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Exponential Backoff for ByteFIFO (#15724)
This PR is another in the vein of queue improvements. It suggests an exponential backoff for bytefifo queues to reduce the load from queue polling. This will mostly be useful for redis queues. Signed-off-by: Andrew Thornton <art27@cantab.net> Co-authored-by: Lauris BH <lauris@nix.lv>
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1 changed files with 59 additions and 29 deletions
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@ -114,43 +114,73 @@ func (q *ByteFIFOQueue) Run(atShutdown, atTerminate func(context.Context, func()
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}
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func (q *ByteFIFOQueue) readToChan() {
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// handle quick cancels
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select {
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case <-q.closed:
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// tell the pool to shutdown.
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q.cancel()
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return
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default:
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}
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backOffTime := time.Millisecond * 100
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maxBackOffTime := time.Second * 3
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for {
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select {
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case <-q.closed:
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// tell the pool to shutdown.
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q.cancel()
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return
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default:
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q.lock.Lock()
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bs, err := q.byteFIFO.Pop()
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if err != nil {
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q.lock.Unlock()
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log.Error("%s: %s Error on Pop: %v", q.typ, q.name, err)
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time.Sleep(time.Millisecond * 100)
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continue
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}
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success, resetBackoff := q.doPop()
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if resetBackoff {
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backOffTime = 100 * time.Millisecond
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}
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if len(bs) == 0 {
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q.lock.Unlock()
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time.Sleep(time.Millisecond * 100)
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continue
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if success {
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select {
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case <-q.closed:
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// tell the pool to shutdown.
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q.cancel()
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return
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default:
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}
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data, err := unmarshalAs(bs, q.exemplar)
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if err != nil {
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log.Error("%s: %s Failed to unmarshal with error: %v", q.typ, q.name, err)
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q.lock.Unlock()
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time.Sleep(time.Millisecond * 100)
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continue
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} else {
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select {
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case <-q.closed:
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// tell the pool to shutdown.
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q.cancel()
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return
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case <-time.After(backOffTime):
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}
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backOffTime += backOffTime / 2
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if backOffTime > maxBackOffTime {
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backOffTime = maxBackOffTime
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}
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log.Trace("%s %s: Task found: %#v", q.typ, q.name, data)
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q.WorkerPool.Push(data)
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q.lock.Unlock()
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}
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}
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}
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func (q *ByteFIFOQueue) doPop() (success, resetBackoff bool) {
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q.lock.Lock()
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defer q.lock.Unlock()
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bs, err := q.byteFIFO.Pop()
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if err != nil {
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log.Error("%s: %s Error on Pop: %v", q.typ, q.name, err)
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return
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}
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if len(bs) == 0 {
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return
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}
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resetBackoff = true
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data, err := unmarshalAs(bs, q.exemplar)
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if err != nil {
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log.Error("%s: %s Failed to unmarshal with error: %v", q.typ, q.name, err)
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return
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}
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log.Trace("%s %s: Task found: %#v", q.typ, q.name, data)
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q.WorkerPool.Push(data)
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success = true
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return
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}
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// Shutdown processing from this queue
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func (q *ByteFIFOQueue) Shutdown() {
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log.Trace("%s: %s Shutting down", q.typ, q.name)
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