@Override
      public Object call() {
        Region refRegion = getCache().getRegion(D_REFERENCE);
        assertThat(refRegion.get("sup")).isEqualTo("dawg");
        return null;
      }
@return first key found on the given member
geode-core/src/distributedTest/java/org/apache/geode/internal/cache/RemoteTransactionDUnitTest.java