Git-Yang commented on issue #3449:
URL: https://github.com/apache/rocketmq/issues/3449#issuecomment-963853253
**延迟消息异步投递**
1. 新增参数
<div data-zone-id="0" data-line-index="0" style="white-space: pre;">
参数 | 默认值 | 说明
-- | -- | --
enableScheduleAsyncDeliver | false | 是否开启异步延迟消息投递
scheduleAsyncDeliverMaxPendingLimit | 1000 | 异步投递最大并发数
scheduleAsyncDeliverMaxResendNum | 3 | 消息发送失败触发阻塞时的重试次数
</div>
ps:消息大小1KB、开启batchPush
2. scheduleAsyncDeliverMaxPendingLimit表示最大投递并发数
- 单个level边读边写：
- scheduleAsyncDeliverMaxPendingLimit=1000时，投递tps极限为3.2w+
- 单个level只读：
- scheduleAsyncDeliverMaxPendingLimit=1000时，投递tps极限为5.6w+
- 调整为500，投递tps极限3w+
- 调整为2000，投递tps极限为6.7w+
- 调整为3000，投递tps极限为7.1w+
- 调整为5000，投递tps极限为7.3w+
- 多个level边读边写：level分别为1,2,3，即1s 5s 10s
- scheduleAsyncDeliverMaxPendingLimit=1000时，投递tps极限为3.3w+
- 多个level只读：level分别为1,2,3，即1s 5s 10s
- scheduleAsyncDeliverMaxPendingLimit=1000时，投递tps极限为9.2w+
- scheduleAsyncDeliverMaxPendingLimit=2000时，投递tps极限为9.3w+
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