private fun newJournalWriter(): BufferedSink {
    val fileSink = fileSystem.appendingSink(journalFile)
    val faultHidingSink =
      FaultHidingSink(fileSink) {
        assertLockHeld()
        hasJournalErrors = true
      }
    return faultHidingSink.buffer()
  }

  @Throws(IOException::class)
  private fun readJournalLine(line: String) {
    val firstSpace = line.indexOf(' ')