From: Derrick Stolee <stolee@gmail.com>
Date: Mon, 23 Sep 2024 01:26:40 GMT
Subject: Re: Prefetch maintenance might lead to thundering herd issues
Message-ID: <91bf8c63-b2fc-48ca-a6de-37a576ddc1b1@gmail.com>
In-Reply-To: <CAG=Um+2g-pn3XmC4MVkA+UAGeWpHw5U6fe=zXR=6-ibu3d0qsg@mail.gmail.com>

On 9/22/24 2:40 PM, Shubham Kanodia wrote:
> On Sat, Sep 21, 2024 at 1:20 AM Derrick Stolee <stolee@gmail.com> wrote:

>> This is already handled by using a random minute of the hour, as
>> implemented in 9b43399057 (maintenance: use random minute in cron
>> scheduler, 2023-08-10), for example. There are similar uses for
>> systemd, launchctl, and schtasks schedulers (look for uses of
>> the get_random_minute() method).

> Ah, thanks for pointing that out. It wasn't really clear from the
> multiple examples and cron expressions on the git
> maintenance documentation page (which have examples such as `0 1-23 *
> * *` for hourly). I should've looked
> more deeply into the implementation.
> 
> Perhaps adding a line to the existing doc might be of help? What do
> you think about adding a line to the
> section on scheduling —

I do think a doc change would help. Please submit it as a patch for
review!

Thanks,
-Stolee