Hello ! I have some questions about ActiveMQ memory usage... First, let me explain what happened.
I have some queues (10+) which need to process thousands of messages every day. The option *"flow producer control" is enabled* for every queue. All my messages are *persistent *messages. One day in my production environment my consumers weren't consuming messages anymore while my queues were getting more messages from their producers. I tried to restart my consumers: no effect. Restart of ActiveMQ : no effect. I noticed that the value of *"Memory percent used" was over 100* (something like 160). Then I have allocated more memory to my VM and to my broker : it worked, my consumers were consuming again. My questions are the following : 1/ What I understood is that the memory used by ActiveMQ is linked to the number of messages which are held in memory prior to be pushed to the consumers. Is that right ? If no, how is it managed? 2/ For instance, if I have a prefetch size set to 100 in the consumer side, so at most 100 mesasges will be in memory on the queue side? If no, how is it managed? 3/ How can I reach "Memory percent used : 160" ? The documentation I read about this didn't really help me... Is it because, for instance, if I have 10 queue, each queue needs 160MB in memory while my JVM is only 1GB? 4/ If I set the "memoryLimit" attribute on the policyEntry element for a queue, I guess the queue will not consume more than the amount of memory I have set. What if a message bigger than the memoryLimit comes in the queue? Thanks a lot for your answers. Have a good day. -- Sent from: http://activemq.2283324.n4.nabble.com/ActiveMQ-User-f2341805.html
