Gardella Juan Pablo created NIFI-7034:
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Summary: Connection leak with JMSConsumer and JMSPublisher
Key: NIFI-7034
URL: https://issues.apache.org/jira/browse/NIFI-7034
Project: Apache NiFi
Issue Type: Bug
Components: Extensions
Environment: Discovered against ActiveMQ.
Reporter: Gardella Juan Pablo
JMS connections are not closed in case of a failure. Discovered against
ActiveMQ, but it applies to other JMS servers.
The problem happens when an exception happen and the worker is discarded and
never closed properly. Below the details.
h3. Details
Any exception happening to a ConsumerJMS or PublisherJMS marks the worker as
invalid. After that, the worker is discarded (the worker object reference is
never cleaned). Below the snipped code of the issue:
{code:java|title=AbstractJMSProcessor}
} finally {
//in case of exception during worker's connection (consumer or
publisher),
//an appropriate service is responsible to invalidate the worker.
//if worker is not valid anymore, don't put it back into a pool,
try to rebuild it first, or discard.
//this will be helpful in a situation, when JNDI has changed, or
JMS server is not available
//and reconnection is required.
if (worker == null || !worker.isValid()){
getLogger().debug("Worker is invalid. Will try re-create... ");
final JMSConnectionFactoryProviderDefinition cfProvider =
context.getProperty(CF_SERVICE).asControllerService(JMSConnectionFactoryProviderDefinition.class);
try {
// Safe to cast. Method #buildTargetResource(ProcessContext
context) sets only CachingConnectionFactory
CachingConnectionFactory currentCF =
(CachingConnectionFactory)worker.jmsTemplate.getConnectionFactory();
cfProvider.resetConnectionFactory(currentCF.getTargetConnectionFactory());
worker = buildTargetResource(context);
}catch(Exception e) {
getLogger().error("Failed to rebuild: " + cfProvider);
worker = null;
}
}
{code}
Before discard the worker, it should be cleaned all resources associated with
it. The proper solution is to call {{worker.shutdown()}} and then discard it.
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