How do I find my ActiveMQ queue size?

How do I find my ActiveMQ queue size?

How do I find the Size of a Queue

1. Enqueue Count – the total number of messages sent to the queue since the last restart.
2. Dequeue Count – the total number of messages removed from the queue (ack’d by consumer) since last restart.

How many queues can ActiveMQ handle?

There is no arbitrary limit on the number of queues. The only limitation is the resources available to the JVM as each new queue will consume heap memory not just for the messages in the queue but for the queue’s own data-structures.

How do I monitor my ActiveMQ queues?

How can I monitor ActiveMQ

1. JMX and a JMX console such as jConsole.
2. The Web Console.
3. the Advisory Message feature (using JMS messages to monitor the system)
4. The Command Agent; ActiveMQ.Agent topic that you query for status.
5. The Visualisation plug-in.
6. The Statistics plug-in (from 5.3)

What has twice its prefetch limit pending?

A slow consumer is one that has more than twice its configured prefetch limit number of messages pending. Consumers that are unable to cache prefetched messages must set their prefetch to 1. An example of such a consumer is one implemented using a scripting language like Ruby, say, that connects via STOMP.

How do I check my queue size?

queue::size() is used to check whether the size of the associated queue container. This function returns an unsigned int value, i.e the size of the queue container, or the number of elements present in a queue container. This function returns 0 if the queue is empty or having no elements in it.

How do you clean up ActiveMQ?

However, you can manually delete an unused queue of a stopped instance. Log in as administrator into Apache ActiveMQ. Click Manage ActiveMQ broker, then click Queues. Click Delete in the operations column for the queue that you want to delete.

Is ActiveMQ push or pull?

ActiveMQ will push as many messages to the consumer as fast as possible, where they will be queued for processing by an ActiveMQ Session. The maximum number of messages that ActiveMQ will push to a Consumer without the Consumer processing a message is set by the pre-fetch size.

How can I increase my ActiveMQ performance?

ActiveMQ Performance Tuning

1. 1) Do you need persistence? Persistent delivery is about 20 times slower.
2. 2) Use vm:// transport whenever possible.
3. 3) Optimize your protocol.
4. 4) Configure the Prefetch limit (Consumer Performance)
5. 5) Flow Control (Producer Performance)
6. 6) Async sends.
7. 5) Virtual topics.
8. 7) Tune Default Storage.

How do I check my ActiveMQ status?

The following will also work to check if ActiveMQ is up and running: try { ActiveMQConnectionFactory factory = new ActiveMQConnectionFactory(url); // set transport listener so that active MQ start is notified.

How do I know if my queue is full?

Check whether queue is Full – Check ((rear == SIZE-1 && front == 0) || (rear == front-1)). If it is full then display Queue is full. If queue is not full then, check if (rear == SIZE – 1 && front != 0) if it is true then set rear=0 and insert element.

Is ActiveMQ in memory?

The problem is ActiveMQ is consuming memory and it is not getting free after that. It keeps on increasing until we restart ActiveMQ.

How do you delete messages on ActiveMQ?

How to delete specific message from ActiveMQ queue

1. Step 1 – Locate messages. Click on the queue in QueueExplorer to see a list of messages.
2. Step 2 – Delete messages. Click on Delete button in toolbar, pick “Delete” from menu, or just press Delete key.

Why Kafka is better than AMQ?

One key difference is that Kafka allows you to find messages based on their offset (similar to consuming records from a database), whereas ActiveMQ does not. Kafka also supports more advanced features such as access control using ACLs and compression using compression codecs.

How Kafka is better than ActiveMQ?

How do I view ActiveMQ messages?

When you have created a message in a queue, the message is displayed in the list of messages on the Queues tab. You can click a message in the list to display a detailed view of the message properties and message body contents.

How do you find the overflow of a queue?

Overflow and Underflow Conditions

The underflow condition checks if there exists any item before popping from the queue. An empty one cannot be dequeued further. The overflow condition checks if the queue is full (or more memory is available) before enqueueing any element.

What is queue overflow?

About queue overflow
IMS message queues have a limit on the number of messages that they can contain. The IMS Queue Manager can detect when this limit is reached and will respond to this limit by shutting down IMS (UABEND 758). This condition is known as queue overflow .

How can I increase my ActiveMQ heap size?

To increase the heap memory utilized by JMS/ActiveMQ on a Windows BVE:

1. Install the 64bit Java 1.6 JRE from the Oracle web site (Java 6 is a requirement) on the Traverse BVE, if not already present.
2. Stop all Traverse BVE components via the Traverse Service Controller.

How do you clear the queue forcefully in MQ?

The Clear MQ Queue (CLRMQMQ) command deletes all of the messages from a local queue. The command fails if the queue contains uncommitted messages, or if an application has the queue open.

How do I purge topics in ActiveMQ?

How to delete all of the topics in ActiveMQ?

1. Delete all of the files and folders in ACTIVEMQ_HOME\Data.
2. Turn off all persistence.
3. Delete all of the files and folders in the persistence folder.
4. Delete the entire ACTIVEMQ_HOME directory and reinstall it in a different folder.

Why Kafka is faster than MQ?

IBM MQ vs Kafka: Communication Protocol
Kafka is quicker than most traditional message queuing systems. Because messages in Apache Kafka are not erased once the receiving system has read them, it is easier to log events.

What happens when queue is full?

Queue is completely full when rear is at last array position i.e. (MaxSize -1). Now no more elements can be inserted in queue even if the queue has some empty spaces. This is a drawback of simple queues.

Is JMS in memory?

Main difference is that in-memory loses data when the application goes down; JMS queue loses data when the server goes down IF the topic/queue is not persistent.

How do I start Activemq?

Linux

1. Unpack the files. cd /home/user/activemq. tar zxvf activemq-x.x.x-bin.tar.gz.
2. Find the ActiveMQ installation directory and open the bin directory.
3. Open the console and run the following command: ./activemq start.

How do I delete a pending message in ActiveMQ?