The MemoryUsagePercentage stat is a little tricky. The numerator is
the amount of memory messages take up (and only messages), the
denominator is the fixed memory limit value set in your config.
Neither are directly related to heap size. The threshold and space
values used in waitForSpace() are the two values reported in
MemoryPercentageUsed, not the heap value, so it should be near 100%
when you block.
Could it be that the message that it's blocking on is very large?
What happens if you try a queue instead of a topic (not as a
workaround, just to debug)? Could you be looking at usage manger info
for a specific topic, when other topics are also active and filling
up space?
John
On Dec 21, 2006, at 7:30 AM, stevec wrote:
What stats should I be looking at? (from Broker info:)
MemoryUsagePercentage is never at 100%. Again, if my MemoryLimit
is 20MB,
MemoryUsagePercentage=50% (about 10MB used). If my MemoryLimit is
100MB,
MemoryUsagePercentage=10% (about 10MB used).
Non persistence, Non Durable. I know slow consumers can cause
problems, but
doesnt UsageManager.waitForSpace mean we have a memory issue? If
it is a
memory issue, what other stats should I be looking at for memory
consumption?
James.Strachan wrote:
It does sound like its full. What are the stats from jconsole?
BTW when things are blocked you've typically got a slow consumer.
On 12/21/06, stevec <[EMAIL PROTECTED]> wrote:
ActiveMQ is blocking on UsageManager.waitForSpace. Originally I
had set
the
Broker MemoryLimit to 20MB and I noticed in jconsole when it
failed, that
the memorypercentageused was almost 50%. I then decided to
increase that
number to 100MB. ActiveMQ blocked again (failing), i
investigated the
new
memorypercentageused and it was at 10%. So it seems that the
UsageManager
is failing at about 10MB?
What would cause the UsageManager to block when the memorylimit
is at
100MB
and the memorypercentageused is only 10%? See callstack:
Name: Thread-1
State: WAITING on [EMAIL PROTECTED]
Total blocked: 211,303 Total waited: 370,008
Stack trace:
java.lang.Object.wait(Native Method)
java.lang.Object.wait(Object.java:485)
org.apache.activemq.memory.UsageManager.waitForSpace
(UsageManager.java:91)
org.apache.activemq.broker.region.Topic.send(Topic.java:239)
org.apache.activemq.broker.region.AbstractRegion.send
(AbstractRegion.java:292)
org.apache.activemq.broker.region.RegionBroker.send
(RegionBroker.java:380)
org.apache.activemq.broker.TransactionBroker.send
(TransactionBroker.java:193)
org.apache.activemq.broker.BrokerFilter.send(BrokerFilter.java:126)
org.apache.activemq.broker.CompositeDestinationBroker.send
(CompositeDestinationBroker.java:98)
org.apache.activemq.broker.MutableBrokerFilter.send
(MutableBrokerFilter.java:136)
org.apache.activemq.broker.AbstractConnection.processMessage
(AbstractConnection.java:434)
org.apache.activemq.command.ActiveMQMessage.visit
(ActiveMQMessage.java:604)
org.apache.activemq.broker.AbstractConnection.service
(AbstractConnection.java:238)
org.apache.activemq.broker.TransportConnection$1.onCommand
(TransportConnection.java:63)
org.apache.activemq.transport.ResponseCorrelator.onCommand
(ResponseCorrelator.java:95)
org.apache.activemq.transport.TransportFilter.onCommand
(TransportFilter.java:65)
org.apache.activemq.transport.vm.VMTransport.syncOneWay
(VMTransport.java:96)
org.apache.activemq.transport.vm.VMTransport.oneway
(VMTransport.java:83)
org.apache.activemq.transport.MutexTransport.oneway
(MutexTransport.java:43)
- locked [EMAIL PROTECTED]
org.apache.activemq.transport.ResponseCorrelator.oneway
(ResponseCorrelator.java:60)
org.apache.activemq.ActiveMQConnection.asyncSendPacket
(ActiveMQConnection.java:1126)
org.apache.activemq.ActiveMQSession.send(ActiveMQSession.java:1546)
org.apache.activemq.ActiveMQMessageProducer.send
(ActiveMQMessageProducer.java:465)
org.apache.activemq.ActiveMQMessageProducer.send
(ActiveMQMessageProducer.java:415)
org.apache.activemq.ActiveMQTopicPublisher.publish
(ActiveMQTopicPublisher.java:177)
..... my app is trying to publish to a topic ..........
--
View this message in context:
http://www.nabble.com/blocking-on-UsageManager.waitForSpace-
tf2865932.html#a8009086
Sent from the ActiveMQ - User mailing list archive at Nabble.com.
--
James
-------
http://radio.weblogs.com/0112098/
--
View this message in context: http://www.nabble.com/blocking-on-
UsageManager.waitForSpace-tf2865932.html#a8009707
Sent from the ActiveMQ - User mailing list archive at Nabble.com.
