[
https://issues.apache.org/jira/browse/SPARK-57134?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
ASF GitHub Bot updated SPARK-57134:
-----------------------------------
Labels: pull-request-available (was: )
> 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
> Priority: Major
> Labels: pull-request-available
>
> {*}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.
--
This message was sent by Atlassian Jira
(v8.20.10#820010)
---------------------------------------------------------------------
To unsubscribe, e-mail: [email protected]
For additional commands, e-mail: [email protected]
