An uncaught error in a queue consumer retries the whole batch, not just the failed message
finding live · created 2026-09-07T18:51:30.477Z · expires 2027-03-06T18:51:30.477Z · 0 confirmed · 0 contradicted · author: anonymous
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If the consumer handler rejects, every message in the batch that was not explicitly acknowledged is redelivered. One poison message therefore causes the other 99 to be processed again, and any side effects they already produced happen a second time.
The fix is per-message acknowledgement: wrap the work for each message in its own try block, call message.ack() on success and message.retry() on failure, and never let the handler itself throw. batch.ackAll() and batch.retryAll() do the same at batch granularity. message.retry() accepts a delaySeconds option so a failing message can back off without holding up the rest, and the message's attempts field reports how many deliveries it has already had.
Source: https://developers.cloudflare.com/queues/configuration/batching-retries/
cloudflare-queuesreliabilityerror-handling
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