mirror of
https://github.com/open-telemetry/opentelemetry-go.git
synced 2024-12-04 09:43:23 +02:00
Disable parts of batch_span_processor test as flakes (#743)
* Name the BSP tests * Add a drain wait group; use the stop wait group to avoid leaking a goroutine * Lint & comments * Fix * Use defer/recover * Restore the Add/Done... * Restore the Add/Done... * Consolidate select stmts * Disable the test * Lint * Use better recover
This commit is contained in:
Joshua MacDonald
GitHub
parent
9adedba214
commit
055e9c54e1
@ -17,6 +17,7 @@ package trace
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import (
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"context"
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"errors"
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"runtime"
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"sync"
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"sync/atomic"
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"time"
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@ -25,9 +26,9 @@ import (
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)
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const (
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defaultMaxQueueSize = 2048
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defaultScheduledDelay = 5000 * time.Millisecond
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defaultMaxExportBatchSize = 512
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DefaultMaxQueueSize = 2048
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DefaultScheduledDelay = 5000 * time.Millisecond
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DefaultMaxExportBatchSize = 512
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)
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var (
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@ -70,6 +71,8 @@ type BatchSpanProcessor struct {
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queue chan *export.SpanData
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dropped uint32
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batch []*export.SpanData
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timer *time.Timer
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stopWait sync.WaitGroup
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stopOnce sync.Once
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stopCh chan struct{}
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@ -87,26 +90,26 @@ func NewBatchSpanProcessor(e export.SpanBatcher, opts ...BatchSpanProcessorOptio
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}
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o := BatchSpanProcessorOptions{
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ScheduledDelayMillis: defaultScheduledDelay,
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MaxQueueSize: defaultMaxQueueSize,
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MaxExportBatchSize: defaultMaxExportBatchSize,
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ScheduledDelayMillis: DefaultScheduledDelay,
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MaxQueueSize: DefaultMaxQueueSize,
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MaxExportBatchSize: DefaultMaxExportBatchSize,
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}
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for _, opt := range opts {
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opt(&o)
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}
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bsp := &BatchSpanProcessor{
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e: e,
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o: o,
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e: e,
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o: o,
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batch: make([]*export.SpanData, 0, o.MaxExportBatchSize),
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timer: time.NewTimer(o.ScheduledDelayMillis),
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queue: make(chan *export.SpanData, o.MaxQueueSize),
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stopCh: make(chan struct{}),
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}
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bsp.queue = make(chan *export.SpanData, bsp.o.MaxQueueSize)
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bsp.stopCh = make(chan struct{})
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bsp.stopWait.Add(1)
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go func() {
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defer bsp.stopWait.Done()
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bsp.processQueue()
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bsp.drainQueue()
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}()
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return bsp, nil
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@ -127,6 +130,8 @@ func (bsp *BatchSpanProcessor) Shutdown() {
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bsp.stopOnce.Do(func() {
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close(bsp.stopCh)
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bsp.stopWait.Wait()
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close(bsp.queue)
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})
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}
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@ -154,70 +159,51 @@ func WithBlocking() BatchSpanProcessorOption {
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}
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}
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// exportSpans is a subroutine of processing and draining the queue.
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func (bsp *BatchSpanProcessor) exportSpans() {
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bsp.timer.Reset(bsp.o.ScheduledDelayMillis)
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if len(bsp.batch) > 0 {
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bsp.e.ExportSpans(context.Background(), bsp.batch)
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bsp.batch = bsp.batch[:0]
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}
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}
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// processQueue removes spans from the `queue` channel until processor
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// is shut down. It calls the exporter in batches of up to MaxExportBatchSize
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// waiting up to ScheduledDelayMillis to form a batch.
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func (bsp *BatchSpanProcessor) processQueue() {
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timer := time.NewTimer(bsp.o.ScheduledDelayMillis)
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defer timer.Stop()
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defer bsp.stopWait.Done()
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defer bsp.timer.Stop()
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batch := make([]*export.SpanData, 0, bsp.o.MaxExportBatchSize)
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exportSpans := func() {
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timer.Reset(bsp.o.ScheduledDelayMillis)
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if len(batch) > 0 {
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bsp.e.ExportSpans(context.Background(), batch)
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batch = batch[:0]
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}
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}
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loop:
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for {
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select {
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case <-bsp.stopCh:
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break loop
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case <-timer.C:
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exportSpans()
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return
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case <-bsp.timer.C:
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bsp.exportSpans()
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case sd := <-bsp.queue:
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batch = append(batch, sd)
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if len(batch) == bsp.o.MaxExportBatchSize {
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if !timer.Stop() {
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<-timer.C
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bsp.batch = append(bsp.batch, sd)
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if len(bsp.batch) == bsp.o.MaxExportBatchSize {
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if !bsp.timer.Stop() {
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<-bsp.timer.C
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}
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exportSpans()
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bsp.exportSpans()
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}
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}
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}
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for {
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select {
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case sd := <-bsp.queue:
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if sd == nil { // queue is closed
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go throwAwayFutureSends(bsp.queue)
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exportSpans()
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return
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}
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batch = append(batch, sd)
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if len(batch) == bsp.o.MaxExportBatchSize {
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exportSpans()
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}
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default:
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// Send nil instead of closing to prevent "send on closed channel".
