KIP-990 — Capability to PAUSE Tasks on DeserializationException

Discussion Streams

Adds a `PAUSE` return value to the Kafka Streams `DeserializationExceptionHandler` that suspends the affected task without killing the stream thread. The existing options are `FAIL` (crash the thread) or `CONTINUE` (skip and log), with no way to pause processing on a bad record until an operator intervenes.

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