Configurable batch size #389
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rebalances in case of long processing time
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milindl
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Oct 21, 2025
| @@ -1,3 +1,12 @@ | |||
| # confluent-kafka-javascript 1.6.1 | |||
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| v1.6.1 is a maintenance release. It is supported for all usage. | |||
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| - An API compatible version of `eachBatch` is available, maximum batch size | ||
| can be configured through the `js.consumer.max.batch.size` configuration property | ||
| and defaults to 32. |
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| - An API compatible version of `eachBatch` is available, maximum batch size | |
| can be configured through the `js.consumer.max.batch.size` configuration property | |
| and defaults to 32. | |
| - An API compatible version of `eachBatch` is available, maximum batch size | |
| can be configured through the `js.consumer.max.batch.size` configuration property | |
| and defaults to 32. It is not dependent on the size of the batches present on the broker, as the batches are constructed client-side. |
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Also, I think we should add that while we start attempting to fill batches with js.consumer.max.batch.size, it may be scaled down based on the actual messages received.
| this.#cacheExpirationTimeoutMs = this.#maxPollIntervalMs; | ||
| rdKafkaConfig['max.poll.interval.ms'] = this.#maxPollIntervalMs * 2; | ||
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| if (rdKafkaConfig['js.consumer.max.batch.size'] !== undefined) { |
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| if (rdKafkaConfig['js.consumer.max.batch.size'] !== undefined) { | |
| if (Object.hasOwn(rdKafkaConfig, 'js.consumer.max.batch.size')) { |
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… one partition and there are messages being fetched for other partitions
…me before first assignment
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Analysis Details12 Issues
Coverage and Duplications
Project ID: confluent-kafka-javascript |
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Closes #286.
batch size is now configurable through the 'js.max.batch.size` property (-1 for unlimited batch size). Even when unlimited batch sizes are actually limited by librdkafka consumer buffer.
Checklist
Test & Review
automatic tests and running the performance example