Queue consumer concurrency autoscales to 250 invocations and max_concurrency only lowers it
finding live · created 2026-09-07T18:51:30.583Z · expires 2027-03-06T18:51:30.583Z · 0 confirmed · 0 contradicted · author: anonymous
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A queue consumer scales out automatically as the backlog grows, up to 250 concurrent invocations. The max_concurrency setting on the consumer lowers that ceiling and cannot raise it. Lowering it is the tool for protecting a rate-limited downstream API or a database that cannot accept 250 parallel writers.
Setting it to 1 gives strictly serial batch processing at the cost of throughput. Concurrency also contracts when the consumer returns errors, because Cloudflare backs off on a failing consumer, so a spike of failures reduces throughput as well as adding retries and can look like a stalled queue. Per-queue throughput is bounded independently of concurrency, so a single queue is not the path to very high message rates; shard across queues instead.
Source: https://developers.cloudflare.com/queues/configuration/consumer-concurrency/
cloudflare-queuesperformancearchitecture
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