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[exporterhelper] Add default batching for OTLP data type
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Make the exporter batching capability to be available for the regular exporter helper without using custom requests.
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dmitryax committed Mar 12, 2024
1 parent ef9caab commit 064c93c
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Showing 12 changed files with 1,053 additions and 20 deletions.
5 changes: 4 additions & 1 deletion .chloggen/batch-exporter-helper.yaml
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Expand Up @@ -15,7 +15,10 @@ issues: [8122]
# (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:
subtext: |
`WithBatcher` can be used with both regular exporter helper (e.g. NewTracesExporter) and the request-based exporter
helper (e.g. NewTracesRequestExporter). The request-based exporter helpers require `WithRequestBatchFuncs` option
providing batching functions.
# Optional: The change log or logs in which this entry should be included.
# e.g. '[user]' or '[user, api]'
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17 changes: 10 additions & 7 deletions exporter/exporterhelper/batch_sender.go
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Expand Up @@ -45,14 +45,17 @@ type batchSender struct {
}

// newBatchSender returns a new batch consumer component.
func newBatchSender(cfg exporterbatcher.Config, set exporter.CreateSettings) *batchSender {
func newBatchSender(cfg exporterbatcher.Config, set exporter.CreateSettings,
mf exporterbatcher.BatchMergeFunc[Request], msf exporterbatcher.BatchMergeSplitFunc[Request]) *batchSender {
bs := &batchSender{
activeBatch: newEmptyBatch(),
cfg: cfg,
logger: set.Logger,
shutdownCh: make(chan struct{}),
stopped: &atomic.Bool{},
resetTimerCh: make(chan struct{}),
activeBatch: newEmptyBatch(),
cfg: cfg,
logger: set.Logger,
mergeFunc: mf,
mergeSplitFunc: msf,
shutdownCh: make(chan struct{}),
stopped: &atomic.Bool{},
resetTimerCh: make(chan struct{}),
}
return bs
}
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42 changes: 33 additions & 9 deletions exporter/exporterhelper/common.go
Original file line number Diff line number Diff line change
Expand Up @@ -148,27 +148,35 @@ func WithCapabilities(capabilities consumer.Capabilities) Option {
}

// BatcherOption apply changes to batcher sender.
type BatcherOption func(*batchSender)
type BatcherOption func(*batchSender) error

// WithRequestBatchFuncs sets the functions for merging and splitting batches for an exporter built for custom request types.
func WithRequestBatchFuncs(mf exporterbatcher.BatchMergeFunc[Request], msf exporterbatcher.BatchMergeSplitFunc[Request]) BatcherOption {
return func(bs *batchSender) {
return func(bs *batchSender) error {
if mf == nil || msf == nil {
return fmt.Errorf("WithRequestBatchFuncs must be provided with non-nil functions")
}

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if bs.mergeFunc != nil || bs.mergeSplitFunc != nil {
return fmt.Errorf("WithRequestBatchFuncs can be used only once with request-based exporters")
}

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bs.mergeFunc = mf
bs.mergeSplitFunc = msf
return nil
}
}

// WithBatcher enables batching for an exporter based on custom request types.
// For now, it can be used only with the New[Traces|Metrics|Logs]RequestExporter exporter helpers and
// WithRequestBatchFuncs provided.
// TODO: Add OTLP-based batch functions applied by default so it can be used with New[Traces|Metrics|Logs]Exporter exporter helpers.
// This API is at the early stage of development and may change without backward compatibility
// until https://github.com/open-telemetry/opentelemetry-collector/issues/8122 is resolved.
func WithBatcher(cfg exporterbatcher.Config, opts ...BatcherOption) Option {
return func(o *baseExporter) error {
bs := newBatchSender(cfg, o.set)
bs := newBatchSender(cfg, o.set, o.batchMergeFunc, o.batchMergeSplitfunc)
for _, opt := range opts {
opt(bs)
if err := opt(bs); err != nil {
return err
}

