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Software Development

The Developer/Non-Developer Impedance Mismatch

Most software developers have probably heard of and even had experiences with the object-relational impedance mismatch (often addressed with ORM tools), the object-XML impedance mismatch (often addressed with OXM tools), and even the developer-DBA impedance mismatch. I don’t believe that these impedance mismatches are as difficult as they are sometimes made out to be, but for those wishing to mitigate ...

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Software Development Metrics that Matter

As an industry we do a surprisingly poor job of measuring the work that we do and how well we do it. Outside of a relatively small number of organizations which bought into expensive heavyweight models like CMMI or TSP/PSP (which is all about measuring on a micro-level) or Six Sigma, most of us don’t measure enough, don’t measure the ...

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MapReduce Questions and Answers Part 2

4 Inverting Indexing for Text Retrieval The chapter contains a lot of details about integer numbers encoding and compression. Since these topics are not directly about MapReduce, I made no questions about them. 4.4 Inverting Indexing: Revised Implementation Explain inverting index retrieval algorithm. You may assume that each document fits into the memory. Assume also then there is a huge ...

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MapReduce Questions and Answers Part 1

With all the hype and buzz surrounding NoSQL, I decided to have a look at it. I quickly found that there is not one NoSQL I could learn. Rather, there are various different solutions with different purposes and trade offs. Those various solutions tend to have one thing in common: processing of data in NoSQL storage is usually done using ...

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5′ on IT-Architecture: three laws of good software architecture

The issue with architectural decisions is that they effect the whole system and/or you often need to make them early in the development process. It means a lot effort if you change that decision a couple of months later. From an economic standpoint architectural decisions are often irrevocable. Good architecture is one that allows an architect to make late decisions ...

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Code comments gone wrong

Adding code comments is supposed to be good practice, but here is why it often fails: Code is the single authoritative source of truth in a program! There is no way to ensure that code comments are correct at all times (not always updated as code changes). Comments are written in human language which can be prone to misinterpretation. First ...

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Top 7 Programmers bad habits

1. The All code is crap, except mine, attitude.I have bad news for you buddy, all code is crap. No matter how much effort you put on it, there is always a majority of programmers who are going to think that your code sucks and that they could have done it 10 times better. I have already covered this topic ...

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Code Forensics

How do you know if using code metrics really does help to produce code with fewer bugs. I am convinced they do, but how can I possibly prove it? All projects have historic data. This is usually stored in your bug tracking and source code control tools. We can use the data stored in these systems to perform ‘code forensics’. ...

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