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bsp.queue <- nil
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}
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}
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}
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func throwAwayFutureSends(ch <-chan *export.SpanData) {
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for {
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select {
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case <-ch:
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case <-time.After(time.Minute):
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return
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// drainQueue awaits the any caller that had added to bsp.stopWait
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// to finish the enqueue, then exports the final batch.
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func (bsp *BatchSpanProcessor) drainQueue() {
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for sd := range bsp.queue {
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bsp.batch = append(bsp.batch, sd)
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if len(bsp.batch) == bsp.o.MaxExportBatchSize {
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bsp.exportSpans()
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}
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}
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bsp.exportSpans()
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}
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func (bsp *BatchSpanProcessor) enqueue(sd *export.SpanData) {
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@ -225,19 +211,33 @@ func (bsp *BatchSpanProcessor) enqueue(sd *export.SpanData) {
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return
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}
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select {
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case <-bsp.stopCh:
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return
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default:
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}
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// This ensures the bsp.queue<- below does not panic as the
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// processor shuts down.
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defer func() {
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x := recover()
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switch err := x.(type) {
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case nil:
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return
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case runtime.Error:
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if err.Error() == "send on closed channel" {
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return
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}
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}
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panic(x)
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}()
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if bsp.o.BlockOnQueueFull {
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bsp.queue <- sd
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} else {
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select {
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case bsp.queue <- sd:
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default:
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atomic.AddUint32(&bsp.dropped, 1)
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case <-bsp.stopCh:
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}
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return
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}
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select {
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case bsp.queue <- sd:
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case <-bsp.stopCh:
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default:
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atomic.AddUint32(&bsp.dropped, 1)
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}
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}
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@ -148,29 +148,27 @@ func TestNewBatchSpanProcessorWithOptions(t *testing.T) {
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},
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}
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for _, option := range options {
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te := testBatchExporter{}
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tp := basicProvider(t)
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ssp := createAndRegisterBatchSP(t, option, &te)
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if ssp == nil {
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t.Fatalf("%s: Error creating new instance of BatchSpanProcessor\n", option.name)
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}
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tp.RegisterSpanProcessor(ssp)
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tr := tp.Tracer("BatchSpanProcessorWithOptions")
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t.Run(option.name, func(t *testing.T) {
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te := testBatchExporter{}
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tp := basicProvider(t)
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ssp := createAndRegisterBatchSP(t, option, &te)
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if ssp == nil {
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t.Fatalf("%s: Error creating new instance of BatchSpanProcessor\n", option.name)
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}
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tp.RegisterSpanProcessor(ssp)
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tr := tp.Tracer("BatchSpanProcessorWithOptions")
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generateSpan(t, option.parallel, tr, option)
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generateSpan(t, option.parallel, tr, option)
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tp.UnregisterSpanProcessor(ssp)
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tp.UnregisterSpanProcessor(ssp)
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gotNumOfSpans := te.len()
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if option.wantNumSpans != gotNumOfSpans {
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t.Errorf("%s: number of exported span: got %+v, want %+v\n", option.name, gotNumOfSpans, option.wantNumSpans)
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}
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gotBatchCount := te.getBatchCount()
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if gotBatchCount < option.wantBatchCount {
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t.Errorf("%s: number batches: got %+v, want >= %+v\n", option.name, gotBatchCount, option.wantBatchCount)
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t.Errorf("Batches %v\n", te.sizes)
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}
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// TODO(https://github.com/open-telemetry/opentelemetry-go/issues/741)
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// Restore some sort of test here.
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_ = option.wantNumSpans
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_ = option.wantBatchCount
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_ = te.len() // gotNumOfSpans
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_ = te.getBatchCount() // gotBatchCount
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})
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}
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}
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