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Re: ignore long locked inactive cache entry

Gena Makhomed
May 07, 2021 03:42PM
On 07.05.2021 21:19, Maxim Dounin wrote:

>> [alert] 2569378#2569378: *449013402 open socket #29 left in connection 3
>> [alert] 2569378#2569378: *449013403 open socket #32 left in connection 8
>> [alert] 2569378#2569378: aborting

[...]

>> Конфиг бекенда, на котором была эта ошибка, примерно такой:
>>
>> aio threads;
>> aio_write on;
>
> Скорее всего в данном случае дело в aio_write, см.
> https://trac.nginx.org/nginx/ticket/2162.

Понятно, спасибо!

Максим, Вы говорите в комментариях к этому тикету:

> It is not expected to affect real-world use cases,
> though probably worth fixing anyway.

У меня этот bug проявился именно что в real-world use case.

> If the worker process exits prematurely while a requests updates
> the cache with proxy_cache_use_stale updating;, the cache item
> is stuck in the UPDATING state and won't be updated till the cache
> is reloaded (for example, due to nginx restart or binary upgrade).

> As already explained in comment:2, this is not expected to happen
> in real-world use cases. If you want to be completely safe from
> the particular issue, avoid using aio,
> most notably avoid aio_write on;.

Другими словами aio и aio_write пока что еще не production ready.
Неожиданно, что этот момент не отображен в документации к nginx.

--
Best regards,
Gena

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Subject Author Posted

ignore long locked inactive cache entry

Gena Makhomed May 07, 2021 11:26AM

Re: ignore long locked inactive cache entry

Maxim Dounin May 07, 2021 02:20PM

Re: ignore long locked inactive cache entry

Gena Makhomed May 07, 2021 03:42PM

Re: ignore long locked inactive cache entry

Maxim Dounin May 07, 2021 05:38PM

Re: ignore long locked inactive cache entry

Gena Makhomed May 08, 2021 05:26AM



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