code: protected RecoverableUnitImpl removeRecoverableUnitMapEntries(long identity)
      {
          if (tc.isEntryEnabled())
              Tr.entry(tc, "removeRecoverableUnitMapEntries", new Object[] { identity, this });
  
          final RecoverableUnitImpl recoverableUnit = (RecoverableUnitImpl) _recoverableUnits.remove(identity);
  
          if (recoverableUnit != null)
          {
              _recUnitIdTable.removeId(identity);
          }
  
          if (tc.isEntryEnabled())
              Tr.exit(tc, "removeRecoverableUnitMapEntries", recoverableUnit);
          return recoverableUnit;
      }
docs: Removes a RecoverableUnitImpl object, keyed from its identity from this
  classes collection of such objects.
  
  @param identity The identity of the RecoverableUnitImpl to be removed
  
  @return RecoverableUnitImpl The RecoverableUnitImpl thats no longer associated
  with the MultiScopeRecoveryLog.