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From "Ivan (JIRA)" <j...@apache.org>
Subject [jira] Updated: (GERONIMO-3838) memory (probably related to sessions) leak
Date Tue, 16 Sep 2008 14:52:45 GMT

     [ https://issues.apache.org/jira/browse/GERONIMO-3838?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Ivan updated GERONIMO-3838:
---------------------------

    Attachment: Geronimo-3838.patch

I do some change in the ManagerGBean, so that it can could hander the initialization while
set the className with org.apache.catalina.session.PersistentManager.
For example :
<manager>TomcatManager</manager>           
  <gbean name="TomcatManager" class="org.apache.geronimo.tomcat.ManagerGBean">
    <attribute name="className">org.apache.catalina.session.PersistentManager</attribute>
    <attribute name="initParams">maxActiveSessions=10
    		maxIdleBackup=10
    		maxIdleSwap=11
    		minIdleSwap=5
				store.className=org.apache.catalina.session.FileStore				
				store.checkInterval=10
				store.directory=d:/testFolder/session</attribute>
  </gbean>
We could set store.className=org.apache.catalina.session.JDBCStore to use the JDBCStore.

One thing makes me confusion is that I found the reference name of manager and cluster in
the TomcatWebAppContext.java is changed in the patch GERONIMO-3696 is changed, and it conflicts
with the xml schema file http://geronimo.apache.org/xml/ns/j2ee/web/tomcat-2.0.1. I change
those two reference name back, or it seems that the manager object could not be set. I am
not sure whether I miss something, thanks very much for any comment !


> memory (probably related to sessions) leak
> ------------------------------------------
>
>                 Key: GERONIMO-3838
>                 URL: https://issues.apache.org/jira/browse/GERONIMO-3838
>             Project: Geronimo
>          Issue Type: Bug
>      Security Level: public(Regular issues) 
>          Components: Memory Leaks, Tomcat
>    Affects Versions: 2.0.2, 2.1.1
>         Environment: tested with JDK 1.5 running on Windows XP and FreeBSD6.2
>            Reporter: Radim Kolar
>            Priority: Critical
>             Fix For: 2.2
>
>         Attachments: Geronimo-3838.patch
>
>
> There is memory leak and it can be repeated very easily, so it should be very easy to
catch
> Install Geronimo and then run some kind of benchmarking software against its admin UI
login page, for example
> program ab from Apache HTTP. This is realistic attack scenario, because lot of denial
of service attacks are doing this (requesting one page many times).
> Watching memory used graph in admin console shows free memory slowly decreasing. After
all available memory is exhausted, application server stops serving new requests and never
restores ifself back to working state.
> I think that it is caused by allocating sessions without limiting total number of sessions
to keep in memory and possibly to swap sessions out to file. There needs to be user-configurable
setting for preventing this, it would be nice to add such setting to Admin console.
> Its very important to get this bug fixed.

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