我应该打开redis发行锁的守望狗吗
我正在通过使用redis 设置（如果不存在）命令来实现分布锁定，现在面临某些分发锁任务花费超过时间的问题。这将导致一些问题，我读到Redisson提供了一种称为观看Dog的解决方案。如果任务在到期的时间内未完成，那么Redisson可能会启动线程续订锁定时间。我的问题是：
- 使用看守狗是一个好习惯吗？因为手表狗线将使服务器付费资源成为服务器付费资源，所以它将通过分布锁的数量增加重新汇编。
I am implementing the distribution lock by using redis set if Not exists command, now facing a issue that some distribution lock task spent more than expire time. This would cause some issue, and I read that redisson give a solution that called watch dog. the redisson may start a thread to renew the lock expire time if the task not finished in the expire time. My question is:
- is it a good practice to use the watch dog? because the watch dog thread will make the server pay resource, it will increase the resouce requrement by the number of distribution lock.
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我会说这取决于。通常我们不需要看门狗。因为在大多数情况下，我们可以通过一些指标来估算代码的执行时间。我们可以将到期时间设置为比任务执行时间大一点。但是，如果任务的执行时间不稳定，我们无法估计它，那么我认为需要看守狗。由于锁定案例可能会更加逐渐发生。
I would say it depends. Normally we don't need a watch dog. Because in most cases, we can estimate the execution time of our code by some kink of metrics. And we can set the expire time a little larger than the task execution time. But if the execution time of the task is not stable, and we can not estimate it, then I think the watch dog is needed. Since lock-expire cases can occure more offenly.