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    <title>延迟队列的四种实现方案：从数据库轮询到 Redis 时间轮</title>
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    <author>Simon</author>
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    <description><![CDATA[延迟任务无处不在 下完订单 30 分钟未支付，自动关闭。优惠券到期前 1 小时，推送提醒。注册后 3 天未登录，发送召回邮件。这些场景的本质是同一个问题：在]]></description>
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