func checkPointBatcherStats(t *testing.T, b *tsdb.PointBatcher, batchTotal, pointTotal, sizeTotal, timeoutTotal int) {
	stats := b.Stats()

	if batchTotal != -1 && stats.BatchTotal != uint64(batchTotal) {
		t.Errorf("batch total stat is incorrect: %d", stats.BatchTotal)
	}
	if pointTotal != -1 && stats.PointTotal != uint64(pointTotal) {
		t.Errorf("point total stat is incorrect: %d", stats.PointTotal)
	}
	if sizeTotal != -1 && stats.SizeTotal != uint64(sizeTotal) {
		t.Errorf("size total stat is incorrect: %d", stats.SizeTotal)
	}
	if timeoutTotal != -1 && stats.TimeoutTotal != uint64(timeoutTotal) {
		t.Errorf("timeout total stat is incorrect: %d", stats.TimeoutTotal)
	}
}

// processBatches continually drains the given batcher and writes the batches to the database.
func (s *Service) processBatches(batcher *tsdb.PointBatcher) {
	defer s.wg.Done()
	for {
		select {
		case batch := <-batcher.Out():
			if err := s.PointsWriter.WritePoints(&cluster.WritePointsRequest{
				Database:         s.database,
				RetentionPolicy:  "",
				ConsistencyLevel: s.consistencyLevel,
				Points:           batch,
			}); err != nil {
				s.logger.Printf("failed to write point batch to database %q: %s", s.database, err)
			}
		case <-s.done:
			return
		}
	}
}

// processBatches continually drains the given batcher and writes the batches to the database.
func (s *Service) processBatches(batcher *tsdb.PointBatcher) {
	defer s.wg.Done()
	for {
		select {
		case batch := <-batcher.Out():
			if err := s.PointsWriter.WritePoints(&cluster.WritePointsRequest{
				Database:         s.database,
				RetentionPolicy:  "",
				ConsistencyLevel: s.consistencyLevel,
				Points:           batch,
			}); err == nil {
				s.statMap.Add(statBatchesTrasmitted, 1)
				s.statMap.Add(statPointsTransmitted, int64(len(batch)))
			} else {
				s.logger.Printf("failed to write point batch to database %q: %s", s.database, err)
				s.statMap.Add(statBatchesTransmitFail, 1)
			}

		case <-s.done:
			return
		}
	}
}