[erlang-questions] How would you implement TTL for ETS based cache?

Max Bourinov <>
Thu Mar 14 15:38:53 CET 2013


Hi Dmitry,

Thank you for sharing your code. Do you plan to add some docs to it?

Do you use this project? At which state it is now?

Best regards,
Max



On Thu, Mar 14, 2013 at 3:29 PM, Dmitry Kolesnikov
<>wrote:

> Hello Max,
>
> I have been experimenting with similar approach. The main idea was to keep
> a two ETS based indexes. The first one it key-value map, second is
> expire-key map. Second index allows you to handle eviction. You have a
> process that evict a items when they are expired.
>
> I did a quick proto but never had opportunity to evolve it further.
> https://github.com/fogfish/cache
>
> It would be excellent to get community comments on it.
>
>
> Best Regards,
> Dmitry >-|-|-*>
>
>
> On 14.3.2013, at 16.15, Max Bourinov <> wrote:
>
> Hi Erlangers,
>
> How would you implement TTL with callback for ETS based cache?
>
> I want when TTL expires callback is triggered and cached value goes to DB.
>
> For key I use 32 byte long binary(), value is not bigger than 8 KB.
>
> Any suggestions?
>
> p.s. elang:send_after/3 is a most brutal approach, but how would it be
> when cache is under load?
>
> Best regards,
> Max
>
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