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Posted to issues@flink.apache.org by "Shangshu Qian (Jira)" <ji...@apache.org> on 2025/09/16 20:05:00 UTC

[jira] [Created] (FLINK-38368) Potential Feedback Loop Involving a Heavy User Defined Aggregation Task

Shangshu Qian created FLINK-38368:
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             Summary: Potential Feedback Loop Involving a Heavy User Defined Aggregation Task
                 Key: FLINK-38368
                 URL: https://issues.apache.org/jira/browse/FLINK-38368
             Project: Flink
          Issue Type: Bug
    Affects Versions: 1.20.0
            Reporter: Shangshu Qian


The delay begins at the reduction of a “User-defined function”, which can be heavy by itself.
-> The intermediate task got delayed and cannot transition to the RELEASED state.
-> The barrier task fails because one of the intermediate task does not finish, throwing runtime exceptions.
-> Such a task can be retried, causing further increment in the aggregation task.



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