@Override
      public void beforeUpdate(EntryEvent event) throws CacheWriterException {
        fail("cache writer should not be invoked");
      }
test has a client, two accessors and a datastore pool connects to two accessors. we then close
the server in first accessor and verify failover
geode-core/src/distributedTest/java/org/apache/geode/internal/cache/ClientServerTransactionDUnitTest.java