[jira] [Updated] (FLINK-19795) Flink SQL throws exception when changelog source contains duplicate change events

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

     [ https://issues.apache.org/jira/browse/FLINK-19795?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jark Wu updated FLINK-19795:
----------------------------
    Summary: Flink SQL throws exception when changelog source contains duplicate change events  (was:  When TOPN handles duplicate data, it will throw an exception)

> Flink SQL throws exception when changelog source contains duplicate change events
> ---------------------------------------------------------------------------------
>
>                 Key: FLINK-19795
>                 URL: https://issues.apache.org/jira/browse/FLINK-19795
>             Project: Flink
>          Issue Type: Bug
>          Components: Table SQL / Runtime
>    Affects Versions: 1.11.2
>            Reporter: jinxin
>            Priority: Major
>
> We are using Canal to synchornize MySQL data into Kafka, the synchornization delivery is not exactly-once, so there might be dupcliate INSERT/UPDATE/DELETE messages for the same primary key. We are using {{'connecotr' = 'kafka', 'format' = 'canal-json'}} to consume such topic. However, when appling TopN query on this created source table, the TopN operator will thrown exception: {{Caused by: java.lang.RuntimeException: Can not retract a non-existent record. This should never happen. }}



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