Very nice, Bill. Email notifications when memoty is low will be very useful.
Is there a CPU utilization monitor as well? Scott and I talked some time ago about a heart watch service which will restart the server when the memory is too low or the CPU is pegged for too long. Your work will be of help. Do you have some thoughts what is an appropriate way to restart the server. Not restart the JVM, but just undeploy everything and deploy it again. Ivelin --- Jae Gangemi <[EMAIL PROTECTED]> wrote: > > agreed - i can't wait to start playing w/ it. > > any proposed ETA for 3.2.4? > > -jae > > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] > On Behalf Of Ben > Sabrin > Sent: Tuesday, January 06, 2004 3:00 PM > To: [EMAIL PROTECTED] > Subject: RE: [JBoss-dev] New JBoss Monitoring > services > > > Well done Bill, this is good stuff:) > > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] > On Behalf Of Bill > Burke > Sent: Friday, December 12, 2003 4:24 PM > To: Jboss-Dev; JBoss 2; [EMAIL PROTECTED] > Subject: [JBoss-dev] New JBoss Monitoring services > > This will be released in JBoss 3.2.4, but it is now > available in 3.2 > branch: cvs checkout -r Branch_3_2 jboss-3.2 > > I've also attached some screen shots > > > JBoss Monitoring > > In JBoss 3.2.4, we've implemented some new JMX MBean > monitoring and a > nice GUI around this infrastructure as well as a way > to plug in how > alerts are processed. Why didn't we use the JMX > Gauge and String > monitors that come implemented with the JMX spec? 3 > reasons: > > 1. They are not integrated with our Service > architecture > 2. They have no way of determining which monitors > have sent an alert and > are currently disabled because an alert was reached > 3. They have no way > of reseting an alert > > So, what infrastructure have we built? First let's > look at configuring > a JMX MBean monitor through the plain old > -service.xml interface that > you would to create any MBean. > > All Monitors are MBeans that start a thread to watch > the values of > another MBean's attribute. When a monitoring > threshold is reached, the > MOnitor will send out an MBean Notification to a set > of registered > listeners. Currently in JBoss, the are two types of > listeners, a dumb > Console listener, and an Email listener which will > send out an email > whenever an alert is received. Of course, the > messages are fully > configurable. > > > Numeric Attribute Monitors > The first type of monitor is a > org.jboss.monitor.ThresholdMonitor that > is used to track Numberic MBean attributes. Here is > an example > configuration of a monitor of free available memory. > It will send a JMX > > Notification when free memory goes below one > megabyte. The MBean it is > watching over that has this particular stat is > jboss.system:type=ServerInfo. > > File: FreeMemory_Monitor-service.xml > > <?xml version="1.0" encoding="UTF-8"?> > <server> > <mbean code="org.jboss.monitor.ThresholdMonitor" > name="jboss.monitor:service=FreeMemory"> > <attribute name="MonitorName">FreeMemory > Monitor</attribute> > <attribute > name="ObservedObject">jboss.system:type=ServerInfo</attribute> > <attribute > name="ObservedAttribute">FreeMemory</attribute> > <attribute name="Threshold">1000000</attribute> > <attribute name="CompareTo">1</attribute> > <attribute name="Period">1000</attribute> > <attribute name="Enabled">true</attribute> > <depends-list > optional-attribute-name="AlertListeners"> > > <depends-list-element>jboss.alerts:service=ConsoleAlertListener</depends > -list-element> > > <depends-list-element>jboss.alerts:service=EmailAlertListener</depends-l > ist-element> > </depends-list> > </mbean> > </server> > > Let's walk through each attribute: > > <attribute > name="MonitorName">FreeMemory</attribute> > > The display name in which this monitor will be shown > in the web-console. > > If you create monitors by hand you can have it > managed by the > web-console if you have one monitor defined in one > file only and the > name of the file is the same name as the monitor and > the file lives in > ./deploy/management/monitors/ So The above example > the filename should > be FreeMemory_Monitor-service.xml, notice that > whitespace is substituted > > with an '_' charater. > > > <attribute > name="ObservedObject">jboss.system:type=ServerInfo</attribute> > <attribute > name="ObservedAttribute">FreeMemory</attribute> > > These are the MBean and the MBean attribute this > monitor will watch. If > > the MBean is a ServiceMBean then you should make > this a <depends > optional-attribute> so that this monitor doesn't > start before the > watched MBean is loaded. > > <attribute name="Threshold">1000000</attribute> > <attribute name="CompareTo">1</attribute> > > The Threshold is the value threshold of the > attribute. The CompareTo is > > a numeric value, -1 means > (greater than), 0 means > = (equal), 1 means > (less than). These are the same values used by Java > comparators. So in > > this example, when the FreeMemory attribute is less > than 1000000 a JMX > notification will be sent. > > <attribute name="Period">1000</attribute> > > The MBean creates a thread that will wake up every > so often to check the > > threshold against the MBean attribute it is > watching. The Period is the > > time in milliseconds this thread will sleep. > > > <attribute name="Enabled">true</attribute> > > Enabled determines whether or not this monitor > should actually monitor. > It is the on/off switch of the monitor. > > <depends-list > optional-attribute-name="AlertListeners"> > > <depends-list-element>jboss.alerts:service=ConsoleAlertListener</depends > -list-element> > > <depends-list-element>jboss.alerts:service=EmailAlertListener</depends-l > ist-element> > </depends-list> > > When the threshold is triggered, the Monitor will > send JMX NOtification > > to all registered listeners. For this particular > MOnitor, a Console and > > === message truncated === ------------------------------------------------------- This SF.net email is sponsored by: IBM Linux Tutorials. Become an expert in LINUX or just sharpen your skills. Sign up for IBM's Free Linux Tutorials. Learn everything from the bash shell to sys admin. 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