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From rokham <somebodyik...@gmail.com>
Subject RE: Tomcat stops responding due to too many requests - using Jackrabbit
Date Fri, 13 Nov 2009 04:09:48 GMT

Hi,

Thanks a bunch for your reply. I learned yet another new thing :)

I think my problem lied in my program's usage of sessions accessing
Jackrabbit. I had a single session processing all the requests, but after
reading a lot online, special thanks to this page:

http://n4.nabble.com/Threads-in-jackrabbit-application-td520034.html#a520034

I learned that each thread should have its own session. I made the changes
and the performance shot up very significantly. 

I used to be able to add/update/query Jackrabbit with about 300-500 requests
(over 5 minutes) and it would come to a halt. Now I was able to perform
7,200 operations (over about 40 minutes) and it was still up and running (no
glitches felt). I still need to run longer and harsher tests on the
application but I feel a lot more confident in its performance.

Thanks again for your help,

Rokham





Paul PODGORSEK wrote:
> 
> 
> 
> 
> 
> 
> 
> Hi,
> 
> Have you tried launching your server in debug mode? Can you monitor how
> many threads are running at the same time?
> Could you also send your repository configuration please?
> 
> I have had the same kind of symptoms with one of my apps due to 
> synchronized methods in the AbstractBundlePersistenceManager class (too
> many threads were waiting to acquire a lock). The CPU wasn't used very
> much, as most threads were only waiting for their lock. I finally got
> round this problem by using a second cache level (with ehcache).
> If you indeed have the same kind of issue, you will probably have problems
> because you are often writing in the repository, not only reading. Maybe
> someone else on this mailing list could help you out for that?
> 
> Hope that helps.
> 
> Regards,
> Paul.
> 
>> Date: Wed, 11 Nov 2009 19:27:47 -0800
>> From: somebodyiknow@gmail.com
>> To: users@jackrabbit.apache.org
>> Subject: Re: Tomcat stops responding due to too many requests - using
>> Jackrabbit
>> 
>> 
>> 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.
>> > 
>> > 
>> > 
>> 
>> -- 
>> View this message in context:
>> http://n4.nabble.com/Tomcat-stops-responding-due-to-too-many-requests-using-Jackrabbit-tp605518p612788.html
>> Sent from the Jackrabbit - Users mailing list archive at Nabble.com.
>  		 	   		  
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-- 
View this message in context: http://n4.nabble.com/Tomcat-stops-responding-due-to-too-many-requests-using-Jackrabbit-tp605518p620750.html
Sent from the Jackrabbit - Users mailing list archive at Nabble.com.

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