protected Set<Customer> getCustomerSet(int size) {
    Set<Customer> expectedSet = new HashSet<>();
    for (int i = 0; i < size; i++) {
      expectedSet.add(new Customer("customer" + i, "address" + i));
    }
    return expectedSet;
  }
@return first key found on the given member
geode-core/src/distributedTest/java/org/apache/geode/internal/cache/RemoteTransactionDUnitTest.java