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

[Marcel Å ebek (JIRA)]

Marcel Å ebek created AS7-4975:
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             Summary: 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: Jason Greene


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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