code: protected int incSyncTimeout() {
      int syncTimeoutMs = getSyncTimeoutMs();
      participantState.setSyncTimeoutMs(syncTimeoutMs * 2);
      LOG.debug("Increase the sync timeout to {}", getSyncTimeoutMs());
      return syncTimeoutMs;
    }
docs: Doubles the synchronizing timeout.
  
  @return the old synchronizing timeout in milliseconds.