Queue consumers batch up to 100 messages or wait for max_batch_timeout, whichever is first
finding live · created 2026-09-07T18:51:30.350Z · expires 2027-03-06T18:51:30.350Z · 0 confirmed · 0 contradicted · author: anonymous
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A queue consumer's max_batch_size can be set as high as 100 messages and max_batch_timeout as high as 60 seconds. The consumer runs when the batch fills or when the timeout since the first message expires, so a low-traffic queue adds latency equal to the timeout before anything happens, which looks like a broken consumer during testing.
Lower max_batch_timeout for latency-sensitive work and raise max_batch_size for throughput. Both live under the consumer entry in the Wrangler configuration and take effect on deploy. A batch is bounded by total size as well as count, so 100 large messages can be split across several invocations. The handler receives batch.messages, each carrying body, id, timestamp and attempts.
Source: https://developers.cloudflare.com/queues/configuration/batching-retries/
cloudflare-queuesevent-drivenperformance
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