The callbacks are in the parent class, Usage. They are used to signal when the Usage is no longer full.
On Fri, Aug 21, 2015 at 1:02 AM, Tim Bain <tb...@alumni.duke.edu> wrote: > I see no references to a Map or to a field called callbacks in > > http://www.grepcode.com/file/repo1.maven.org/maven2/org.apache.activemq/activemq-client/5.11.1/org/apache/activemq/usage/MemoryUsage.java > > Can you give more details of what you're seeing? > On Aug 20, 2015 1:25 PM, "yang.yang.zz" <yang.yang...@outlook.com> wrote: > > > Hi: > > > > When I tested our product wtih ActiveMQ 5.11.1, we observed a high memory > > usage spike in a ActiveMQ broker process. > > > > This broker has 9G memory configured. It's using memoryCursor to cache > > messages. But for each Queue it has a memory limit for 200M. > > > > Then we observed a high memory usage spike during our test. Having got a > > heapdump from this broker. We saw 5.89G live content. But 5.62G is > consumed > > by a single java class called *org.apache.activemq.usage.MemoryUsage*. > > Having looked inside, there is a callbacks List in this class which has > 220 > > million object. > > > > This MemoryUsage instance is monitoring a Queue which has less than 200MB > > content. Does anyone know why this MemoyUsage has such many object in > the > > callbacks List and consumed such a huge amount of memory? > > > > Thanks! > > -Yang > > > > > > > > -- > > View this message in context: > > > http://activemq.2283324.n4.nabble.com/org-apache-activemq-usage-MemoryUsage-consumes-95-of-the-memory-tp4701250.html > > Sent from the ActiveMQ - User mailing list archive at Nabble.com. > > >
