[jira] [Created] (AMQCPP-510) Consumer leaks memory with checkForDuplicates=true

["Sam Parsons (JIRA)" <ji...@apache.org>]

Sam Parsons created AMQCPP-510:
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             Summary: Consumer leaks memory with checkForDuplicates=true
                 Key: AMQCPP-510
                 URL: https://issues.apache.org/jira/browse/AMQCPP-510
             Project: ActiveMQ C++ Client
          Issue Type: Bug
          Components: CMS Impl
    Affects Versions: 3.7.1, 3.7.0, 3.8.0
         Environment: Linux x86/64 (ubuntu)
            Reporter: Sam Parsons
            Assignee: Timothy Bish


The example application (examples/main.cpp) leaks memory in the consumer. 

To reproduce the problem, add a usleep(100000) after the producer->send, set useTopics = false and numMessages = 2000000.

With the following url, the example application remains on 4% CPU and 15 meg of memory on my development machine: 

"failover:(tcp://localhost:61616)?connection.checkForDuplicates=false" 

Without the "checkForDuplicates=false" the cpu and memory usage grows constantly. I eventually stopped it at 100% CPU and 340 meg of memory. 

Valgrind suggested that the leak was in ConnectionAudit.cpp:100. I added the following debug: 

try { 
  audit = this->impl->destinations.get(destination); 
} catch (NoSuchElementException& ex) { 
  audit.reset(new ActiveMQMessageAudit(auditDepth,auditMaximumProducerNumber)); 
  this->impl->destinations.put(destination, audit); 
  std::cout << "New destination audit: " << destination->toString() 
            << ", size: " << this->impl->destinations.keySet().size() << std::endl; 
} 

...and it prints... 

Sent message #410 from thread 140736021874568 
New destination audit: queue://TEST.FOO, size: 410 
Message #410 Received: Hello world! from thread 140736021874568 
Sent message #411 from thread 140736021874568 
New destination audit: queue://TEST.FOO, size: 411 
Message #411 Received: Hello world! from thread 140736021874568 

So the size of the destinations map keeps increasing. It seems to think every message has a new destination, but this is not the case. It's just the example code in main.cpp which creates the TEST.FOO destination and sends messages to it in a loop. 

I tested 3.7.0, 3.7.1 and 3.8.0 and the problem is in all of these versions. 3.4.4 does not have this problem, but that version does not have duplicates detection so that's probably why.

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