Hi Tino,
Tino Schöllhorn wrote:
Hi,
I have a situation where we are running out of PersistenceBrokers (using
1.0.1). We have a web application which so far runs fine - but somehow
some requests are causing the application not to close its PB.
We can see this when we are monitoring the used connections of mysql
which are slowly growing - even if we are using ConnectionPooling. These
connection are on the state SLEEP for quite a long time and seem never
to be closed.
At some point the application runs out of PB (we are using size 100 of
the PB-Pool).
So it seems (quite obviously) that some PBs are not cleanly handled.
Do you have any advice for us finding those leaks?
In current versions there is no PB leak detection. Such a feature will
be part of the next version (or try latest from SVN OJB_1_0_RELEASE branch).
It would be possible to modify your 1.0.1 version to support broker leak
detection. Have a look in latest PBImpl (OJB_1_0_RELEASE branch) and
port the detection part in method PBimpl#setClosed and PBImpl#finalize
to your class.
http://svn.apache.org/viewvc/db/ojb/branches/OJB_1_0_RELEASE/src/java/org/apache/ojb/broker/core/PersistenceBrokerImpl.java?revision=398752&view=markup
Does it do any good when we "tune" mysql that it discards connections
which are quite old (via property "max_timeout")? Is OJB discaring those
PBs whose connections have died ?
If you correctly use the PB instances (lookup PB instance when needed,
close it after use) the connection pool should handle connections in a
correct way.
But if you don't close PB instances after a query, the connection will
still be associated with the PB instance, please see
http://www.mail-archive.com/ojb-user%40db.apache.org/msg15389.html
regards,
Armin
I am glad for any suggestions.
Tino
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