Radek Kraus created AMQ-6891:
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Summary: Duplicated message in JMS transaction, when jdbc
persistence fails
Key: AMQ-6891
URL: https://issues.apache.org/jira/browse/AMQ-6891
Project: ActiveMQ
Issue Type: Bug
Components: Broker
Affects Versions: 5.15.2
Reporter: Radek Kraus
I have following scenario (see attached test case):
# Send 1 message in JMS transaction
# Enable database problem simulation (throw {{SQLException}} in
{{TransactionContext.executeBatch()}} method - the similar situation should
happen, when commit fails)
# Attempt to send 2 messages in one JMS transaction, send operation fails as
is expected (only 1 message is in database from first send operation)
# Disable database problem simulation ({{SQLException}} is not thrown from now)
# Repeat the attempt to send "the same" 2 messages in one JMS transaction,
send operation is successful now, how is expected (3 messages are in database)
# Attempt to receive 3 messages 1, 2, 3, but 5 messages are received 1, 2, 3,
2, 3.
I have suspicion, that problem is in
{{org.apache.activemq.broker.region.Queue}}. It seems that reason is
{{indexOrderedCursorUpdates}} list. The {{Queue.onAdd(MessageContext)}} method
is invoked for each message by {{JDBCMessageStore.addMessage(ConnectionContext,
Message) method}}, which adds {{MessageContext}} into this list. The added
{{MessageContext}} is processed (and removed) in
{{Queue.doPendingCursorAdditions()}} method, which is invoked only from
"afterCommit synchronization" ({{Queue.CursorAddSync.afterCommit()}} method).
But when commit operation fails, then "afterCommit" method is not invoked (but
{{afterRollback}} method is invoked) and {{MessageContext}} entries stays in
{{indexOrderedCursorUpdates}} list.
Personaly I would expect, that some "remove" operation should be done in
{{Queue.CursorAddSync.afterRolback()}} method. Probably the similar operation
should be done in {{Queue.doMessageSend()}} method on place, where
{{Exception}} from "addMessage" is handled in case when JMS transaction is not
used. Or some different "completion" operation should be introduced, because
{{MessageContext}} is only add into the list, but don't removed in case of
failure.
When I tried to register (and use) {{LeaseLockerIOExceptionHandler
}}IOExceptionHandler, the transports was successfully restarted, but my
"client" code was blocked in {{ActiveMQSession.commit()}} method. Is it
expected behavior?
When I tried to add following code into
{{Queue.CursorAddSync.afterRollback()}}, I received only 3 expected messages
(when JMS transaction is used), but it was only blind shot, sorry, because I
don't understand the whole logic here.
{code:java}
@Override
public void afterRollback() throws Exception {
synchronized(indexOrderedCursorUpdates) {
for(int i = indexOrderedCursorUpdates.size() - 1; i >= 0; i--) {
MessageContext mc = indexOrderedCursorUpdates.get(i);
if(mc.message.getMessageId().equals(messageContext.message.getMessageId())) {
indexOrderedCursorUpdates.remove(mc);
if(mc.onCompletion != null) {
mc.onCompletion.run();
}
break;
}
}
}
messageContext.message.decrementReferenceCount();
}
{code}
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