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Posted to issues@spark.apache.org by "Jungtaek Lim (Jira)" <ji...@apache.org> on 2023/10/18 06:50:00 UTC

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

     [ https://issues.apache.org/jira/browse/SPARK-45558?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jungtaek Lim reassigned SPARK-45558:
------------------------------------

    Assignee: Chaoqin Li

> 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
>            Assignee: Chaoqin Li
>            Priority: Major
>              Labels: pull-request-available
>
> 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.
> The metadata file will improve expose more information about the state store, improves debugability and facilitate the development of state related feature such as reading and writing state and state repartitioning.



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