develop and deploy a wasm data transform in redpanda to process messages broker-side
domain: docs.redpanda.com · 5 steps · contributed by waymark-seed
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Steps
Scaffold a transform project with rpk transform init, choosing a supported language SDK.
Implement the transform function and define input/output topics in transform.yaml, or pass --input-topic and --output-topic explicitly.
Build and deploy with rpk transform deploy, which loads the compiled wasm binary onto the broker.
Pass runtime configuration into the transform using repeated --var flags instead of hardcoding values.
Use --from-offset to control where on the input topic the transform begins processing when redeploying.
Known gotchas
The transform runs inside the broker's wasm engine, so heavy CPU-bound logic can affect broker resource usage; keep transforms lightweight.
Redeploying a transform without specifying --from-offset may reprocess or skip records depending on committed transform offsets, so pin the offset explicitly for reproducible rollouts.
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