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From Joe Hansen <joe.hansen...@gmail.com>
Subject Re: java.lang.OutOfMemoryError: Java heap space
Date Sun, 04 Oct 2009 19:45:37 GMT
Rainer, Thank you so much for your kind reply!

I have increased the java heap size to 512MB (-Xms512m -Xmx512m). I am
hoping that would fix the issue. I had configured our webserver to use
Jasig's Central Authentication System (CAS). Recently I increased the
session timeout from 30 minutes to 4 hours. I am guessing that must
have had an impact on the number of tickets that the CAS could store
in the Java's memory space.

I did run the kill -QUIT command against the tomcat process. It did
generate a huge output in the catalina.out file. I am unable to
decipher it. I do not want to post it to the mailing list because its
very long. Would you be able to please tell me what should I be
looking for within this long thread dump?

Thanks again, Rainer :)

Joe

On Sat, Oct 3, 2009 at 12:24 PM, Rainer Jung <rainer.jung@kippdata.de> wrote:
> On 03.10.2009 20:07, Joe Hansen wrote:
>> Hey All,
>>
>> I get this error (java.lang.OutOfMemoryError: Java heap space) after
>> my Apache 2.0/Tomcat 5.5/mod_jk installation has been up and running
>> for a few hours. This problem started just since two days. Never had
>> this issue before!
>>
>> I have also noticed that as soon as I startup the server, 9 httpd
>> processes start. Number of httpd processes keep on increasing until I
>> get the OutOfMemoryError.
>> $ps -aef | grep httpd
>> root     31984     1  0 11:23 ?        00:00:00 /usr/sbin/httpd
>> apache   31987 31984  0 11:23 ?        00:00:00 /usr/sbin/httpd
>> apache   31988 31984  0 11:23 ?        00:00:00 /usr/sbin/httpd
>> apache   31989 31984  0 11:23 ?        00:00:00 /usr/sbin/httpd
>> apache   31990 31984  0 11:23 ?        00:00:00 /usr/sbin/httpd
>> apache   31991 31984  0 11:23 ?        00:00:00 /usr/sbin/httpd
>> apache   31992 31984  0 11:23 ?        00:00:00 /usr/sbin/httpd
>> apache   31993 31984  0 11:23 ?        00:00:00 /usr/sbin/httpd
>> apache   31994 31984  0 11:23 ?        00:00:00 /usr/sbin/httpd
>
> Sounds like requests get stuck or responses are only returned very slowly.
>
> I would take thread dumps during the time requests pile up (e.g. httpd
> process count increases). Thread dumps are generated by "kil -QUIT"
> against the Tomcat process. Result is written to catalina.out. Always
> take afew thread dumps shortly after each other, e.g. 3 dumps each 3
> seconds apart from the previous one, so that you can find out, if a
> status in a dump is pure coincidence or lasts for somewhat longer.
>
>> $ps -aef | grep tomcat
>> root     31949     1 43 11:23 pts/0    00:00:58 /usr/java/jdk/bin/java -Djava.u
>> il.logging.manager=org.apache.juli.ClassLoaderLogManager -Djava.util.logging.co
>> fig.file=/usr/lib/apache-tomcat/conf/logging.properties -Djava.endorsed.dirs=/u
>> r/lib/apache-tomcat/common/endorsed -classpath :/usr/lib/apache-tomcat/bin/boot
>> trap.jar:/usr/lib/apache-tomcat/bin/commons-logging-api.jar -Dcatalina.base=/us
>> /lib/apache-tomcat -Dcatalina.home=/usr/lib/apache-tomcat -Djava.io.tmpdir=/usr
>> lib/apache-tomcat/temp org.apache.catalina.startup.Bootstrap start
>
> There is no Java memory configuration included above (i.e. al defaults).
> It might well be, that you have to explicitely set heap size, perm size
> and if you like also eden and semi spaces.
>
>> Can someone on this list please help me resolve this issue.
>>
>> Thanks you,
>> Joe
>
> Regards,
>
> Rainer
>
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