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From "james strachan (JIRA)" <>
Subject [jira] Created: (AMQ-791) support spool to disk for non-persistent topic consumers
Date Mon, 03 Jul 2006 18:33:51 GMT
support spool to disk for non-persistent topic consumers

         Key: AMQ-791
     Project: ActiveMQ
        Type: New Feature

  Components: Broker  
    Reporter: james strachan
     Fix For: 4.2

Rather than just blocking when RAM is full we could have a high-water mark where we start
spooling messages to disk if there is not sufficient RAM to hold the messages.

The good thing about this approch is that it avoids blocking the producers when RAM is full;
the downside is that once spooling starts, the producer will be slowed down to the speed of
the disk spooling (as due to RAM exhaustion under steady state, the producer will have to
wait for the message to be spooled to disk so that it can evict it from RAM so that it can
send the next message).

Though the journal is quite fast so the slow down shouldn't be too many orders of magnitude
(and is better than making things appear to 'lock up' while we wait for the slowest consumer
to acknowledge more messages).

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