![]() Other Spooling Messages to Diskįast dispatch of messages is only possible when messages are stored in memory. ![]() A producer may notice the effect of memory limit enforcement by the broker in the form of blocking. Unless message size exceeds resource limits, a producer should not run out of memory. Reducing the prefetch value will reduce the amount of messages queued/stored in memory on the Consumer. ConsumerĪlong with message size, the prefetch limit is main reason a consumer will run out of memory. E.g., the total amount of destination memory limits placed cannot exceed the memory limit of the broker. The memory in ActiveMQ works in a tiered fashion that flows from the JVM -> Broker -> broker features. This is where you need to understand the systemUsage memory limit and the per destination memory limit. That is, the broker does not just simply use up all of the memory in the JVM and then die with an OutOfMemory exception. Although the broker is constrained by the amount of memory given to the JVM, the broker manages its memory independently. ![]() The memory that the broker is allowed to use is not determined by the amount of memory allocated to the JVM. If you are running an embedded broker or in a third party container, ensure that the hosting JVM has appropriate values for the maximum heap and stack sizes. -Xss: If you have massive numbers of threads in the Broker JVM, consider reducing the default JVM stack size of each thread with the -Xss option.Thread stacks and the JMVs internal classes will consume additional memory. Note that the JVM will require more memory than the -Xmx value. -Xmx: If your OS has more available memory, consider increasing the total heap memory available to the broker JVM.Note the default JVM heap size option that is passed to the Java executable by the script (the exact options may depend upon the JVM that you are using, the examples are for the Sun JVM). Try running the broker in a standalone JVM using bin/activemq. This entry refers to ActiveMQ versions 5.1.x and greater. Is it the JVM, the broker, the consumers or the producers? The first thing to determine is what part of the system is running out of memory. It is possible to configure just about all of the memory utilisation of ActiveMQ.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |