Comments for igvita.com

Comment on Zero-Downtime Restarts with HAProxy by oliver

oliver — Thu, 02 Jul 2009 13:59:03 +0000

Hi Ilya,

I quickly added a stateless page so no session are created and now it works perfectly! Sorry for the post but as the server were marked as down even without the option httpchk I thougt it is sufficient.

Oliver

Comment on Zero-Downtime Restarts with HAProxy by Ilya Grigorik

Ilya Grigorik — Thu, 02 Jul 2009 13:20:42 +0000

Oliver: Ah, you do need the option httpchk in there! That’s how HAProxy determines that the server is down (after two unsuccessful hits to your server). Otherwise it’ll continue dispatching requests to that host, and will redispatch (if you have it enabled) once it determines that server is down.

Comment on Zero-Downtime Restarts with HAProxy by oliver

oliver — Thu, 02 Jul 2009 12:59:38 +0000

Hi Ilya,
I rechecked your recommended chapter and the only difference is that I do not declare “option httpchk HEAD / HTTP/1.0″ as this creates a new jsession every 2 seconds on my tomcat servers.

if I start the maintenance mode for the server then it is marked as down in the haproxy interface while the backup instance is still up. The chapter “4.2 Soft-stop using backup server” states that clients with a valid cookie will still reach the backup server. So if I already got a cookie assigned and my server is in maintenance mode what will take care that I do nor reach the backup again? Does the cookie expire?

This is my test:
1. Loggin in my application
2. check which server I got assigned
3. put the server server in maintenance mode
4. logout of my application - > invalidate the jsession
5. if log in again im still get the same server which is in maintenance.

Thank you for your help,
Oliver

Comment on Tokyo Cabinet: Beyond Key-Value Store by Tokyo Cabinet plugin for Rails « Jabberwocky

Tokyo Cabinet plugin for Rails « Jabberwocky — Wed, 01 Jul 2009 21:08:02 +0000

[...] got to know it through this post of Ilya Grigorik where he basically says it’s blazingly fast. And when he says it’s fast, I tend to [...]

Comment on HTTP PubSub: Webhooks & PubSubHubbub by Jeff Lindsay

Jeff Lindsay — Wed, 01 Jul 2009 04:28:51 +0000

There is no major implementation still running that I know of older than PayPal.

Comment on HTTP PubSub: Webhooks & PubSubHubbub by Ilya Grigorik

Ilya Grigorik — Wed, 01 Jul 2009 03:30:10 +0000

Jeff, can we actually pinpoint the first user / inventor of webhooks? I’d be curious to know.

Comment on Zero-Downtime Restarts with HAProxy by Ilya Grigorik

Ilya Grigorik — Wed, 01 Jul 2009 03:28:32 +0000

Oliver, it sounds like something may have gone wrong in the way you disabled the server (guessing: routing). Take a close look at section “4.2 Soft-stop using backup servers” in the HAProxy doc, it describes the scenario you’re looking for in great detail.

Comment on Concurrency is a Myth in Ruby by Ilya Grigorik

Ilya Grigorik — Wed, 01 Jul 2009 02:30:13 +0000

Corbin, Rails has become ‘thread-safe’ as of 2.3 release. There are still a few nasty locks in the router and a few other places, but there is a lot of progress in that area.

In terms servers, Phusion Passenger is a good option to explore - no need to worry about number of workers, etc.

Comment on HTTP PubSub: Webhooks & PubSubHubbub by Dev Blog AF83 » Blog Archive » Veille technologique : Annonces, Tendance, Standards, Produits, Méthodes, Outils de développement, Concours

Tue, 30 Jun 2009 17:18:58 +0000

[...] http://www.igvita.com/2009/06/29/http-pubsub-webhooks-pubsubhubbub/ : Webhooks et Pubsub sont 2 mot-clés à connaître [...]

Comment on Zero-Downtime Restarts with HAProxy by oliver

oliver — Tue, 30 Jun 2009 15:10:19 +0000

Hi,
I followed your example with sticky sessions but clients
who’s session are expired and the related server is in maintenance mode are directed to the server again
and new sessions are created. So I can not restart the server.

I think this is because of the cookie usage in the backup server definition?