docs: private void queueOrOfferMPTask(TransactionTask task)
      {
          // The pending map will only have an entry for the transaction if the first fragment is
          // still pending durability.
          Queue<TransactionTask> pendingTasks = m_mpsPendingDurability.get(task.getTxnId());
          if (pendingTasks != null) {
              pendingTasks.offer(task);
          } else {
              m_pendingTasks.offer(task);
          }
      }