nicktelford opened a new pull request, #22597: URL: https://github.com/apache/kafka/pull/22597
Introduces the `statestore.uncommitted.max.bytes` config, which triggers an early commit when the total uncommitted bytes across all transactional state stores on a thread exceeds the configured limit, regardless of `commit.interval.ms`. This bounds the memory consumed by pending write buffers under high write throughput. The limit is divided equally across StreamThreads and the GlobalStreamThread. Each thread independently enforces its share: StreamThreads trigger an early task commit via `maybeCommit()`; the GlobalStreamThread flushes at the end of each `pollAndUpdate()` cycle. `StateStore` gains a default `approximateNumUncommittedBytes()` method (returning 0); adapter and wrapper classes delegate to the inner store. Metered key-value stores register an uncommitted-bytes gauge. Segmented and versioned stores aggregate across their underlying segments. The per-thread limit is recomputed whenever stream threads are dynamically added or removed via `addStreamThread()`/`removeStreamThread()`, mirroring the existing thread-cache resize logic. The per-thread limit field is `volatile` so running threads pick up the new value on their next commit check without synchronisation. This is part of [KIP-892](https://cwiki.apache.org/confluence/display/KAFKA/KIP-892%3A+Transactional+Semantics+for+State+Stores), stacked on #22323 (KAFKA-20490, merged). -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
