docs: SettableFuture<Boolean> writeIv2ViableReplayEntryInternal(long spHandle)
      {
          SettableFuture<Boolean> written = null;
          if (m_replayComplete) {
              written = m_cl.logIv2Fault(m_mailbox.getHSId(),
                  new HashSet<Long>(m_replicaHSIds), m_partitionId, spHandle);
          }
          return written;
      }