如何使用PIG和Cassandra CqlStorage删除数据

Question

我正在尝试使用Pig删除数据Cassandra。该文档仅指示＆＃34;更新语句＆＃34;：http://www.datastax.com/docs/datastax_enterprise3.1/solutions/about_pig。也许唯一的方法是创建一个＆＃34; Pig UDF＆＃34;删除该数据。

模式

CREATE KEYSPACE keyspace_test WITH replication = {'class':'SimpleStrategy', 'replication_factor':2};
CREATE TABLE user (name text,last_name text,adress text,PRIMARY KEY (name));
INSERT INTO user (name, last_name, adress) VALUES ('albert','griffith', 'street example1');
INSERT INTO user (name, last_name, adress) VALUES ('adam','garcia', 'street example2');

脚本猪

users = LOAD 'cql://keyspace_test/user' USING CqlStorage();
user = filter users by name == 'adam';
data_to_delete = FOREACH user GENERATE TOTUPLE(TOTUPLE('name',name)),() ;
STORE data_to_delete INTO 'cql://keyspace_test/user?output_query=DELETE+FROM+keyspace_test.user' USING CqlStorage;

结果

虽然表明一切正常，但它没有删除cassandra数据：

输入（S）：

Successfully read 2 records from: "cql://keyspace_test/user"

输出（一个或多个）：

Successfully stored 1 records in: "cql://keyspace_test/user?output_query=DELETE+FROM+keyspace_test.user"

计数器：

Total records written : 1
Total bytes written : 0
Spillable Memory Manager spill count : 0
Total bags proactively spilled: 0
Total records proactively spilled: 0