code: public static final void setCurrentEpoch(int number)
      {
          if (tc.isDebugEnabled())
              Tr.debug(tc, "setCurrentEpoch", number);
  
          currentEpoch = number;
      }
docs: Sets the current epoch value for this server instance.
  
  Initially on a cold start the valus is 1, and this is
  incremented on each warm start after extracting the previous
  value from the transactions log. The epoch value is used to
  create unique global transaction identifiers. On each cold
  start we also create a new applId, so the applid and epoch
  will guarantee uniqueness of a server instance.
  
  @param number The new retry count.