Hadoop is ideal for the following situations:
- Processing lots of unstructured data
- Examples being books, journals, text files, audio and video files.
- Situations where jobs can be easily parallel-ized.
- Situations where you can get your hands on lots of cheap, commodity hardware.
It probably isn't best suited for:
- Intense computing with small data sets.
- In other words, not ideal for running a fibonacci sequence.
- Jobs that can't be parallel-ized very easily.
- Situations where one needs interactive results
- Hadoop is designed for offline processing.
- Probably not a good wholesale replacement for a relational database server.
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