docs: protected void updatePartnerServiceData() throws Exception {
          if (tc.isEntryEnabled())
              Tr.entry(tc, "updatePartnerServiceData");
  
          try {
              //
              // Check we have a recoverableUnit and three sections to add the data.
              // On recovery we check that all service data sections were recovered.
              //
              if (_partnerServiceData == null) {
                  if (_recoverXaLog != null)
                      _partnerServiceData = _recoverXaLog.createRecoverableUnit();
                  else
                      _partnerServiceData = _xaLog.createRecoverableUnit();
  
                  _partnerServerSection = _partnerServiceData.createSection(TransactionImpl.SERVER_DATA_SECTION, true);
                  _partnerApplIdSection = _partnerServiceData.createSection(TransactionImpl.APPLID_DATA_SECTION, true);
                  _partnerEpochSection = _partnerServiceData.createSection(TransactionImpl.EPOCH_DATA_SECTION, true);
                  _partnerLowWatermarkSection = _partnerServiceData.createSection(TransactionImpl.LOW_WATERMARK_SECTION, true); /* @MD18134A */
                  _partnerNextIdSection = _partnerServiceData.createSection(TransactionImpl.NEXT_ID_SECTION, true); /* @MD18134A */
  
                  // Log this server name
                  _partnerServerSection.addData(Utils.byteArray(_failureScopeController.serverName()));
                  // Log our ApplId
                  _partnerApplIdSection.addData(_ourApplId);
  
                  // Low watermark will start at 1
                  _partnerEntryLowWatermark = 1; /* @MD18134A */
                  _partnerLowWatermarkSection.addData(Util.intToBytes(_partnerEntryLowWatermark)); /* @MD18134A */
  
                  // Next ID will start at 2.
                  _partnerEntryNextId = 2; /* @MD18134A */
                  _partnerNextIdSection.addData(Util.intToBytes(_partnerEntryNextId)); /* @MD18134A */
              }
  
              // Always update this server's current epoch
              _partnerEpochSection.addData(Util.intToBytes(_ourEpoch));
  
              // Update the server state in the log
              updateServerState(STARTING);
  
              _partnerServiceData.forceSections();
          } catch (Exception e) {
              FFDCFilter.processException(e, "com.ibm.tx.jta.impl.RecoveryManager.updatePartnerSeviceData", "1224", this);
              if (tc.isEntryEnabled())
                  Tr.exit(tc, "updatePartnerServiceData", e);
              throw e;
          }
  
          if (tc.isEntryEnabled())
              Tr.exit(tc, "updatePartnerServiceData");
      }