我对我的代码有以下反查询：

private CounterSlice<String> queryLastCounts(Long key, String columnFamily,
                                                            int maxLength) {
    SliceCounterQuery<Long, String> query = 
            HFactory.createCounterSliceQuery(cassandra.getKeyspace(), 
                                                            LONG_S, STRING_S);
    query
        .setColumnFamily(columnFamily)
        .setKey(key)
        .setRange("", "", true, maxLength);
    return query.execute().get();
}

在我的单元测试中，代码运行得非常好。但在运行正确的应用程序时（我使用的是storm），会出现以下错误：

Caused by: InvalidRequestException(why:String didn't validate.)
at org.apache.cassandra.thrift.Cassandra$get_slice_result.read(Cassandra.java:7756)
at org.apache.cassandra.thrift.Cassandra$Client.recv_get_slice(Cassandra.java:570)
at org.apache.cassandra.thrift.Cassandra$Client.get_slice(Cassandra.java:542)
at me.prettyprint.cassandra.service.KeyspaceServiceImpl$8.execute(KeyspaceServiceImpl.java:308)
... 25 more

我还利用赫克托访问Cassandra。