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Posted to issues@spark.apache.org by "Jose Torres (Jira)" <ji...@apache.org> on 2026/06/04 21:57:00 UTC
[jira] [Resolved] (SPARK-57134) Implement SCD2 Batch Processor; Preprocess Microbatch
[ https://issues.apache.org/jira/browse/SPARK-57134?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Jose Torres resolved SPARK-57134.
---------------------------------
Fix Version/s: 4.3.0
Resolution: Fixed
Issue resolved by pull request 56208
[https://github.com/apache/spark/pull/56208]
> Implement SCD2 Batch Processor; Preprocess Microbatch
> -----------------------------------------------------
>
> Key: SPARK-57134
> URL: https://issues.apache.org/jira/browse/SPARK-57134
> Project: Spark
> Issue Type: Sub-task
> Components: Declarative Pipelines
> Affects Versions: 4.3.0
> Reporter: Anish Mahto
> Assignee: Anish Mahto
> Priority: Major
> Labels: pull-request-available
> Fix For: 4.3.0
>
>
> {*}Preamble{*}:
> The SCD type 2 flow is a foreachBatch streaming query on an input change-data-feed, and is responsible for reconciling the incoming change data onto some target table that follows SCD2 replication semantics.
> SCD2 flows also maintain an "auxiliary" table to keep track of early-arriving out-of-order received events state. Each microbatch will need to reconcile against this auxiliary table as well, and update the auxiliary table's state appropriately for future microbatches.
>
> *Preprocess Microbatch*
> For SCD2, preprocessing the microbatch is all about getting it in the right shape, aligned with the shape of the target table the microbatch will be merged into + the shape that SCD2 itself as a standard demands.
> That is:
> * The microbatch must have a start-at and end-at columns projected as per the SCD2 standard, to indicate that a historical/alive record was active between those sequence stamps
> * The microbatch will have the operational CDC metadata column projected, which is needed to reconcile late arriving events/bookkeeping
> * As per the Spark AutoCDC API, the microbatch should project down to just the user-specified column selection
> Implement the part of the core SCD2 microbatch processor that does this microbatch preprocessing.
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