I've setup two applications (servers) running in the same JBoss 4.2.2.GA instance.
One acts as the JMS client while the other is obviously the server. In my test, the
client is simply generating a stream of object messages (about 50-100K per message) to a
queue where that should be persisted by the JMS server to MySQL. A second client, that is
not part of this test, would consume these messages at a later time.
I'm running Messaging 1.4.0.SP3 and I believe that I've fixed all of the
installation problems related to port bindings, remoting, etc. as I am able to send and
receive small numbers of messages between my two applications.
The first production-like test involving thousands of messages crashed the JMS server with
an OutOfMemoryException after only a few hundred messages where sent to the queue. I
increased the max heap size to 160M which, given that the server is simply persisting
messages from one client, seems quite sufficient. That only delayed the error.
I then found that, after several aborted tests, I could not restart the JMS server due to
an OutOfMemory while opening the messaging queue. Apparently, starting the queue
resulted in all of the messages in the database (about 1,500) being loaded into memory.
Setting the FullSize attribute to 100 in my queue's destination fixed this problem (I
am certain that I could have used a larger value. I picked 100 to test whether this
attribute would resolve my problem rather than to optimize future performance).
When I resumed testing, I found that my JMS server again failed with an OutOfMemory
exception. I then tried setting the DownCacheSize attribute to 100 but that didn't
help.
I've since run my JMS server under JProfiler and found what appears to be a problem.
The server presently has 180 JBossObjectMessage instances in memory (I stopped the test
when the server was nearly out of memory) which is substantially higher than the 100 that
I expected when I lowered DownCacheSize.
Each JBossObjectMessage has two references to it. The first is a weak reference from the
SimpleMessageStore . That reference is exactly what I hoped to find. The second
reference is a hard reference via the messageRefs field of the
org.jboss.messaging.core.impl.MessagingQueue class. That field contains a list of
org.jboss.messaging.core.impl.message.SimpleMessageReference that each contain a hard
reference, via their message fields, to the JBossObjectMessage instances.
Should SimpleMessageReference directly reference the message or a key into the
SimpleMessageStore?
What should I try next to resolve this problem?
Should I be setting FullSize and/or DownCacheSize? Documentation for either is rather
lacking right now.
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