Burak Yavuz created SPARK-30669:
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Summary: Introduce AdmissionControl API to Structured Streaming
Key: SPARK-30669
URL: https://issues.apache.org/jira/browse/SPARK-30669
Project: Spark
Issue Type: Improvement
Components: Structured Streaming
Affects Versions: 2.4.4
Reporter: Burak Yavuz
In Structured Streaming, we have the concept of Triggers. With a trigger like
Trigger.Once(), the semantics are to process all the data available to the
datasource in a single micro-batch. However, this semantic can be broken when
data source options such as `maxOffsetsPerTrigger` (in the Kafka source) rate
limit the amount of data read for that micro-batch.
We propose to add a new interface `SupportsAdmissionControl` and `ReadLimit`. A
ReadLimit defines how much data should be read in the next micro-batch.
`SupportsAdmissionControl` specifies that a source can rate limit its ingest
into the system. The source can tell the system what the user specified as a
read limit, and the system can enforce this limit within each micro-batch or
impose it's own limit if the Trigger is Trigger.Once() for example.
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