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From deen0 <di...@innotech.no>
Subject Re: Persistence From Redo Log Only?
Date Wed, 26 Mar 2008 10:46:45 GMT

I also have the same problem. I am running the latest 5.1-snapshot on Redhat
Enterprise Linux.

After restarting broker, a large number of messages is replayed from the
redo-log. I am using transacted producers/consumers, and there are no
pending messages before the borker restarts.

Now, where are those messages coming from!? Someone please help...



dfrodrig wrote:
> 
> Hello, I have the exact same questions, could someone reply?
> 
> I would like to add the following: I am trying to use a Master Slave
> configuration sitting on top of a SAN in order to provide high
> availability, but the fact is that everytime I stop the master and the
> slave takes over, the entire system is hanging for the time of recovery
> (exactly like described by Marteen). JDBC is way too slow for having
> persistence + high availability, so how could this problem be tackled?  
> 
> Does it mean we cannot rely on Activemq for providing high availability,
> or is it some broker configuration that needs to be addressed? 
> 
> anyone could answer this post? Thanks!
> 
> 
> 
> Maarten Manders wrote:
>> 
>> Hi everybody
>> 
>> I managed to make my ActiveMQ broker persistent - however I'm not quite
>> sure if it's running the way it should. Every time i start up the broker,
>> it writes the following to the log:
>> 
>> INFO  KahaStore                      - Kaha Store using data directory
>> /usr/local/activemq/activemq-data/kr-store/state
>> INFO  AMQPersistenceAdapter          - Active data files: []
>> WARN  AMQPersistenceAdapter          - The ReferenceStore is not valid -
>> recovering ...
>> INFO  KahaStore                      - Kaha Store successfully deleted
>> data directory /usr/local/activemq/activemq-data/kr-store/data
>> INFO  AMQPersistenceAdapter          - Journal Recovery Started from:
>> DataManager:(data-)
>> INFO  KahaStore                      - Kaha Store using data directory
>> /usr/local/activemq/activemq-data/kr-store/data
>> INFO  AMQPersistenceAdapter          - Recovered 310047 operations from
>> redo log in 212.301 seconds.
>> INFO  AMQPersistenceAdapter          - Finished recovering the
>> ReferenceStore
>> 
>> Obviously, recovering from the journal (= redo log, correct?) is quite
>> slow. Shouldn't ActiveMQ recover from the Kaha Reference Store instead?
>> Unfortunately, I'm getting a "The ReferenceStore is not valid" all the
>> time.
>> 
>> Here's my config:
>> 
>>   <broker xmlns="http://activemq.org/config/1.0" brokerName="localhost"
>> persistent="true" useShutdownHook="false"
>> dataDirectory="${activemq.base}/data">
>> 
>>     <!-- The transport connectors ActiveMQ will listen to -->
>>     <transportConnectors>
>>        <transportConnector name="stomp" uri="stomp://localhost:61613"/>
>>     </transportConnectors>
>> 
>>     <!-- Use the following if you wish to configure the journal with JDBC
>> -->
>>     <persistenceAdapter>
>>       <amqPersistenceAdapter directory="${activemq.base}/activemq-data"
>> maxFileLength="32mb"/>
>>     </persistenceAdapter>
>> 
>>   </broker>
>> 
>> 
>> Aside from that, I have some other questions:
>> 
>> 1. Persistent messages that are recovered on startup don't appear in the
>> admin console. However, I'm able to subscribe and receive them, which
>> confuses the console even more and makes it show a negative number in
>> "Number Of Pending Messages". Is this normal or is it related to the
>> fact, that my messages are not properly persisting?
>> 
>> 2. ActiveMQ chokes (it sometimes takes seconds until the messages start
>> arriving), when trying to receive recovered messages after startup (at
>> least for > 100k messages). I guess, that's normal, since it's a lot of
>> messages... is that correct?
>> 
>> 3. What's the useShutdownHook="false" for, which I see in all ActiveMQ
>> conf examples?
>> 
>> Thanks in advance! & Cheers!
>> Maarten
>> 
> 
> 

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