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From: Josh Carlson <jcarlson@e-dialog.com>
To: "users@activemq.apache.org" <users@activemq.apache.org>
Date: Tue, 9 Nov 2010 16:41:03 -0500
Subject: RE: storeUsage with kahaDB which files
Thread-Topic: storeUsage with kahaDB which files
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Thanks for the quick response Bruce we must be hitting the 5.3 bug where th=
e persisted messages are not being cleaned up because those messages don't =
exist in the queues.

While on the topic of the systemUsage thresholds. Can you or someone else d=
escribe what the memoryUsage limit refers to. I have read two descriptions,=
 one here: http://activemq.apache.org/javalangoutofmemory.html that says it=
 is used to control how much memory is used before non-persistent messages =
are spooled to disk. However, we are persisting all messages but yet in the=
 web console that "Memory percent used" is non-zero. In another document wh=
ich I purchased from Total Transaction Management it says that this limits =
the amount of memory the broker can use. However, this confuses me as well =
because we had it set to 20 MB which doesn't seem like it would be nearly e=
nough and I have seen the JVM well more than a GB.

Thanks for the help


> -----Original Message-----
> From: Bruce Snyder [mailto:bruce.snyder@gmail.com]
> Sent: Tuesday, November 09, 2010 1:41 PM
> To: users@activemq.apache.org
> Subject: Re: storeUsage with kahaDB which files
>=20
> On Tue, Nov 9, 2010 at 10:24 AM, Josh Carlson <jcarlson@e-dialog.com>
> wrote:
> > We running the activemq broker version 5.3.0 and using the STOMP client=
s
> for producers and consumers. We ran into this morning where the store usa=
ge
> had been exceeded and producers were blocked on the sends. I noticed that
> we had the following configured for systemUsage:
> >
> > =A0 =A0 =A0 <systemUsage>
> > =A0 =A0 =A0 =A0 =A0 =A0<systemUsage>
> > =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0<memoryUsage>
> > =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0<memoryUsage limit=3D"20 mb"/>
> > =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0</memoryUsage>
> > =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0<storeUsage>
> > =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0<storeUsage limit=3D"1 gb" name=
=3D"foo"/>
> > =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0</storeUsage>
> > =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0<tempUsage>
> > =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0<tempUsage limit=3D"100 mb"/>
> > =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0</tempUsage>
> > =A0 =A0 =A0 =A0 =A0 =A0</systemUsage>
> > =A0 =A0 =A0 =A0</systemUsage>
> >
> > I solved the problem simply by increasing the storeUsage and restarting=
.
> But what I'm wondering is what constitutes the store and thus what file(s=
)
> are being counted against this threshold. I noted that the root of the da=
ta
> directory is close to 1 GB. Is it counting the whole directory?
>=20
> Yes, correct.
>=20
> > In this directory I see the files db.data, db.redo, a lock file, and
> several db-N.log files. What are the .log files? From:
> http://activemq.apache.org/kahadb.html it sounds like they might be the
> 'message data logs'. Are =A0these the actual persisted messages?
>=20
> Yes, the .log files are the actual persisted messages.
>=20
> > Does the fact that I have some old .log files (from Augest) mean I have
> some abandoned messages?
>=20
> I don't know if you have abandoned messages, but I can tell you that
> there was a bug that prevented the .log files from being cleaned up
> appropriately. This bug was just fixed recently. Currently we are
> discussing a release very soon (5.4.2) that will include this fix.
>=20
> Bruce
> --
> perl -e 'print unpack("u30","D0G)U8V4\@4VYY9&5R\"F)R=3D6-E+G-
> N>61E<D\!G;6%I;\"YC;VT*"
> );'
>=20
> ActiveMQ in Action: http://bit.ly/2je6cQ
> Blog: http://bruceblog.org/
> Twitter: http://twitter.com/brucesnyder