Shared dictionary serialization and locking

calin · 2013-07-04T01:03:43+00:00

Hello! On Wed, Jul 3, 2013 at 2:03 AM, fc23229 wrote: > Actually to clarify my question in the original post, I mean is there a > difference between...

Shared dictionary serialization and locking

calin

Hi,

I need to serialize few requests that come in parallel to an nginx server. I'm thinking of using shared dictionaries and lua for this.

I want to ask if there is some kind of locking between multiple nginx workers accessing a shared dictionary and if the accesses can be serialized.

I need to achieve something like N requests come at about same time, first which reaches the server sets and expiring lock using dict.safe_add and all other requests return 202 Accepted.

Thanks!

agentzh

Hello!

On Wed, Jul 3, 2013 at 10:03 AM, Calin Don wrote:
> I want to ask if there is some kind of locking between multiple nginx
> workers accessing a shared dictionary and if the accesses can be serialized.
>

Yes. There's a spin lock involved.

> I need to achieve something like N requests come at about same time, first
> which reaches the server sets and expiring lock using dict.safe_add and all
> other requests return 202 Accepted.
>

This should work :)

Best regards,
-agentzh

calin.don

Thanks! Will explore this path then.

On Wed, Jul 3, 2013 at 9:44 PM, Yichun Zhang (agentzh) <age...@gmail.com> wrote:

Hello!

On Wed, Jul 3, 2013 at 10:03 AM, Calin Don wrote:
> I want to ask if there is some kind of locking between multiple nginx
> workers accessing a shared dictionary and if the accesses can be serialized.
>

Yes. There's a spin lock involved.

> I need to achieve something like N requests come at about same time, first
> which reaches the server sets and expiring lock using dict.safe_add and all
> other requests return 202 Accepted.
>

This should work :)

Best regards,
-agentzh
.