Comments for brettdargan.com http://brettdargan.com/blog Thoughts and rants Sun, 03 Jan 2010 12:24:48 -0600 http://wordpress.org/?v=2.8.1 hourly 1 Comment on Experimental Circuit Breaker Pattern Implementation by admin http://brettdargan.com/blog/2007/12/15/experimental-circuit-breaker-pattern-implementation/comment-page-1/#comment-683 admin Sun, 03 Jan 2010 12:24:48 +0000 http://brettdargan.com/blog/2007/12/15/experimental-circuit-breaker-pattern-implementation/#comment-683 I was in a rush to write it up, hence the warning and the lack of a real supported project. I left out explicit thread safety so you get to choose how much safety and liveness you want/need. The other impl looks ok, but it is lacking in some areas, biggest one for me is: tests and logging. I was in a rush to write it up, hence the warning and the lack of a real supported project.

I left out explicit thread safety so you get to choose how much safety and liveness you want/need.

The other impl looks ok, but it is lacking in some areas, biggest one for me is: tests and logging.

]]> Comment on Experimental Circuit Breaker Pattern Implementation by Converting Strings to Class files in Spring « Unstable Terrain http://brettdargan.com/blog/2007/12/15/experimental-circuit-breaker-pattern-implementation/comment-page-1/#comment-682 Converting Strings to Class files in Spring « Unstable Terrain Thu, 24 Dec 2009 07:32:21 +0000 http://brettdargan.com/blog/2007/12/15/experimental-circuit-breaker-pattern-implementation/#comment-682 [...] neat implementation of the circuit breaker pattern into an app at work. I looked at other implementations but Spiros’ code is the cleanest (and actually threadsafe – a definite [...] [...] neat implementation of the circuit breaker pattern into an app at work. I looked at other implementations but Spiros’ code is the cleanest (and actually threadsafe – a definite [...]

]]> Comment on Query vs. Matrix Params or Path Params by Dorian Taylor http://brettdargan.com/blog/2009/01/16/query-vs-matrix-params/comment-page-1/#comment-676 Dorian Taylor Tue, 11 Aug 2009 22:24:32 +0000 http://brettdargan.com/blog/?p=211#comment-676 Hey, thanks for the shoutout. Hey, thanks for the shoutout.

]]> Comment on JVM Monitoring with SNMP by admin http://brettdargan.com/blog/2005/04/01/jvm-monitoring-with-snmp/comment-page-1/#comment-655 admin Sun, 19 Jul 2009 06:46:58 +0000 http://brettdargan.com/blog/?p=42#comment-655 We have ditched snmp monitoring altogether, it wasn't worth the hassle for our situation. Which was monitoring only, polling every 2-5mins. Besides jvm stats, we had custom application stats that we wanted monitored. These stats were originally available for query by snmp. The snmp manager tools are too much trouble to import a custom mib. Custom Mibs are too much trouble to manage, change etc. (devs need to know too much about it). The snmp managers mostly just shielded rrdtool anyway and forced you to use their crappy UI to edit rrdtool properties. So we bypassed them altogether. Now we have also removed snmp, so all stats are available over http. (Not quite RESTful, but a decent start). When we finally got rid of snmp, it made the adding new metrics really easy, many more devs have been adding them now. Before it was just too costly in time/effort for ppl new to it to work it all out to add new ones. We have ditched snmp monitoring altogether, it wasn’t worth the hassle for our situation. Which was monitoring only, polling every 2-5mins.

Besides jvm stats, we had custom application stats that we wanted monitored. These stats were originally available for query by snmp.
The snmp manager tools are too much trouble to import a custom mib. Custom Mibs are too much trouble to manage, change etc. (devs need to know too much about it).

The snmp managers mostly just shielded rrdtool anyway and forced you to use their crappy UI to edit rrdtool properties. So we bypassed them altogether.
Now we have also removed snmp, so all stats are available over http. (Not quite RESTful, but a decent start).

When we finally got rid of snmp, it made the adding new metrics really easy, many more devs have been adding them now. Before it was just too costly in time/effort for ppl new to it to work it all out to add new ones.

]]> Comment on Why is Performance Monitoring so hard? by Chronicles of a Wandering Mind » Bookmarks for June 29th through July 17th http://brettdargan.com/blog/2009/07/17/why-is-performance-and-monitoring-so-hard/comment-page-1/#comment-653 Chronicles of a Wandering Mind » Bookmarks for June 29th through July 17th Fri, 17 Jul 2009 19:09:48 +0000 http://brettdargan.com/blog/?p=470#comment-653 [...] Why is Performance Monitoring so hard? – brettdargan.com - To keep it simple lets categorize them like this: [...] [...] Why is Performance Monitoring so hard? – brettdargan.com – To keep it simple lets categorize them like this: [...]

