I am running a performance test using JMeter for our application and the there is some asynchronous processing in the form of events on an ActiveMQ queue. I want to wait for the ActiveMQ queue to be empty before recording the statistics for my test. Is there a good way to do that?
I have explored the JMS Producer/Consumers in JMeter 2.10 but they consume messages off the queue which is not what I want as it modifies the original flow of the application. Is there a way to monitor the draining of the queue without consuming the messages of ActiveMQ?
I am using ActiveMQ 5.8 and JMeter 2.10
I was able to monitor ActiveMQ using the HTTP Request to poll the ActiveMQ web console and get the state of all the queues in XML format. After that I used XPATH to extract the size of the queue I was interested in. The snapshots below show the configuration which I was finally able to use. The XPATH expression which I used was
/queues/queue[#name='${queueName}']/stats/#size
One additional thing which I has to do was to setup basic HTTP authentication to be able to connect to the ActiveMQ web console.
The MBean solution by Mahesh should also work if JMX is enabled on the server but it is not enabled by default.
I have documented it in detail here
You can get the pending messages in that queue using the MBean
"org.apache.activemq:BrokerName=host1,Type=Queue,Destination=dest1"
attribute: "QueueSize"
After checking once every few seconds and the value being not more than zero, you can start recording the statistics.
You can create a simple Java class that consumes all messages from the queue. JMeter can run it before tests.
Related
My requirement is to clear all the messages from queue before processing the flow or publishing anything in the queue.
We are using rabbitMQ and due to some reason messages are stucked in the queue and because of that we are facing some issue when we are counting the queue based on the messages. so for the next time before processing we have to clear the queue.
Here we have multiple queue like slave1, slave2,slave3 and when api will be triggered in the process section we have to clear the queue.
Kindly suggest how we can do this in mule3.
Mule 3 has a generic AMQP connector. It does not support administrative commands from a specific implementation like RabbitMQ, so you can't use the connector.
You could use RabbitMQ REST API and call it using the HTTP Request connector. See this previous answer to see how to delete queues with Curl, then implement the same request with HTTP Request: https://stackoverflow.com/a/29148299/721855
This issue is related to 2 earlier questions:
How to implement HTTP request/reply when the response comes from a rabbitMQ reply queue using Spring Integration DSL?
How do I find the connection information of a RabbitMQ server that is bound to a SCDF stream deployed on Tanzu (Pivotal/PCF) environment?
As you can see the update for the question 2 above, we can receive the correct response back from the rabbit sink. However, it only works half of the time alternated as round-robin way (success-timeout-success-timeout-...). The outside http app was implemented with Spring Integration showed in question 1 - sending the request to the request rabbit source queue and receiving the response from the response rabbit sink queue. This only happened in PCF environment after we deployed both the outside http app and created the stream (see following POC stream) there. However, it's working locally all the time (NOT alternately). Did we miss anything? Not sure what's the culprit in PCF. Thanks.
rabbitSource: rabbit --queues=rabbitSource | my-processor | rabbitSink: rabbit --routing-key=pocStream.rabbitSink.pocStream
Sounds like you have several instances of your stream in that PCF environment. This way there are more then one (round-robin feels like two) subscribers to the same RabbitMQ queue. Where only one consumer must be for that queue since only initiator of the request waits for reply, but odd (or even) replies go to different consumer of the same queue. I don't place it as an answer, just because it is the best guess what is going on since you don't see a problem locally.
Please, investigate your PCF environment and how does it scale instances for your stream. There also might be some option of SCDF which does scaling for us.
I am trying to create a Subscriber in my Spring Boot Application. My objective is that the publisher will send multiple messages to a topic and I have to get those message and process them .I noticed that the "handleMessage" of both Paho and Apache ActiveMq will process 1 message at a time. Is it possible to make it concurrent??
I have tried the following
Replaced Paho with ActiveMq
Provided concurrency in my listenercontainer
Provided prefetch in my subscribe URL
Please let me know if there is any way to make my MQTT subscriber to take multiple messages concurrently.
Thank You
If you supply your own thread pool you can have the handleMessage method pass the incoming message off to the threadpool to process and then pass the next message off to the pool.
I have a Java API on my server, and I want it to create tasks and add them to Celery via RabbitMQ. I followed the following tutorial, http://www.rabbitmq.com/tutorials/tutorial-two-python.html, where I used java for the client (send.java) and python to receive (receive.py). In receive.py, where the callback method is invoked, I call a method that I've annotated with #celery.task so that the task is added to celery.
I'm wondering how all of this is deployed on a server though, specifically, why there is a receive.py file. Is receive.py a process that must continually run on the server? Is there a way to configure RabbitMQ so that it automatically routes java client tasks to celery?
Thanks!
RabbitMQ is just a message queue. Producers put messages and consumers get them on demand. You can only restrict access for specific queues via RabbitMQ's auth options.
As for deployment: yes, receive.py needs to continuously run. It is Celery's job to do that. See the Workers Guide for info on running a worker.
I read in ActiveMQ page, using JMX we can monitor queues in activemq. How can we get notified if a queue has messages (depth high) or service interval is high in ActiveMQ. Without using any shell scripts in unix environment. Is it possible through Java program? If yes, give me some ideas to get this done.
For a JMX-free approach, you can also use the XML feed served by the activemq console page. The XML feed is hosted at http://ip:port/admin/xml/queues.jsp
This will have tags similar to this for each queue:
<queue name="your queue">
<stats size="0" consumerCount="1" enqueueCount="0" dequeueCount="0"/>
....
</queue>
Just parse this XML in your code and you are good to go.
you can use Java via JMX APIs to periodically poll for queue stats (see this guide)
for the notification approach, you'd need to use advisory messages to monitor messages delivered to a queue (see this guide)
Yes it is possible in Java.
Starting from version 5.8 of ActiveMQ jolokia agent comes embedded. So it is possible for you to get all stats that JMX can pull using HTTP request which will retuen you stats as JSON and then you can check current values and raise Email alert using SMTP if values go beyond threshold you have decided.
Lets say you want to pull Broker stats using Jolokia hit below URL in your browser enter AMQ console username and password which is admin by default
http://servername.com:8161/api/jolokia/read/org.apache.activemq:type=Broker,brokerName=localhost
Or if you dont want to go through all this trouble , You can use ready made Python script which I have created to Monitor AMQ Heap, Queue params and Broker availability.You can take a look , it may help you in developing your custiom script or program
AMQMonitor and Alerting script