posted 14 years ago
Hadoop is based on a couple research papers published by Google explaining Google's data processing model. So the *conceptual model* can be considered the same. Of course, the details are very different.
To start out, Google's MapReduce programs are generally written in C/C++, while Hadoop's are generally Java-based. Given that both models have evolved separately over the years to target different communities, it shouldn't be surprising that the details are very different. Having said that, Google engineers I've talked to claim that learning Hadoop is relatively easy for them.