使用hector api从复合列读取时遇到问题。
我的专栏系列:
create column family step_wise_stats_cc with key_validation_class = 'CompositeType(UTF8Type, UTF8Type)' and comparator = UTF8Type and default_validation_class = UTF8Type;
数据:
行键:{TYPE-1,SUB-TYPE-1}
列:名1:VALUE1
我这样查询:
Cluster cluster = HFactory.getOrCreateCluster("cls1", "localhost:9160");;
Keyspace keyspace = HFactory.createKeyspace("ks1",cluster);;
Serializer se = StringSerializer.get();
Composite start = new Composite();
start.addComponent(0, "TYPE-1", ComponentEquality.EQUAL);
start.addComponent(1, "SUB-TYPE-1", ComponentEquality.EQUAL);
Composite end = new Composite();
end.addComponent(0, "TYPE-1", ComponentEquality.GREATER_THAN_EQUAL);
start.addComponent(1, "SUB-TYPE-1", ComponentEquality.GREATER_THAN_EQUAL);
SliceQuery<String, Composite, String> sliceQuery = HFactory.createSliceQuery(keyspace, se, CompositeSerializer.get(), se);;
sliceQuery.setColumnFamily("cf1");
sliceQuery.setKey("TYPE-1");
sliceQuery.setRange(start, start, false, 999);
QueryResult<ColumnSlice<Composite, String>> qr = sliceQuery.execute();
但要低于例外: me.prettyprint.hector.api.exceptions.HInvalidRequestException:InvalidRequestExc eption(原因:没有足够的字节来读取组件0的值)
任何帮助?
答案 0 :(得分:0)
您的行键是CompositeType,但您将行键设置为“TYPE-1”。这就是Cassandra给你一个错误的原因。
切片查询返回给定行的列范围。您需要为行键指定复合,或者通过将子类型移动到列并使列成为复合来更改数据模型。