MergeSplit splits and/or merges the provided metrics request and the current request into one or more requests
 // conforming with the MaxSizeConfig.
 func (req *metricsRequest) MergeSplit(_ context.Context, cfg exporterbatcher.MaxSizeConfig, r2 Request) ([]Request, error) {
-	var req2 *metricsRequest
 	if r2 != nil {
-		var ok bool
-		req2, ok = r2.(*metricsRequest)
+		req2, ok := r2.(*metricsRequest)
 		if !ok {
 			return nil, errors.New("invalid input type")
 		}
+		req2.mergeTo(req)
 	}
 
+	// If no limit we can simply merge the new request into the current and return.
 	if cfg.MaxSizeItems == 0 {
-		req.setCachedItemsCount(req.ItemsCount() + req2.ItemsCount())
-		req2.setCachedItemsCount(0)
-		req2.md.ResourceMetrics().MoveAndAppendTo(req.md.ResourceMetrics())
 		return []Request{req}, nil
 	}
+	return req.split(cfg)
+}
 
-	var (
-		res          []Request
-		destReq      *metricsRequest
-		capacityLeft = cfg.MaxSizeItems
-	)
-	for _, srcReq := range []*metricsRequest{req, req2} {
-		if srcReq == nil {
-			continue
-		}
-
-		srcCount := srcReq.ItemsCount()
-		if srcCount <= capacityLeft {
-			if destReq == nil {
-				destReq = srcReq
-			} else {
-				destReq.setCachedItemsCount(destReq.ItemsCount() + srcCount)
-				srcReq.setCachedItemsCount(0)
-				srcReq.md.ResourceMetrics().MoveAndAppendTo(destReq.md.ResourceMetrics())
-			}
-			capacityLeft -= srcCount
-			continue
-		}
-
-		for {
-			extractedMetrics := extractMetrics(srcReq.md, capacityLeft)
-			extractedCount := extractedMetrics.DataPointCount()
-			if extractedCount == 0 {
-				break
-			}
-
-			if destReq == nil {
-				destReq = &metricsRequest{md: extractedMetrics, pusher: srcReq.pusher, cachedItemsCount: extractedCount}
-			} else {
-				destReq.setCachedItemsCount(destReq.ItemsCount() + extractedCount)
-				srcReq.setCachedItemsCount(srcReq.ItemsCount() - extractedCount)
-				extractedMetrics.ResourceMetrics().MoveAndAppendTo(destReq.md.ResourceMetrics())
-			}
-
-			// Create new batch once capacity is reached.
-			capacityLeft -= extractedCount
-			if capacityLeft == 0 {
-				res = append(res, destReq)
-				destReq = nil
-				capacityLeft = cfg.MaxSizeItems
-			}
-		}
-	}
+func (req *metricsRequest) mergeTo(dst *metricsRequest) {
+	dst.setCachedItemsCount(dst.ItemsCount() + req.ItemsCount())
+	req.setCachedItemsCount(0)
+	req.md.ResourceMetrics().MoveAndAppendTo(dst.md.ResourceMetrics())
+}
 
-	if destReq != nil {
-		res = append(res, destReq)
+func (req *metricsRequest) split(cfg exporterbatcher.MaxSizeConfig) ([]Request, error) {
+	var res []Request
+	for req.ItemsCount() > cfg.MaxSizeItems {
+		md := extractMetrics(req.md, cfg.MaxSizeItems)
+		size := md.DataPointCount()
+		req.setCachedItemsCount(req.ItemsCount() - size)
+		res = append(res, &metricsRequest{md: md, pusher: req.pusher, cachedItemsCount: size})
 	}
-
+	res = append(res, req)
 	return res, nil
 }
 

exporter/exporterhelper/metrics_batch_test.go

@@ -161,9 +161,22 @@ func TestExtractMetricsInvalidMetric(t *testing.T) {
 	assert.Equal(t, 0, md.ResourceMetrics().Len())
 }
 
