@Override
    public void beforeDestroy(EntryEvent event) throws CacheWriterException {
      if (oneDestroy) {
        fail("only one destroy expected");
      } else {
        if (oneCreate) {
          fail("destroy is supposed to precede create");
        } else {
          oneDestroy = true;
        }
      }
    }
@return first key found on the given member
geode-cq/src/distributedTest/java/org/apache/geode/internal/cache/RemoteCQTransactionDUnitTest.java