franz1981 commented on issue #2730: ARTEMIS-2399 Fix performance degradation 
when there are a lot of subscribers
URL: https://github.com/apache/activemq-artemis/pull/2730#issuecomment-505880494
 
 
   > For the created page reference, we can record the file offset which can be 
used to seek and read file if message is removed by gc. But for the message not 
yet depaged or not committed in a page transaction, how do we read message and 
create reference just according to page number and message number?
   
   I need to look better how paging works to answer on this :)
   Looking just at your question I can tell that we need something like this: 
https://github.com/real-logic/agrona/blob/master/agrona/src/main/java/org/agrona/collections/BiInt2ObjectMap.java
   If we care about memory footprint, but I believe there must be a way to make 
it simpler too

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