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From rokham <somebodyik...@gmail.com>
Subject Re: Tomcat stops responding due to too many requests - using Jackrabbit
Date Thu, 12 Nov 2009 03:27:47 GMT

Note that all these requests are  WRITING  to Jackrabbit. I also just came
across this article, claiming that "Jackrabbit isn’t actually able to handle
concurrent queries well". 

Does this mean I should move away from Jackrabbit?

rokham wrote:
> 
> Hi,
> 
> I've written a web application using Jackrabbit. I have Tomcat as my web
> server and I'm having a strange problem when a large number of requests
> are sent to Tomcat simultaneously. 
> 
> Here's the scenario:
> 
> When I have about 7 people accessing the server and sending about 10-15
> requests at a time, the server starts off very strong and keeps going for
> about 5 minutes (Each of the 7 people sends 3-4 batches of requests over
> those 5 minutes. This means in 5 minutes we have 7 people sending about 50
> requests each. Therefore a total of 350 requests). After the 5 minutes the
> sever slows down and about 2-3 minutes after doing the same routine,
> Tomcat stops responding.
> 
> I was monitoring the system and the CPU was calm and the memory was
> running at about 100 MB. But it's really strange that Tomcat stops
> responding even though the server is not doing anything. And it's not like
> the request has timed out. No error msg or anything is sent back from
> Tomcat.
> 
> I'm using Jackrabbit as my DB and I'm having a really hard time spotting
> the problem. I don't know if I need to tweak tomcat's configs, or
> something in Jackrabbit or is it something with Tomcat and Jackrabbit
> talking to each other, that I need to know about.
> 
> I came across the post below and the line saying It is caused by an in
> accessible data base.  made me wonder if there's a glitch between tomcat
> and jackrabbit.
> http://www.mail-archive.com/tomcat-user@jakarta.apache.org/msg158745.html
> 
> Thank you in advance. Any help is much appreciated, since I need to have
> the system ready in a week.
> 
> 
> 

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