[rabbitmq-discuss] Garbage Collection Problem in Consumer

Tue Feb 2 13:12:23 GMT 2010

Seema,

I think that your performance problem is in piece of code that you dropped,
this dropped code probably are reusing Rabbitmq objects references, and this
guys are going to Old memory and will be collected in different time, this
cause your feeling about "Rabbit object aren't eligible to GC".

Take a look about how you are using Rabbit objects inside your code. Try to
use only the message like a TO.

About republish message, If you are publishing it in the same queue that you
consume, you can just get message, process it and if OK remove it from queue
using ..ask instead publish it in the end of your flow.

I don't saw any performance problems in this piece of code posted here.

On Tue, Feb 2, 2010 at 10:29 AM, Seema Biradar <seemasbiradar at gmail.com>wrote:

> Hi ,
>
> Please find the attached code for Consumer.java.
>
> public class SingleConsumer{
>
>  public static void main(String args[]) {
>
>
>  ConnectionParameters params = new ConnectionParameters();
>
> params.setUsername(janusProperties.getProperty("rabbitmq_userName").trim());
>
> params.setPassword(janusProperties.getProperty("rabbitmq_password").trim());
>             params.setVirtualHost("/");
>             params.setRequestedHeartbeat(0);
>             ConnectionFactory factory = new ConnectionFactory(params);
>             com.rabbitmq.client.Connection connRMQ =
> factory.newConnection(janusProperties.getProperty("rabbitmq_server_ip").trim(),
> Integer.parseInt(janusProperties.getProperty("rabbitmq_server_port").trim()));
>
>
>             Channel channel = connRMQ.createChannel();
>
>             String exchangeName =
> janusProperties.getProperty("rabbitmq_exchangeName").trim();
>             String queueName =
> janusProperties.getProperty("rabbitmq_queueName").trim();
>             String routingKey =
> janusProperties.getProperty("rabbitmq_routingKey").trim();
>
>             QueueingConsumer consumer = new QueueingConsumer(channel);
>
>             channel.basicConsume(queueName, true, consumer);
>            QueueingConsumer.Delivery delivery;
>             while (!runInfinite)
>             {
>                       try {
>
>                      delivery = consumer.nextDelivery();
>
>                          } catch (InterruptedException ie) {
>                     log.debug("Problem in Deliverying the message");
>                     continue;
>                 }
>
>                   /* 1 . Do some operation on the consumed data which will
> take 2 -3 sec of time.
>                       2. if above operation is success than continue to
> receive next data
>                       3. if above operation fails than resend the message
> back to the queue( Consumer acting as Producer) using channel.basicPublish
>
>                   */
>                     channel.basicPublish(exchangeName, routingKey, true,
> false, MessageProperties.PERSISTENT_TEXT_PLAIN, bao.toByteArray());
>
> }
>
> }
>         }
>
> Memory leakage is because of operating on the data which take times. In
> that time the QueueingDelivery objects are created as many as the the
> messages sent by the Producer.
>
> Thanks,
> Seema
> On Tue, Feb 2, 2010 at 5:01 PM, Gustavo Aquino <aquino.gustavo at gmail.com>wrote:
>
>> Seema,
>>
>> You can't control when your GC will run, if you declare this objects into
>> loop and don't are using hash tables or maps to reutilize it, so it will
>> be eligible to GC automatically, because your life cycle over in next loop.
>>
>> Today I have a consumer in Java consuming about 1.000 m/s and never used
>> more than 15Mb and this objects never go throw eden memory, if you don't
>> forward this objects created inside consumer loop, this objects will be
>> automatic eligible for GC but GC don't run immediately you need to wait.
>>
>> Can you post your consumer code ?
>>
>>
>>
>>   On Tue, Feb 2, 2010 at 3:48 AM, Seema Biradar <seemasbiradar at gmail.com>wrote:
>>
>>>   Hi All,
>>>
>>> i tried the rabbit MQ with Producer and Consumer Program.
>>>
>>> in Consumer side i am getting the all the Message, but the following
>>> objects
>>>
>>> com.rabbitmq.client.QueueingConsumer.Delivery
>>> com.rabbitmq.client.Envelop
>>> com.rabbitmq.client.AMQP.BasicProperties
>>>
>>> are created for each message and not garbage collected immediately after
>>> consuming.
>>>
>>> *in Producer.java
>>> *
>>> used basic publish as shown below.
>>>
>>> channel.basicPublish(exchangeName, routingKey, true, false,
>>> MessageProperties.PERSISTENT_TEXT_PLAIN, bao.toByteArray()) ;
>>>
>>>
>>> *Consumer.java
>>> *
>>> channel.basicConsume(queueName, true, consumer);
>>>
>>> with no-acknowledgement *true*.
>>>
>>> Please let me know, how to make the above object eligible for garbage
>>> collection immediately after consuming.
>>> for Consumer program The Heap Memory allocated is more , as this is
>>> performace issue
>>>
>>>
>>> Thanks,
>>> Seema
>>>
>>> _______________________________________________
>>> rabbitmq-discuss mailing list
>>> rabbitmq-discuss at lists.rabbitmq.com
>>> http://lists.rabbitmq.com/cgi-bin/mailman/listinfo/rabbitmq-discuss
>>>
>>>
>>
>
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