@Override
  public void setRollbackMessage(DistTXRollbackMessage rollbackMsg, DistributionManager dm)
      throws UnsupportedOperationInTransactionException {
    throw new UnsupportedOperationInTransactionException(
        String.format("rollback() operation %s meant for Dist Tx is not supported",
            "setRollbackMessage"));
  }
TxState on TX coordinator, created when coordinator is also a data node
geode-core/src/main/java/org/apache/geode/internal/cache/DistTXStateOnCoordinator.java