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Posted to issues@spark.apache.org by "Chaoqin Li (Jira)" <ji...@apache.org> on 2023/10/16 17:24:00 UTC

[jira] [Created] (SPARK-45558) Introduce a metadata file for streaming stateful operator

Chaoqin Li created SPARK-45558:
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             Summary: Introduce a metadata file for streaming stateful operator
                 Key: SPARK-45558
                 URL: https://issues.apache.org/jira/browse/SPARK-45558
             Project: Spark
          Issue Type: Improvement
          Components: Structured Streaming
    Affects Versions: 3.5.0
            Reporter: Chaoqin Li


The information to store in the metadata file:
 * operator name (no need to be unique among stateful operators in the query)

 * state store name
 * numColumnsPrefixKey: > 0 if prefix scan is enabled, 0 otherwise

The body of metadata file will be in json format. The metadata file will be versioned just as other streaming metadata file to be future proof.



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