doneCh := make(chan error, 1)
	defer xioutil.SafeClose(doneCh)

	// Save rebalance.bin periodically.
	go func() {
		// Update rebalance.bin periodically once every 5-10s, chosen randomly
		// to avoid multiple pool leaders herding to update around the same
		// time.
		r := rand.New(rand.NewSource(time.Now().UnixNano()))
		randSleepFor := func() time.Duration {
			return 5*time.Second + time.Duration(float64(5*time.Second)*r.Float64())
		}

	return NewWriterSize(w, defaultBufSize)
}

// Size returns the size of the underlying buffer in bytes.
func (b *Writer) Size() int { return len(b.buf) }

// Reset discards any unflushed buffered data, clears any error, and
// resets b to write its output to w.
// Calling Reset on the zero value of [Writer] initializes the internal buffer
// to the default size.