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Posted to issues@activemq.apache.org by "Christopher L. Shannon (JIRA)" <ji...@apache.org> on 2015/08/24 20:21:46 UTC

[jira] [Commented] (AMQ-5923) Add Pending Message Size Metrics

    [ https://issues.apache.org/jira/browse/AMQ-5923?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14709784#comment-14709784 ] 

Christopher L. Shannon commented on AMQ-5923:
---------------------------------------------

I've made some progress on this with KahaDB.  Working on tests now and also cleaning some things up.  The pending message metrics really only apply to Topic subscriptions (durable and non durable).  For the Queue case nothing really needs to be done here because the pending message count is just the number of messages in the Queue and the pending size would just be the message store size.

> Add Pending Message Size Metrics
> --------------------------------
>
>                 Key: AMQ-5923
>                 URL: https://issues.apache.org/jira/browse/AMQ-5923
>             Project: ActiveMQ
>          Issue Type: New Feature
>          Components: Broker
>            Reporter: Christopher L. Shannon
>            Assignee: Christopher L. Shannon
>             Fix For: 5.13.0
>
>
> Right now the PendingMessageCursor keeps track of the number of pending messages (the size() method).  It would be useful to also report back the total message size besides just the count so we know how much memory or disk space is being used by pending messages. 
> Now that KahaDB is keeping track of the size of each message as of 5.12, it should be possible to report back this value in a non-blocking way.  For a Queue this is pretty straightforward but for DurableSubscriptions some work will need to be done to keep track of the message size for unacked messages for each subscription.



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