[GitHub] [iceberg] zhangpengbigdata opened a new issue, #6153: I found duplicate records when i was repeatedly exporting records from CDC Stream into iceberg partitioned table

[GitBox]

zhangpengbigdata opened a new issue, #6153:
URL: https://github.com/apache/iceberg/issues/6153

   ### Query engine
   
   Iceberg 1.0.0 Flink1.13 
   
   ### Question
   
   Hi all,
   I found duplicate records when i was repeatedly exporting records from CDC 
Stream into iceberg partitioned table.  Could you please help me ?
   
   Iceberg 1.0.0, Flink1.13
   SQL like this:
   ```
   CREATE CATALOG iceberg WITH (
     'type'='iceberg',
     'catalog-type'='hive',
     'uri'='thrift://xxxx:9083',
     'clients'='5',
     'property-version'='1',
     'warehouse'='s3a://xxxx/xxxx/'
   );
   
     CREATE TABLE test_cdc ( 
     `username` varchar(100), 
     `id` int, 
      start_time String,
     PRIMARY KEY (`id`)  NOT ENFORCED
     ) WITH (
       'connector' = 'mysql-cdc',
       'hostname' = 'xxxxxx',
       'port' = '3306',
       'username' = 'xxx',
       'password' = 'xxx',
       'database-name' = 'xxx',
       'table-name' = 'xxx'
     );
   CREATE TABLE  IF NOT EXISTS iceberg.test_db.test_cdc(
   `username` STRING, 
     `id` int, 
      start_time String,
     `dt` string,
      PRIMARY KEY(`dt`, `id`)  NOT ENFORCED
   )partitioned by (dt) 
   WITH (
      'write.format.default'='parquet',
      'format-version' = '2' ,
      'write.upsert.enabled'='true',
      'location' = 's3a://xxxxxx/xxx/xxx'
   );
   INSERT INTO iceberg.test_db.test_cdc
   SELECT 
     `username`,
     `id`, 
   start_time,
     FROM_UNIXTIME(cast(start_time as bigint)  / 1000, 'yyyyMMdd') as dt 
   FROM test_cdc ;
   ```
   Executed flink sql, the result is:
   select count(distinct id), count(id),dt from iceberg.test_db.test_cdc group 
by dt order by dt
   <img width="579" alt="clipboard" 
src="https://user-images.githubusercontent.com/116717900/200744200-61199ef0-81c7-4e56-bca9-3e0b1e5aeebe.png";>
   Rerun the flink sql,  the result is:
   select count(distinct id), count(id),dt from iceberg.test_db.test_cdc group 
by dt order by dt
   <img width="590" alt="clipboard2" 
src="https://user-images.githubusercontent.com/116717900/200744267-7973fcd1-73e9-4796-85fa-2d80092e3214.png";>
   
   


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