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In the Cloud, you have to trust your instruments...

Michael Kopp

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Top Stories by Michael Kopp

In a recent article we have shown how the Java Garbage Collection MXBean Counters have changed for the Concurrent Mark-and-Sweep Collector. It now reports all GC runs instead of just major collections. That prompted me to think about what a major GC actually is or what it should be. It is actually quite hard to find any definition of major and minor GCs. This well-known Java Memory Management Whitepaper only mentions  in passing that a full collection is sometimes referred to as major collection. Stop-the-world One of the more popular definitions is that a major GC is a stop-the-world event. While that is true, the reverse is not. It is often forgotten that every single GC, even a minor one, is a stop-the-world event. Young Generation collections are only fast if there is a high mortality rate among young objects. That’s because they copy the few surviving objects an... (more)

How Garbage Collection Differs in the Three Big JVMs

(Note: If you’re interested in WebSphere in a production environment, check out Michael's upcoming webinar with The Bon-Ton Stores) Most articles about Garbage Collection ignore the fact that the Sun Hotspot JVM is not the only game in town. In fact whenever you have to work with either IBM WebSphere or Oracle WebLogic you will run on a different runtime. While the concept of Garbage Collection is the same, the implementation is not and neither are the default settings or how to tune it. This often leads to unexpected problems when running the first load tests or in the worst case... (more)

Cloud Computing: Cloud Expo in NYC is Coming!

Another year and another Cloud Expo in New York. This year I will be giving two different presentations. The first is on Application Performance Monitoring in the Clouds. In this talk I will cover the five top lessons we have learned about performance and cloud applications. The second is about Performance Management in ‘Big Data' Applications. Most articles that I found on performance and Big Data are about the performance options on the Big Data product itself, but tend to be pretty light on the application itself. In this talk I will cover the two sides of BigData (Hadoop Ma... (more)

Lessons Learned from Real-World Big Data Implementations

In the past few weeks I visited several Cloud and Big Data conferences that provided me with a lot of insight. Some people only consider the technology side of Big Data technologies like Hadoop or Cassandra. The real driver however is a different one. Business analysts have discovered Big Data technologies as a way to leverage tons of existing data and ask questions about customer behavior and all sorts relationships to drive business strategy. By doing that they are pushing their IT departments to run ever bigger Hadoop environments and ever faster real-time systems. What's int... (more)

NoSQL or Traditional Database

Traditional Enterprise Database vendors often bring up the lack of professional monitoring and management tool support for NoSQL solutions. Their argument is that enterprise applications require sophisticated tuning and monitoring of the database in order to ensure a performant and smooth operation. NoSQL Vendors, while arguing that this lack is not enough to favor RDBMS over their respective solutions, do agree. Several vendors try to differentiate themselves by providing enterprise level monitoring and management software, for example, Cassandra, MongoDB, HBase or others. Both ... (more)