resonate-recursive-fan-out-pattern-rust

You can fan out parallel durable children using ctx.run or ctx.rpc to spawn independent DurableFuture invocations, await their results, and return an aggregated list. This ensures crash-safe replayable batch processing.

A durable recursive fan-out pattern spawns child workflows of the same durable function to traverse trees or crawl sites to a fixed depth. Each child is an independent durable unit, preserving ordering and supporting bounded concurrency with chunking.

You limit concurrency by processing child invocations in chunks, bounding the number of in-flight DurableFuture tasks. This chunking mechanism prevents resource exhaustion during large batch processing or map-reduce workloads.

Yes, you can optionally tolerate partial failures when awaiting results from spawned child workflows. This allows the parent workflow to continue aggregating successfully completed durable units instead of failing the entire batch.

Use durable workflows for batch processing when you need crash-safe replayable execution and independent retries for each unit. This is essential for enriching large batches of order IDs or map-reduce workloads where partial progress must survive failures.