Hadoop and Traditional RDMS


At this point of writing, I am reading the Hadoop the definitive Guide, 3rd Edition from Oreilly. I thought I capture some information down from what I learn.

Here is a summary of the difference between Traditional RDMS and MapReduce

Traditional RDBMS MapReduce
Data size Gigabytes Petabytes
Access Interactive and batch Batch
Updates Read and write many times Write once, read many times
Structure Static schema Dynamic schema
Integrity High Low
Scaling Nonlinear Linear
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