[Performance Tuning] - Help getting rid of a memory leak
by Angelo Marletta
Angelo Marletta [http://community.jboss.org/people/JohnnyStrozzino] created the discussion
"Help getting rid of a memory leak"
To view the discussion, visit: http://community.jboss.org/message/555304#555304
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Hello everybody,
I've recently encountered some problems with memory leaks on JBoss, and even after having googled a lot, I still cannot manage to solve them.
My application has several EJB3 web services and handles about 100k soap requests per day. Each request involves reading/writing Oracle db, using JPA and EJB3 over Hibernate. But after 10 days of production it runs out of memory and I must restart the application server. The application is normally deployed on a 4 nodes cluster.
So I followed this strategy:
1) Run only 1 cluster node, for 4 days
2) GC and get an head dump every morning
3) Compare the head dumps with Eclipse Memory Analyzer in order to understand what's growing
I found out that there is an instance of class org.jboss.classloader.spi.base.BaseClassLoader which after 1 day is retaining 81 MB of memory, after 2 days 168 MB, after 3 days 245 MB. This object has a java.util.concurrent.ConcurrentHashMap called "blacklist" which actually is responsible for almost all the used memory (respectively 70 MB, 157 MB, 234 MB) of the container object.
This blacklist is a ConcurrentHashMap<String,String> with each key equals to its value. The latest snapshot contains over 1 million of Strings.
All Strings objects inside the map seem to appear in the following format: $obj$XXXXXXXX/E1/E2/.../En.class
where [XXXXXXXX] is an hexadecimal number, and [E1]...[En] are names of application JPA entities, sorted in a way thet reflects the real relationship order. For instance, entity E1 has a reference to entity E2, which has a reference to entity E3, and so on.
Some info about my setup:
Max heap size: 1.2 GB
JBoss 5.1.0-GA updated with JBoss EJB3 Plugin 1.0.19
Quartz 1.8.3 in cluster configuration
Hot deployment disabled
Oracle Driver: 11g
JDK and JRE 1.5 (latest) 32 bit
CentOS Linux 5.3
Any hint to help me figure out what's wrong in my code, or in my configuration is very welcome.
In attach there are three screenshots taken in different days.
Thank you
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15 years, 8 months
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[JBoss Cache] - How to model data to be stored in JBoss Cache
by Sanjit Mohanty
Sanjit Mohanty [http://community.jboss.org/people/sanjit...] created the discussion
"How to model data to be stored in JBoss Cache"
To view the discussion, visit: http://community.jboss.org/message/555300#555300
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Hi,
I understand JBoss cache internally stores data in a map i.e. in a key-value pair.
So, incase i need to search for a data in the cache, i need to pass the key and i can retrieve the value.
But what if, i need to retrieve key based on value!
To clarify more on this, following is an example:
Consider i want to store empId, deptId in JBoss cache.
empId = unique employee ID
deptId = department ID. A particular employee can be associated to multiple departments.
I want to do following 2 things:
(1) Get the deptIds based on an empId
(2) Get the empIds based on a deptId
Now, if i make empId as key & store deptId as it's value, then i can achieve (1) without any issues but it will be a problem for (2) because i need to do a full traversal of values, which is in-efficient!
How should i model my data in this scenario?
Thanks In advance!
_Sanjit
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Re: [jboss-user] [JNDI and Naming] - How to Change DefaultDS in jndi-name
by jaikiran pai
jaikiran pai [http://community.jboss.org/people/jaikiran] replied to the discussion
"How to Change DefaultDS in jndi-name"
To view the discussion, visit: http://community.jboss.org/message/555293#555293
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> Dinesh Nadeera wrote:
>
>
> +<datasources>
> <local-tx-datasource>
> <jndi-name>mySource</jndi-name>
> <use-java-context>false</use-java-context>
>
You are using use-java-context = false, which means that the datasource will not be bound to the java: namespace.
So in your persistence.xml, change this:
> Dinesh Nadeera wrote:
>
>
> <jta-data-source>java:/mySource</jta-data-source>
to:
<jta-data-source>mySource</jta-data-source>
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