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From rideallday <...@uvic.ca>
Subject Re: OOM with high KahaDB index time
Date Mon, 15 Feb 2010 18:46:00 GMT

Yes, topics are durable.

Test case:
1. publish messages to queue, let several hundred thousand accumulate.
2. publish topics to queue, let several hundred thousand accumulate
3. begin consuming from queue.
4. begin consuming from topic.

You should see a huge degrade in performance and a bunch of indexing
messages once you start to consume from topic.




rajdavies wrote:
> 
> could you provide a test case ?
> 
> cheers,
> 
> Rob
> On 11 Feb 2010, at 21:41, rideallday wrote:
> 
>>
>> Umm, actually I'm still seeing issues with high Index times for  
>> topics.
>>
>> My test case is:
>>
>> Send a huge amount of messages into the broker. Let several hundred  
>> thousand
>> accumulate. Then start consumers and see how long it takes to drain  
>> the
>> queues and topics.
>>
>> The result is:
>>
>> For queues- excellent. Performance is amazing. A few 1000ms Journal  
>> append
>> messages, but recovery performance exceeds my requirements.
>> For topics- Index updates in the 2-700ms range. This happens every  
>> second or
>> so and locks the consumer, so recovery is extremely slow.
>>
>> This is very similar behaviour to what I saw with Topics and Queues  
>> before
>> Rob applied the fix for cursors in KahaDB.
>>
>> Is it possible that the fix needs to be also applied to topics?
>>
>> I'm using 5.4 snapshot from Feb 1.
>> -- 
>> View this message in context:
>> http://old.nabble.com/OOM-with-high-KahaDB-index-time-tp27217704p27555173.html
>> Sent from the ActiveMQ - User mailing list archive at Nabble.com.
>>
> 
> Rob Davies
> http://twitter.com/rajdavies
> I work here: http://fusesource.com
> My Blog: http://rajdavies.blogspot.com/
> I'm writing this: http://www.manning.com/snyder/
> 
> 
> 
> 
> 
> 
> 

-- 
View this message in context: http://old.nabble.com/OOM-with-high-KahaDB-index-time-tp27217704p27598149.html
Sent from the ActiveMQ - User mailing list archive at Nabble.com.


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