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From Gnanaprakash <>
Subject Re: active mq (message expiration)
Date Mon, 17 Dec 2007 21:11:17 GMT


Are you able to replicate this issue consistently?

If yes, then can you tell me how to simulate this issue.


Suchitha Koneru (sukoneru) wrote:
> Hello Active MQ users/developers , 
>                               Our application uses  non persistent
> embedded broker ,durable subscribers , topic publishers . The active mq
> version is 4.1.1(release version).  There are two topic publishers and
> two durable subscribers respectively.
> In your previous responses, you specified that for durable subscribers
> active mq maintains  a queue of messages (Message Queue). For each of
> the durable subscribers, a queue of references  is maintained , the
> references point to the messages stored in  Message Queue. 
> Are these queues maintained in RAM or on the disk ?
> There is TTL of  5 minutes on all the messages.
> What is the behavior if the messages are not consumed  after 5 minutes
> ? There is JIRA issue  AMQ-1112 (Messages still exist after TTL).   Will
> the messages keep accumulating in the message queue and the
> corresponding references  in the individual queues  ?
> if this is the case will active mq occupy a lot of disk space.?
> The active mq data folder is always around (40.7-40.8 MB). 
> This issue is fixed in  5.0 snap shot, cannot upgrade to snap shot
> version, as Iam not sure how stable it is. We are going into production
> next month.
> Please  let me know, as to what can be done in this regard. Would
> switching to non durable subscribers solve the problem ?
> is there a tool which I can use for  browsing through active mq's
> Message Queues ?
> thanks,
> Suchitha.

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