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}
if bs.mergeFunc == nil || bs.mergeSplitFunc == nil {
return fmt.Errorf("WithRequestBatchFuncs must be provided for the batcher applied to the request-based exporters")
Expand Down Expand Up @@ -196,14 +204,28 @@ func withUnmarshaler(unmarshaler exporterqueue.Unmarshaler[Request]) Option {
}
}

// withBatchFuncs is used to set the functions for merging and splitting batches for OLTP-based exporters.
// It must be provided as the first option when creating a new exporter helper.
func withBatchFuncs(mf exporterbatcher.BatchMergeFunc[Request], msf exporterbatcher.BatchMergeSplitFunc[Request]) Option {
return func(o *baseExporter) error {
o.batchMergeFunc = mf
o.batchMergeSplitfunc = msf
return nil
}
}

// baseExporter contains common fields between different exporter types.
type baseExporter struct {
component.StartFunc
component.ShutdownFunc

signal component.DataType

batchMergeFunc exporterbatcher.BatchMergeFunc[Request]
batchMergeSplitfunc exporterbatcher.BatchMergeSplitFunc[Request]

marshaler exporterqueue.Marshaler[Request]
unmarshaler exporterqueue.Unmarshaler[Request]
signal component.DataType

set exporter.CreateSettings
obsrep *ObsReport
Expand Down Expand Up @@ -251,11 +273,13 @@ func newBaseExporter(set exporter.CreateSettings, signal component.DataType, osf

be.connectSenders()

// If queue sender is enabled assign to the batch sender the same number of workers.
if qs, ok := be.queueSender.(*queueSender); ok {
if bs, ok := be.batchSender.(*batchSender); ok {
if bs, ok := be.batchSender.(*batchSender); ok {
// If queue sender is enabled assign to the batch sender the same number of workers.
if qs, ok := be.queueSender.(*queueSender); ok {
bs.concurrencyLimit = uint64(qs.numConsumers)
}
// Batcher sender mutates the data.
be.consumerOptions = append(be.consumerOptions, consumer.WithCapabilities(consumer.Capabilities{MutatesData: true}))
}

return be, nil
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5 changes: 4 additions & 1 deletion exporter/exporterhelper/logs.go
Original file line number Diff line number Diff line change
Expand Up @@ -82,7 +82,10 @@ func NewLogsExporter(
if pusher == nil {
return nil, errNilPushLogsData
}
logsOpts := []Option{withMarshaler(logsRequestMarshaler), withUnmarshaler(newLogsRequestUnmarshalerFunc(pusher))}
logsOpts := []Option{
withMarshaler(logsRequestMarshaler), withUnmarshaler(newLogsRequestUnmarshalerFunc(pusher)),
withBatchFuncs(mergeLogs, mergeSplitLogs),
}
return NewLogsRequestExporter(ctx, set, requestFromLogs(pusher), append(logsOpts, options...)...)
}

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136 changes: 136 additions & 0 deletions exporter/exporterhelper/logs_batch.go
Original file line number Diff line number Diff line change
@@ -0,0 +1,136 @@
// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0

package exporterhelper // import "go.opentelemetry.io/collector/exporter/exporterhelper"

import (
"context"
"errors"

"go.opentelemetry.io/collector/exporter/exporterbatcher"
"go.opentelemetry.io/collector/pdata/plog"
)

// mergeLogs merges two logs requests into one.
func mergeLogs(_ context.Context, r1 Request, r2 Request) (Request, error) {
lr1, ok1 := r1.(*logsRequest)
lr2, ok2 := r2.(*logsRequest)
if !ok1 || !ok2 {
return nil, errors.New("invalid input type")
}
lr2.ld.ResourceLogs().MoveAndAppendTo(lr1.ld.ResourceLogs())
return lr1, nil
}

