[jira] [Created] (HUDI-4119) the first read result is incorrect when Flink upsert- Kafka connector is used in HUDi

["yanxiang (Jira)" <ji...@apache.org>]

yanxiang created HUDI-4119:
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             Summary: the first read result is incorrect  when Flink upsert- Kafka connector is used in  HUDi 
                 Key: HUDI-4119
                 URL: https://issues.apache.org/jira/browse/HUDI-4119
             Project: Apache Hudi
          Issue Type: Bug
            Reporter: yanxiang
             Fix For: 0.11.0


 the first read result is incorrect  when Flink upsert- Kafka connector is used in  HUDi .
 
 ETL  path: flink upsert-kafka connector -> hudi table (MOR table,query by stream)
 
Here is the case:
 
1. the first time: write two records  with the same primary key into kafka, and  insert them into hudi table. the query result should be three records: +I first record, -U first record, +U second record; But the first time I query hudi table, I found that all the data operation were +I: +I first record,+I first record and +I second record, and there was no update operation; 
 Three times +I has affected hudi's subsequent ETL process-the data of  groupBy is inaccurate; 
2. Second time: Exit the first query, restart the query job of hudi table, and the query results are normal: +I first data, -U first data, +U second data.
 
Reason:
Reason:There is a bug in the program. When no data log file is generated, the Schema does not include the column' _ hoodie _ operation'.Please refer to the following link for details：
[https://www.jianshu.com/p/29f9ec5e606e]



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