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Message from discussion Should I use publish/subscribe?
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Salvatore Sanfilippo  
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 More options Jul 22 2011, 10:12 am
From: Salvatore Sanfilippo <anti...@gmail.com>
Date: Fri, 22 Jul 2011 16:12:03 +0200
Local: Fri, Jul 22 2011 10:12 am
Subject: Re: Should I use publish/subscribe?
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On Mon, Jul 18, 2011 at 8:31 AM, tianyuan <iamtiany...@gmail.com> wrote:
> I got about 100 web severs, and I want all of these logs get together.
> so I am thinking about using publish/subscribe in Redis.

> Every web server publishs to to the same channel,
> one log processer subscribe this channel, and process every log it
> received.

Hello,

it sounds like a good idea. You are not going to store the logs into
Redis right?
instead you are simply using Pub/Sub as a way to collect logs in a central way.

An alternative is to push instead into a list with LPUSH, and the
"processor" of stats will use BRPOP or alike to get new results. This
way you can stop the collector for some time and logs will accumulate
into Redis memory.

> When the subscriber get the log, is the log still in memory or
> completely disappeared ?

Completely disappeared. This is why you may want to use lists instead.
But depends on your use case.

However Pub/Sub or queues are a good way to communicate between many
instances without inventing your own networking layer.

Cheers,
Salvatore

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--
Salvatore 'antirez' Sanfilippo
open source developer - VMware

http://invece.org
"We are what we repeatedly do. Excellence, therefore, is not an act,
but a habit." -- Aristotele


 
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