// mergeSplitLogs splits and/or merges the logs into multiple requests based on the MaxSizeConfig.
func mergeSplitLogs(_ context.Context, cfg exporterbatcher.MaxSizeConfig, r1 Request, r2 Request) ([]Request, error) {
var (
res []Request
destReq *logsRequest
capacityLeft = cfg.MaxSizeItems
)
for _, req := range []Request{r1, r2} {
if req == nil {
continue
}
srcReq, ok := req.(*logsRequest)
if !ok {
return nil, errors.New("invalid input type")
}
if srcReq.ld.LogRecordCount() <= capacityLeft {
if destReq == nil {
destReq = srcReq
} else {
srcReq.ld.ResourceLogs().MoveAndAppendTo(destReq.ld.ResourceLogs())
}
capacityLeft = cfg.MaxSizeItems - destReq.ld.LogRecordCount()
continue
}

for {
extractedLogs := extractLogs(srcReq.ld, capacityLeft)
if extractedLogs.LogRecordCount() == 0 {
break
}
capacityLeft -= extractedLogs.LogRecordCount()
if destReq == nil {
destReq = &logsRequest{ld: extractedLogs, pusher: srcReq.pusher}
} else {
extractedLogs.ResourceLogs().MoveAndAppendTo(destReq.ld.ResourceLogs())
}
if capacityLeft <= 0 {
res = append(res, destReq)
destReq = nil
capacityLeft = cfg.MaxSizeItems
}
}
}

if destReq != nil {
res = append(res, destReq)
}
return res, nil
}

// extractLogs extracts logs from the input logs and returns a new logs with the specified number of log records.
func extractLogs(srcLogs plog.Logs, count int) plog.Logs {
destLogs := plog.NewLogs()
srcLogs.ResourceLogs().RemoveIf(func(srcRL plog.ResourceLogs) bool {
if count <= 0 {
return false
}
needToExtract := resourceLogsCount(srcRL) > count
if needToExtract {
srcRL = extractResourceLogs(srcRL, count)
}
count -= resourceLogsCount(srcRL)
srcRL.MoveTo(destLogs.ResourceLogs().AppendEmpty())
return !needToExtract
})
return destLogs
}

// extractResourceLogs extracts resource logs and returns a new resource logs with the specified number of log records.
func extractResourceLogs(srcRL plog.ResourceLogs, count int) plog.ResourceLogs {
destRL := plog.NewResourceLogs()
destRL.SetSchemaUrl(srcRL.SchemaUrl())
srcRL.Resource().CopyTo(destRL.Resource())
srcRL.ScopeLogs().RemoveIf(func(srcSL plog.ScopeLogs) bool {
if count <= 0 {
return false
}
needToExtract := srcSL.LogRecords().Len() > count
if needToExtract {
srcSL = extractScopeLogs(srcSL, count)
}
count -= srcSL.LogRecords().Len()
srcSL.MoveTo(destRL.ScopeLogs().AppendEmpty())
return !needToExtract
})
return destRL
}

// extractScopeLogs extracts scope logs and returns a new scope logs with the specified number of log records.
func extractScopeLogs(srcSL plog.ScopeLogs, count int) plog.ScopeLogs {
destSL := plog.NewScopeLogs()
destSL.SetSchemaUrl(srcSL.SchemaUrl())
srcSL.Scope().CopyTo(destSL.Scope())
srcSL.LogRecords().RemoveIf(func(srcLR plog.LogRecord) bool {
if count <= 0 {
return false
}
srcLR.MoveTo(destSL.LogRecords().AppendEmpty())
count--
return true
})
return destSL
}

// resourceLogsCount calculates the total number of log records in the plog.ResourceLogs.
func resourceLogsCount(rl plog.ResourceLogs) int {
count := 0
for k := 0; k < rl.ScopeLogs().Len(); k++ {
count += rl.ScopeLogs().At(k).LogRecords().Len()
}
return count
}
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