[
https://issues.apache.org/jira/browse/AMQ-6194?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Christopher L. Shannon resolved AMQ-6194.
-----------------------------------------
Resolution: Fixed
Fix Version/s: 5.14.0
> Deleting a temporary queue creates a warning message in the broker
> ------------------------------------------------------------------
>
> Key: AMQ-6194
> URL: https://issues.apache.org/jira/browse/AMQ-6194
> Project: ActiveMQ
> Issue Type: Bug
> Components: Broker, JMS client
> Affects Versions: 5.12.1, 5.13.1
> Reporter: David Dou
> Assignee: Christopher L. Shannon
> Priority: Minor
> Fix For: 5.14.0
>
> Attachments: AMQ6194Test.java
>
>
> When deleting a temporary queue, the ActiveMQ 5.13.1 (and 5.12.2) broker logs
> the following warning message:
> {noformat}
> INFO [ActiveMQ NIO Worker 111] [TempQueue]
> temp-queue://ID:brokerHostname-57582-1455804170203-8569:1:1 on dispose, purge
> of 1 pending messages:
> org.apache.activemq.broker.region.cursors.VMPendingMessageCursor@e0f6196
> WARN [ActiveMQ NIO Worker 111] [Queue]
> temp-queue://ID:brokerHostname-57582-1455804170203-8569:1:1 after purge of 1
> messages, message count stats report: 1
> {noformat}
> The cause of this warning seems to be the publication of a "ghost" message
> when sending a single message on the temporary queue from a transacted
> session, as demonstrated by this test class:
> {code:java}
> import java.text.SimpleDateFormat;
> import java.util.Date;
> import javax.jms.Connection;
> import javax.jms.JMSException;
> import javax.jms.MessageProducer;
> import javax.jms.Session;
> import javax.jms.TemporaryQueue;
> import javax.jms.TextMessage;
> import org.apache.activemq.ActiveMQConnectionFactory;
> public class GhostMessageOnTempQueueWithTransactedSessionDemo {
> public static void main(final String[] args) throws JMSException {
> final ActiveMQConnectionFactory factory = new
> ActiveMQConnectionFactory("tcp://localhost:61616");
> Connection connection = null;
> Session session = null;
> MessageProducer producer = null;
> TemporaryQueue temporaryQueue = null;
> try {
> connection = factory.createConnection();
> connection.start();
> // The session has to be transacted for the second "ghost"
> message to appear (see below).
> session = connection.createSession(true,
> Session.SESSION_TRANSACTED);
> // And the publication has to be on a temporary queue (if the
> temporary queue is created by another process, the second "ghost" message
> still appears).
> temporaryQueue = session.createTemporaryQueue();
> producer = session.createProducer(temporaryQueue);
> final TextMessage textMessage = session.createTextMessage();
> textMessage.setText("GhostMessageDemo@" + new
> SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss,SSSZ").format(new Date()));
> producer.send(textMessage);
> // Here, in ActiveMQ 5.13.1 and 5.12.2, the message was sent but
> cannot be browsed or consumed. It can however be seen in the JMX console with:
> // - EnqueueCount, that was increased by one;
> // - MemoryUsageByteCount (by sending huge messages of different
> size to ensure that it is indeed the real message).
> // In ActiveMQ 5.10.2 (and 5.4.1), it is not sent (even though
> SocketOutputStream.socketWrite is still called through TcpFormat.oneway?).
> session.commit();
> // Here, in ActiveMQ 5.13.1, a "ghost" message was sent
> (EnqueueCount has increased by one again) and the real message is visible and
> can be consumed.
> // If rollback is called instead, the real message stays (and
> cannot be consumed since the "ghost" message is not sent).
> } finally {
> if (producer != null)
> producer.close();
> if (temporaryQueue != null)
> // Here, if there was a consumer on the queue, it would have
> consumed the real message, leaving the "ghost" message that lead to the
> broker warning.
> temporaryQueue.delete();
> if (session != null)
> session.close();
> if (connection != null) {
> connection.stop();
> connection.close();
> }
> }
> }
> }
> {code}
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
