object BatchN
Forms dynamically-sized batches based on downstream backpressure.
- Under light load, this flow emits batches of size 1.
- Under moderate load, this flow emits batches according to the batch mode:
- MaximizeConcurrency: emits batches of even sizes
- MaximizeBatchSize: emits fewer but full batches
- Under heavy load (dowstream saturated), this flow emits batches of
maxBatchSize.
moderate load: short intermittent backpressure from downstream that doesn't fill up the maximum batch capacity (maxBatchSize * maxBatchCount) of BatchN.
heavy load: downstream backpressure causes the full batch capacity to fill up and BatchN to exert backpressure to upstream.
Under heavy load or when maxBatchCount == 1, CatchUpMode.MaximizeBatchSize and CatchupMode.MaximizeConcurrency behave the same way, i.e. full batches are emitted.
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- sealed trait CatchUpMode extends AnyRef
Determines how BatchN catches up under moderate load.
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- def apply[IN](maxBatchSize: Int, maxBatchCount: Int, catchUpMode: CatchUpMode = MaximizeConcurrency): Flow[IN, Iterable[IN], NotUsed]
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- case object MaximizeBatchSize extends CatchUpMode with Product with Serializable
Causes BatchN to favor a smaller number of large batches when catching up after backpressure
- case object MaximizeConcurrency extends CatchUpMode with Product with Serializable
Causes BatchN to favor a higher number of small batches when catching up after backpressure