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Posted to dev@flink.apache.org by "Konstantin Knauf (Jira)" <ji...@apache.org> on 2021/04/21 07:40:00 UTC

[jira] [Created] (FLINK-22389) Expose Message Batches to SDKs

Konstantin Knauf created FLINK-22389:
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             Summary: Expose Message Batches to SDKs
                 Key: FLINK-22389
                 URL: https://issues.apache.org/jira/browse/FLINK-22389
             Project: Flink
          Issue Type: New Feature
          Components: Stateful Functions
            Reporter: Konstantin Knauf


Stateful Functions always invokes a functions with a batch of messages. Under normal operations the batch size=1 (no batching). 

If a function is slow and backpressure arises, the batch size grows, though. From an SDK perspective, this batching is not visible. The function is always invoked with a single message. This makes it impossible to efficiently evaluate the whole batch at once (e.g. with pandas). 

This issue was requested in http://apache-flink-user-mailing-list-archive.2336050.n4.nabble.com/Flink-Statefun-Python-Batch-tp43022.html. 



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