What is the purpose of the prefetchExtension counter in
TopicSubscription.java (AMQ 4.2)?  Not sure what is trying to be
accomplished, but one way or another, the way it is implemented / used is
causing the isFull method to never return true.  In fact, PrefetchSize in
jconsole shows an ever increasing number, which is what first attracted my
attention - since PrefetchSize is not something that normally changes once
set.  Since isFull doesn't work, then discarding policies don't work...

There are several methods in TopicSubscription.java that reference
prefetchExtension, and if that counter is ever increasing, as it is right
now, those methods won't work properly.  That would include the previously
mentioned isFull, but also isLowWaterMark, isHighWaterMark.

I can open a JIRA issue, but thought I'd post it here first as a question.
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