As cloud computing gains momentum, more mega data centers are constructed or to be constructed. You can find cool videos on how companies like Google, Microsoft build and run their state-of-the-art data centers.
In these data centers, computers/storage/switches are packed and wired inside containers in factory before being shipped to a data center. After hooking up power, networking, and cooling, a container of servers are ready to go. These advances have Read more... (610 words, estimated 2:26 mins reading time)
If you are using, or intend to use, the open source vijava API with Java Web start, you want to read this article carefully.
A community user recently reported an issue in this scenario. His test application was launched via Web Start jnlp. “First, when run a single test thread everything is fine and the VM tasks operate normally. However as soon as we kick off a second test thread while the first test thread Read more... (443 words, estimated 1:46 mins reading time)
I got an interesting question on how to find out WSDL files are used by vSphere Web Services at the VI Java API forum. After some clarification, it turns out the questioner just wanted to know what methods are called, so that the proxy between client and vCenter server can decide whether it should be allowed to go through.
Although a rare use case, but it’s a valid and sophisticated one. In general, you can use vSphere built in feature for security, for example, Read more... (239 words, estimated 57 secs reading time)
After Java 6.0 released in 2006, it’s been 5 years during which Sun Microsystem was sold to Oracle. Today the 7.0 is finally GAed. It includes quite a few changes including small language changes as well as new and improved APIs.
The language changes are mostly small and may not affect you, for example, the switch statement now works with strings. The new try-with-resource statement, which is similar to using statement in C#, helps you with cleaner code, see the difference shown in the following Read more... (323 words, estimated 1:18 mins reading time)
There was recently a question in VMware vSphere Web Service SDK forum regarding gzip compression in vSphere API. I understand where the user came from – some of the SOAP responses could be pretty big. If they can be compressed, performance could be improved and network bandwidth reduced.
The case can be a little tricky. On one hand, compressing big data definitely saves bandwidth; on the other hand, Read more... (353 words, estimated 1:25 mins reading time)
Disclaimer: These are my personal thoughts, and strictly mine.
I missed the big launch of vSphere 5 on July 12 because I was having my vacation. When I came back, I found so many discussions around the vSphere 5 licensing change. It’s understandable that people don’t like changes, especially if the changes may have financial impacts.
Technically, the vRAM pooling simplifies the licensing model, as pointed out by Carter Shanklin. Money wise, Read more... (405 words, estimated 1:37 mins reading time)
I recently spent two weeks on vacation in China. I’d heard dramatic changes there since my last trip several years ago. My trip definitely confirmed these.
The following are several photos I took while visiting different places:
The Shanghai high speed train station, the end of the world longest high speed railway from Beijing. It started operation on Read more... (193 words, 8 images, estimated 46 secs reading time)
Today I got an email from Louis Jia who is a Sr. Development manager at Cisco. He told me that the product his team has been working on had been rebranded as Cisco Data Center Network Manager (DCNM) and is formally released. Congratulations to Louis and team!
I don’t normally cover products from vendors, be it an established company or a startup. But this one is different Read more... (197 words, 1 image, estimated 47 secs reading time)
While everyone can learn and practice programming, it’s hard to find a good software engineer, even harder to find a great one. My definition of a great software engineer is someone who can solve real world problems with software expertise, not someone who can only write code, or someone who can only talk about architecture on paper, or someone who complicates real world problems.
Yes, we can all learn programming related concepts, languages, tools, and etc. But how to use them effectively on a business problem is really a test stone for anyone. It’s important to study textbooks, learn from others; even more so to Read more... (641 words, estimated 2:34 mins reading time)
As software engineers, we most likely have learned the three key characteristics of object oriented programming: inheritance, encapsulation, and polymorphism. Over the years I study and practice OOP, I realized that inheritance is out of date and arguably misleading, therefore should be replaced.
In OOP, inheritance refers to a relationship between two classes in which a subclass inherits the properties and methods of its super class. The term inheritance is not really a good one because Read more... (531 words, estimated 2:07 mins reading time)
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