[GitHub] [iceberg] luoyuxia commented on issue #6153: I found duplicate records when i was repeatedly exporting records from CDC Stream into iceberg partitioned table

[GitBox <gi...@apache.org>]

luoyuxia commented on issue #6153:
URL: https://github.com/apache/iceberg/issues/6153#issuecomment-1308443668

   May the reason is that the key in source is `id`, but the primary key in sink `dt,id`. The primary keys for source and sink aren't equal.
   Is possible for the following case?
   ```
   +I['bob', 1, 20221109]
   -U['bob', 1,  20221109]
   +U['bob', 1,  20221110]
   ```
   And then in the upsert iceberg, `+I['bob', 1, 20221109]`, +U['bob', 1,  20221110]  will  be considered as different records since they has different keys.
   
   
   You can try to update you sink to 
   ```
   CREATE TABLE  IF NOT EXISTS iceberg.test_db.test_cdc(
   `username` STRING, 
     `id` int, 
      start_time String,
     `dt` string,
      PRIMARY KEY(`id`)  NOT ENFORCED
   )partitioned by (dt) 
   WITH (
      'write.format.default'='parquet',
      'format-version' = '2' ,
      'write.upsert.enabled'='true',
      'location' = 's3a://xxxxxx/xxx/xxx'
   );
   ```
   and see whether the duplicated records are still in here or not.
   


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