Automatically diagnose IIS and ASP.NET website hangs
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Automatically diagnose IIS and ASP.NET website hangs
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Re: Automatically diagnose IIS and ASP.NET website hangs
#2This is pretty awesome for some types of hangs. I would bet most hangs developers experience are because of locking on SessionState. IReadOnlySessionState is your friend.
Re: Automatically diagnose IIS and ASP.NET website hangs
#3[deleted]
Re: Automatically diagnose IIS and ASP.NET website hangs
#4This is pretty awesome for some types of hangs. I would bet most hangs developers experience are because of locking on SessionState. IReadOnlySessionState is your friend.
hey bigdubs,
That's certainly a good one! One of the things we'll do to help resolve the hang is to identify where blocking is happening. This will pinpoint the session state module in AcquireRequestState as the culprit.
Although, I also have to say, IReadOnlySessionState wont help you a whole lot in a high volume site because the SessionStateModule will still connect to SQL server to keep the session alive in ReleaseRequestState. So, best advice I would give is to use the new AppFabric Cache based session state or go stateless.
Best, Mike
Re: Automatically diagnose IIS and ASP.NET website hangs
#5This is pretty awesome for some types of hangs. I would bet most hangs developers experience are because of locking on SessionState. IReadOnlySessionState is your friend.
I've run into this a lot and ended up changing a lot of the internals of how session state works and have _mostly_ eliminated the issue for us. Granted, you still run into it if you have 2 pages running at the same time, but we see it where sometimes it just doesn't release the state (and it was happening fairly frequently)
http://darrenkopp.com/posts/2013/04/10/Playing-with-fire-Opt...
Re: Automatically diagnose IIS and ASP.NET website hangs
#6Whats this? Something related to .NET on HN front page? I must be dreaming...
Re: Automatically diagnose IIS and ASP.NET website hangs
#7IIS smells NGINX for life!
Re: Automatically diagnose IIS and ASP.NET website hangs
#8Whats this? Something related to .NET on HN front page? I must be dreaming...
We share your sentiment! We are a large-scale startup built entirely on the MSFT stack, in Azure cloud, for the MSFT platform.
People on HN don't often talk about it, but it does happen, and apparently quite a bit judging by our users :)
Re: Automatically diagnose IIS and ASP.NET website hangs
#9In addition, when it comes to hanging on AWS EC2, remember to check your ICMP: http://www.daemonology.net/blog/2012-11-28-broken-EC2-firewa...
Re: Automatically diagnose IIS and ASP.NET website hangs
#10I used to have sporadic hangs when it didn't even look like the request reached the IIS server (hosted on EC2), but I didn't know where to start looking. Any advice on that?