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Jboss 6.0 + PostgreSQL Datasource + security-domain + CallerIdentityLoginModule : Can i set max number of pools?
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created by <a href="http://community.jboss.org/people/panixgr">achill mantzios</a> in <i>IronJacamar</i> - <a href="http://community.jboss.org/message/578289#578289">View the full discussion</a>
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<div class="jive-rendered-content"><div class="jive-rendered-content"><p>Hello and merry Xmas to all.<br/>Being a jboss user (starting from 3.0.3, still deployed in some remote locations) for the the last 10 years,<br/>I have succesfully set up a new test system Jboss 6.0, postgresql 9.0.2, openjdk 1.6, in a process to completely<br/>upgrade all of our application engine software.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>I had an idea, instead of going the old way of creating the postgresql pool with one user (typically : postgres),<br/>to try having personalized connections, which makes debugging, diagnosing a very very easy task.<br/>So i set up <security-domain>postgresqluser</security-domain>, then in login-config.xml i defined <br/><application-policy name="postgresqluser"><br/>    <authentication><br/>      <login-module code="org.jboss.resource.security.CallerIdentityLoginModule" flag="required"><br/>        <module-option name = "managedConnectionFactoryName">jboss.jca:service=XATxCM,name=pgsql</module-option><br/>      </login-module><br/>    </authentication><br/>  </application-policy></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>I set up both jboss and postgresql authenticate against the same LDAP server, and all the magic seemed to work!!</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>As i understand it, one separate pool will be created for each user.<br/>However this is the only unpleasant thing in the whole story.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>I'd like to have a way to restrict the max total pools created, in order to pose a limit in the max total connections to the db.<br/>In other words emulate <max-pool-size> as if we were talking about the normal "OnePool" case.<br/>Is there anything to pose a limit to the number of actual pools created?</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>This is not for use in high traffic web situation (where usually the apps are simple and the number of users large).<br/>This is for a business, with 200 total users, but a big complexity of apps, queries, etc...<br/>I am planning to set up min-pool-size=0, max-pool-size=4 and idle-timeout-minutes=5 minutes.<br/>(maybe more fine tuning on this last one)</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>During the last 10 months, we had on average 100 distinct logged in users par day, and 130 max.<br/>Haven't done yet any research on the definition/estimation of "concurrent" users in the system.<br/>(in order to assess the max number of "simultaneous" connections).</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Anyway, I'd like to ask :<br/>a) if you see any potential risks with this<br/>b)  if there is a way to limit the max numbers of pools (as a means to  limit the max total potential number of connections to the db)<br/>c) My eye fell on <a class="jive-link-external-small" href="http://docs.jboss.org/jbossas/6/JCA_Guide/en-US/html_single/#An_Overview_of_the_JBoss_JCA_Architecture-JBossManagedConnectionPool_MBean" target="_blank">http://docs.jboss.org/jbossas/6/JCA_Guide/en-US/html_single/#An_Overview_of_the_JBoss_JCA_Architecture-JBossManagedConnectionPool_MBean</a><br/>where it suggest that by specifying Criteria=ByNothing means <br/>"all connections are equivalent, usually if adapter supports reauthentication "</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Ideally what would be great is if we could have a total max number of connections, across all users, <br/>and reauthenticating in the already existing connections.<br/>I dont know whether postgresql supports this but it would be cool in general to have.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Thank you for any help!</p></div></div>
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