On Aug 18, 2005, at 12:37 PM, Dain Sundstrom wrote:
ActiveMQ doesn't use HOWL. Hiram wrote a transaction log
customized and tuned for the access patterns of JMS.
Hiram, we have been having a discussion about how the Geronimo disk
footprint grows by 40MB when started up. Can you give Dave, Bruce
and myself some insight on why the logs are the size they are, how
much they can grow, and what attributes are available to configure
this?
Hi Dain,
By default we use 2 x 20 meg journal files.
The logs need to hold a good working set of the in flight persistent
messages that are flowing through the system. It's optimum if
message that was written to the log file is held long enough so that
ack for that message can be written to the log file (basically before
we checkpoint the message to the jdbc store). that allows us to
avoid moving most of the messages that are flowing through the system
to jdbc which is quite slow by comparison.
And since activemq supports moving allot of msg/sec and the message
can be quite large, 2 x 20 meg log files is a quite conservative
setting. Now if your not using JMS at all, I would guess that's too
much!
Regards,
Hiram
Thanks,
-dain
On Aug 18, 2005, at 8:21 AM, Bruce Snyder wrote:
On 8/18/05, Dave Colasurdo <[EMAIL PROTECTED]> wrote:
Hmmm.. The only entries in j2ee-server-plan.xml that seems
relevant is
the HOWLTransactionLog gbean and it specifies the file
var/txlog/howl*.log. Changing/distributing the changed properties
associated with this gBean either have no effect on the
var/activemq/journal/log*.dat or cause the server startup to fail...
However, in the plan system-activemq-plan.xml.. I found the
following
gbean for the journal that seems to define the journal directory
though
have found no properties to control the size of the log-000*.dat
file.
<gbean name="ActiveMQ.journal"
class="org.activemq.store.journal.JournalPersistenceAdapterGBean">
<!--TODO change to ServerInfo -->
<reference
name="serverInfo"><module>org/apache/geronimo/System</
module><type>GBean</type><name>ServerInfo</name></reference>
<attribute name="directory">var/activemq/journal</
attribute>
<attribute name="journalType">default</attribute>
<reference
name="longTermPersistence"><gbean-
name>geronimo.server:j2eeType=JMSPersistence,name=ActiveMQ.jdbc,*</g
bean-name></reference>
</gbean>
Thoughts?
That's to configure ActiveMQ's use of HOWL. Are you referring to log
files in the modules/assembly/target/geronimo-1.0-SNAPSHOT/var/
activemq/journal/log-000.dat
directory named log-00*.dat? If so, then we'll need to consult Hiram
or James about how ActiveMQ uses HOWL and why the journal's are of
this size.
Bruce
--
perl -e 'print unpack("u30","D0G)[EMAIL PROTECTED]&5R\"F)R=6-E+G-N>61E<D
\!G;6%I;\"YC;VT*"
);'
The Castor Project
http://www.castor.org/
Apache Geronimo
http://geronimo.apache.org/
