如何为复合分区键生成Cassandra Token？

Question

我的Cassandra ColumnFamily使用Murmur3Partitioner,并有一个复合分区键.有了这个分区,我试图创建一个令牌,但似乎这个令牌工厂只允许Long值.是否可以为"token(partition_column1,partition_column2)"之类的东西生成这些哈希值？

Answer 1

它应该工作.实际上,如果您的分区键是复合键,则应该无法仅为单个列创建令牌.您确定已正确定义了复合键吗？

cqlsh:testks> create table t1(k1 int, k2 text, v text, primary key((k1, k2)));
cqlsh:testks> insert into t1(k1, k2, v) values (1, 'key', 'value');
cqlsh:testks> select * from t1;

 k1 | k2  | v
----+-----+-------
  1 | key | value

(1 rows)

cqlsh:testks> select token(k1) from t1;
Bad Request: Invalid number of arguments in call to function token: 2 required but 1 provided
cqlsh:testks> select token(k2) from t1;
Bad Request: Invalid number of arguments in call to function token: 2 required but 1 provided
cqlsh:testks> select token(k1, k2) from t1;

 token(k1, k2)
---------------------
 8064425790465501062

    (1 rows)