[jira] [Created] (JAMES-4200) ActiveMQ: prevent auto-adjusting usage limits for broker

ouvtam created JAMES-4200:
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             Summary: ActiveMQ: prevent auto-adjusting usage limits for broker
                 Key: JAMES-4200
                 URL: https://issues.apache.org/jira/browse/JAMES-4200
             Project: James Server
          Issue Type: Bug
          Components: Queue
            Reporter: ouvtam


h1. Problem

While investigating JAMES-4192 I noticed the broker setting {{adjustUsageLimits}} that defaults to true. When running an embedded BrokerService in James the BrokerService might increase its memory limit up to 70% of the JVM heap, causing memory drain for James (see code excerpt below).

It would lead to fewer surprises setting {{adjustUsageLimits}} to false.
h1. Details

System usage defaults (org.apache.activemq.broker.BrokerService):

 
{code:java}
public SystemUsage getSystemUsage() {
    try {
        if (systemUsage == null) {

            systemUsage = new SystemUsage("Main", getPersistenceAdapter(), getTempDataStore(), getJobSchedulerStore());
            systemUsage.setExecutor(getExecutor());
            systemUsage.getMemoryUsage().setLimit(1024L * 1024 * 1024 * 1); // 1 GB
            systemUsage.getTempUsage().setLimit(1024L * 1024 * 1024 * 50); // 50 GB
            systemUsage.getStoreUsage().setLimit(1024L * 1024 * 1024 * 100); // 100 GB
            systemUsage.getJobSchedulerUsage().setLimit(1024L * 1024 * 1024 * 50); // 50 GB
            addService(this.systemUsage);
        }
        return systemUsage;
    } catch (IOException e) {
        LOG.error("Cannot create SystemUsage", e);
        throw new RuntimeException("Fatally failed to create SystemUsage" + e.getMessage(), e);
    }
}

...

protected void checkMemorySystemUsageLimits() throws Exception {
    final SystemUsage usage = getSystemUsage();
    long memLimit = usage.getMemoryUsage().getLimit();
    long jvmLimit = Runtime.getRuntime().maxMemory();

    if (memLimit > jvmLimit) {
        final String message = "Memory Usage for the Broker (" + memLimit / (1024 * 1024)
                + "mb) is more than the maximum available for the JVM: " + jvmLimit / (1024 * 1024);

        if (adjustUsageLimits) {
            usage.getMemoryUsage().setPercentOfJvmHeap(70);
            LOG.warn("{} mb - resetting to 70% of maximum available: {}",
                    message, (usage.getMemoryUsage().getLimit() / (1024 * 1024)));
        } else {
            LOG.error(message);
            throw new ConfigurationException(message);
        }
    }
} {code}
 

 

 

 



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