-func BenchmarkSplittingBasedOnItemCountManySmallMetrics(b *testing.B) {
+func TestMergeSplitManySmallMetrics(t *testing.T) {
 	// All requests merge into a single batch.
 	cfg := exporterbatcher.MaxSizeConfig{MaxSizeItems: 20000}
+	merged := []Request{newMetricsRequest(testdata.GenerateMetrics(1), nil)}
+	for j := 0; j < 1000; j++ {
+		lr2 := newMetricsRequest(testdata.GenerateMetrics(10), nil)
+		res, _ := merged[len(merged)-1].MergeSplit(context.Background(), cfg, lr2)
+		merged = append(merged[0:len(merged)-1], res...)
+	}
+	assert.Len(t, merged, 2)
+}
+
+func BenchmarkSplittingBasedOnItemCountManySmallMetrics(b *testing.B) {
+	// All requests merge into a single batch.
+	cfg := exporterbatcher.MaxSizeConfig{MaxSizeItems: 20020}
+	b.ReportAllocs()
 	for i := 0; i < b.N; i++ {
 		merged := []Request{newMetricsRequest(testdata.GenerateMetrics(10), nil)}
 		for j := 0; j < 1000; j++ {
@@ -178,6 +191,7 @@ func BenchmarkSplittingBasedOnItemCountManySmallMetrics(b *testing.B) {
 func BenchmarkSplittingBasedOnItemCountManyMetricsSlightlyAboveLimit(b *testing.B) {
 	// Every incoming request results in a split.
 	cfg := exporterbatcher.MaxSizeConfig{MaxSizeItems: 20000}
+	b.ReportAllocs()
 	for i := 0; i < b.N; i++ {
 		merged := []Request{newMetricsRequest(testdata.GenerateMetrics(0), nil)}
 		for j := 0; j < 10; j++ {
@@ -192,6 +206,7 @@ func BenchmarkSplittingBasedOnItemCountManyMetricsSlightlyAboveLimit(b *testing.
 func BenchmarkSplittingBasedOnItemCountHugeMetrics(b *testing.B) {
 	// One request splits into many batches.
 	cfg := exporterbatcher.MaxSizeConfig{MaxSizeItems: 20000}
+	b.ReportAllocs()
 	for i := 0; i < b.N; i++ {
 		merged := []Request{newMetricsRequest(testdata.GenerateMetrics(0), nil)}
 		lr2 := newMetricsRequest(testdata.GenerateMetrics(100000), nil)

exporter/exporterhelper/traces_batch.go

@@ -14,73 +14,36 @@ import (
 // MergeSplit splits and/or merges the provided traces request and the current request into one or more requests
 // conforming with the MaxSizeConfig.
 func (req *tracesRequest) MergeSplit(_ context.Context, cfg exporterbatcher.MaxSizeConfig, r2 Request) ([]Request, error) {
-	var req2 *tracesRequest
 	if r2 != nil {
-		var ok bool
-		req2, ok = r2.(*tracesRequest)
+		req2, ok := r2.(*tracesRequest)
 		if !ok {
 			return nil, errors.New("invalid input type")
 		}
+		req2.mergeTo(req)
 	}
 
+	// If no limit we can simply merge the new request into the current and return.
 	if cfg.MaxSizeItems == 0 {
-		req.setCachedItemsCount(req.ItemsCount() + req2.ItemsCount())
-		req2.setCachedItemsCount(0)
-		req2.td.ResourceSpans().MoveAndAppendTo(req.td.ResourceSpans())
 		return []Request{req}, nil
 	}
+	return req.split(cfg)
+}
 
-	var (
-		res          []Request
-		destReq      *tracesRequest
-		capacityLeft = cfg.MaxSizeItems
-	)
-	for _, srcReq := range []*tracesRequest{req, req2} {
-		if srcReq == nil {
-			continue
-		}
-
-		srcCount := srcReq.ItemsCount()
-		if srcCount <= capacityLeft {
-			if destReq == nil {
-				destReq = srcReq
-			} else {
-				destReq.setCachedItemsCount(destReq.ItemsCount() + srcCount)
-				srcReq.setCachedItemsCount(0)
-				srcReq.td.ResourceSpans().MoveAndAppendTo(destReq.td.ResourceSpans())
-			}
-			capacityLeft -= srcCount
-			continue
-		}
-
-		for {
-			extractedTraces := extractTraces(srcReq.td, capacityLeft)
-			extractedCount := extractedTraces.SpanCount()
-			if extractedCount == 0 {
-				break
-			}
-
-			if destReq == nil {
-				destReq = &tracesRequest{td: extractedTraces, pusher: srcReq.pusher, cachedItemsCount: extractedCount}
-			} else {
-				destReq.setCachedItemsCount(destReq.ItemsCount() + extractedCount)
-				srcReq.setCachedItemsCount(srcReq.ItemsCount() - extractedCount)
-				extractedTraces.ResourceSpans().MoveAndAppendTo(destReq.td.ResourceSpans())
-			}
-
-			// Create new batch once capacity is reached.
-			capacityLeft -= extractedCount
-			if capacityLeft == 0 {
-				res = append(res, destReq)
-				destReq = nil
-				capacityLeft = cfg.MaxSizeItems
-			}
-		}
-	}
+func (req *tracesRequest) mergeTo(dst *tracesRequest) {
+	dst.setCachedItemsCount(dst.ItemsCount() + req.ItemsCount())
+	req.setCachedItemsCount(0)
+	req.td.ResourceSpans().MoveAndAppendTo(dst.td.ResourceSpans())
+}
 
-	if destReq != nil {
-		res = append(res, destReq)
+func (req *tracesRequest) split(cfg exporterbatcher.MaxSizeConfig) ([]Request, error) {
+	var res []Request
+	for req.ItemsCount() > cfg.MaxSizeItems {
+		td := extractTraces(req.td, cfg.MaxSizeItems)
+		size := td.SpanCount()
+		req.setCachedItemsCount(req.ItemsCount() - size)
+		res = append(res, &tracesRequest{td: td, pusher: req.pusher, cachedItemsCount: size})
 	}
+	res = append(res, req)
 	return res, nil
 }