[jboss-jira] [JBoss JIRA] (AS7-4975) XA datasources memory leak

[Jesper Pedersen (JIRA)]

     [ https://issues.jboss.org/browse/AS7-4975?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jesper Pedersen reassigned AS7-4975:
------------------------------------

    Assignee: Tom Jenkinson  (was: Jason Greene)

    
> XA datasources memory leak
> --------------------------
>
>                 Key: AS7-4975
>                 URL: https://issues.jboss.org/browse/AS7-4975
>             Project: Application Server 7
>          Issue Type: Bug
>          Components: Transactions
>    Affects Versions: 7.1.1.Final
>         Environment: Debian stable
> Postgres version: 8.4.11
> jdbc driver version: 9.1-902.jdbc4
> database is assumed to contain a schema named test.
> datasource definition:
>                 <xa-datasource jndi-name="java:/jdbc/test" pool-name="test" enabled="true" use-ccm="false">
>                     <xa-datasource-property name="PortNumber">
>                         5432
>                     </xa-datasource-property>
>                     <xa-datasource-property name="DatabaseName">
>                         ${db.name}
>                     </xa-datasource-property>
>                     <xa-datasource-property name="ServerName">
>                         127.0.0.1
>                     </xa-datasource-property>
>                     <xa-datasource-class>org.postgresql.xa.PGXADataSource</xa-datasource-class>
>                     <driver>postgresql-9.1-902.jdbc4.jar</driver>
>                     <transaction-isolation>TRANSACTION_READ_COMMITTED</transaction-isolation>
>                     <xa-pool>
>                         <is-same-rm-override>false</is-same-rm-override>
>                         <interleaving>false</interleaving>
>                         <pad-xid>false</pad-xid>
>                         <wrap-xa-resource>false</wrap-xa-resource>
>                     </xa-pool>
>                     <security>
>                         <user-name>${db.name}_test</user-name>
>                         <password>${db.name}_test</password>
>                     </security>
>                     <validation>
>                         <validate-on-match>false</validate-on-match>
>                         <background-validation>false</background-validation>
>                     </validation>
>                     <statement>
>                         <share-prepared-statements>false</share-prepared-statements>
>                     </statement>
>                 </xa-datasource>
>            Reporter: Marcel Å ebek
>            Assignee: Tom Jenkinson
>         Attachments: leak.zip
>
>
> I'm experiencing problems with XA datasources on jboss 7 and postgres database. The test application periodically (each 5 seconds) performs several JPA queries. I use @Schedule facility on @Singleton @Startup bean. However, after a few days, the server runs out of memory. Switching to local tx datasources seems to fix the problem. Analysis of heap dump using visualvm gives the following:
> Heap is quite full (~490 MB from 512MB), most space is taken by byte[] (40%, 200MB) and HashMap.Entry (16%, 80MB) objects, so that gives no much information. Computing retained sizes shows that most space (but just ~16MB) is taken by com.arjuna.ats.internal.jta.recovery.arjunacore.XARecoveryModule#1. Further analysis shows that XARecoveryModule._xidScans contains ~8000 entries. The size continuously grows. When the dump is taken before the OOM conditions starts, eg. when the heap is 50% full, the size of this hashmap is ~4000, so it looks like it grows continuously.
> I will attach my example test case.

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