]]> Comment on Experimental Circuit Breaker Pattern Implementation by Why is Performance and Monitoring so hard? – brettdargan.com http://brettdargan.com/blog/2007/12/15/experimental-circuit-breaker-pattern-implementation/comment-page-1/#comment-651 Why is Performance and Monitoring so hard? – brettdargan.com Fri, 17 Jul 2009 04:44:02 +0000 http://brettdargan.com/blog/2007/12/15/experimental-circuit-breaker-pattern-implementation/#comment-651 [...] Release It for "Circuit Breaker pattern" and [...] [...] Release It for "Circuit Breaker pattern" and [...]

]]> Comment on JVM Monitoring with SNMP by DDden http://brettdargan.com/blog/2005/04/01/jvm-monitoring-with-snmp/comment-page-1/#comment-650 DDden Thu, 16 Jul 2009 20:04:57 +0000 http://brettdargan.com/blog/?p=42#comment-650 Judging by the below link you cannot poll a MBean using SNMP. http://java.sun.com/developer/technicalArticles/J2SE/jconsole.html Judging by the below link you cannot poll a MBean using SNMP.

http://java.sun.com/developer/technicalArticles/J2SE/jconsole.html

]]> Comment on RESTful Architecture Style Distilled: Joe goes Jeans Shopping – Part One (Online Experiences) by RESTful Architecture Style Distilled: Joe goes Jeans Shopping – Part Two (Realworld Experiences) – brettdargan.com http://brettdargan.com/blog/2009/06/01/restful-architecture-style-distilled-joe-goes-jeans-shopping-part-one-online-experiences/comment-page-1/#comment-633 RESTful Architecture Style Distilled: Joe goes Jeans Shopping – Part Two (Realworld Experiences) – brettdargan.com Wed, 24 Jun 2009 12:27:31 +0000 http://brettdargan.com/blog/?p=451#comment-633 [...] part one for RESTful Architecture Style Distilled: Joe goes Jeans Shopping- Part One (Online Experiences) [...] [...] part one for RESTful Architecture Style Distilled: Joe goes Jeans Shopping- Part One (Online Experiences) [...]

]]> Comment on JVM Monitoring with SNMP by Master Wong http://brettdargan.com/blog/2005/04/01/jvm-monitoring-with-snmp/comment-page-1/#comment-631 Master Wong Mon, 22 Jun 2009 16:02:13 +0000 http://brettdargan.com/blog/?p=42#comment-631 In addition to monitoring JVM, I wonder if I can monitor web server's (say WebLogic\Tomcat) MBeans via SNMP. Anyone done this? I imagine I would need a tool to generate MBean-MIB, but how do I hook NET-SNMP, MBean-MIB and the MBean together? In addition to monitoring JVM, I wonder if I can monitor web server’s (say WebLogic\Tomcat) MBeans via SNMP. Anyone done this? I imagine I would need a tool to generate MBean-MIB, but how do I hook NET-SNMP, MBean-MIB and the MBean together?

]]> Comment on JVM Monitoring with SNMP by Master Wong http://brettdargan.com/blog/2005/04/01/jvm-monitoring-with-snmp/comment-page-1/#comment-630 Master Wong Mon, 22 Jun 2009 15:40:13 +0000 http://brettdargan.com/blog/?p=42#comment-630 Just want to add that I also found this article helpful: Open NMS - JVM Monitoring using SNMP http://www.opennms.org/index.php/JVM_Monitoring_using_SNMP In my snmpd.conf, I added this line: "proxy -v 2c -c public 127.0.0.1:1666 .1.3.6.1.4.1.42". So if I simply do "snmpwalk -v 2c -c public 127.0.0.1 .1", it will include my Tomcat's JVM info. Not it leaves me wondering if I can include multiple JVMs into NET-SNMP... I can specify different port value ("-Dcom.sun.management.snmp.port=xxxx") for each JVM but I am thinking the JVM-MANAGEMENT-MIB's OIDs will collide. May be I can tweak the (top) OID inside JVM-MANAGEMENT-MIB so each JVM has it's own MIB with different OIDs. Just a theory. I also want to add that I tried to write (more like hack) the same SNMP JVM proxy using SNMP4J (snmp4j.org), I had some success but using the NET-SNMP with JVM-MANAGEMENT-MIB is definitely cleaner and require less future maintenance. Just want to add that I also found this article helpful:
Open NMS – JVM Monitoring using SNMP
http://www.opennms.org/index.php/JVM_Monitoring_using_SNMP

In my snmpd.conf, I added this line:
“proxy -v 2c -c public 127.0.0.1:1666 .1.3.6.1.4.1.42″. So if I simply do “snmpwalk -v 2c -c public 127.0.0.1 .1″, it will include my Tomcat’s JVM info.

Not it leaves me wondering if I can include multiple JVMs into NET-SNMP… I can specify different port value (”-Dcom.sun.management.snmp.port=xxxx”) for each JVM but I am thinking the JVM-MANAGEMENT-MIB’s OIDs will collide. May be I can tweak the (top) OID inside JVM-MANAGEMENT-MIB so each JVM has it’s own MIB with different OIDs. Just a theory.

I also want to add that I tried to write (more like hack) the same SNMP JVM proxy using SNMP4J (snmp4j.org), I had some success but using the NET-SNMP with JVM-MANAGEMENT-MIB is definitely cleaner and require less future maintenance.

]]>