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From "Peter Blackburn (JIRA)" <>
Subject [jira] Created: (AMQ-2922) Add ability for KahaDB log files to be created on a per-destination basis.
Date Thu, 16 Sep 2010 12:41:40 GMT
Add ability for KahaDB log files to be created on a per-destination basis.

                 Key: AMQ-2922
             Project: ActiveMQ
          Issue Type: New Feature
          Components: Message Store
    Affects Versions: 5.4.0
         Environment: All
            Reporter: Peter Blackburn

KahaDB persistence uses rolling log files to store unconsumed messages. These are named db-1.log,
db-2.log ... db3.log. At present these files contain messages for all destinations managed
by the broker.

A configurable option could be added that would allow these files to be created on a per-destination
basis. For example, if the broker contained two queue destinations, queue_1 and queue_2, the
log files would become:

queue_1-1.log, queue_1-2.log....etc
queue_2-1.log, queue_2-2.log....etc

Each set of log files would only contain messages for the relevant destination. 

This would help in the following situation:

queue_1: receives one message every 15 seconds or so. These messages remain unconsumed for
several hours.
queue_2: receives thousands of messages per second. These messages are consumed as they arrive.

At present, the scenario above leads to each log files containing a few messages that have
yet to be consumed and thousands of messages that have been consumed, but the log file cannot
be deleted until all messages logged in it have been consumed (which may be hours later).

Logging on a per-destination basis would allow the log files for queue_2 in the above example
to be deleted, meaning the unconsumed messages on queue_1 take up far less disk space. This
would also reduce the number of file handles required.

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