Hadoop MapReduce vs MongoDB MapReduce

Question

What are the key differences between Hadoop MR & MongoDB MR, I mean how Hadoop MapR is different from MongoDB MapR?

Answer 1

Hadoop vs MongoDB MR:

1) Hadoop's MR can be written in Java, while MongoDB's is in JavaScript.

2) Hadoop's MR is capable of utilizing all cores, while MongoDB's is single threaded (upto 2.4)

3) Hadoop MR will not be collocated with the data, while Mongo DB's will be collocated.

4) Hadoop MR has millions of engine/hours and can cope with many corner cases with massive size of output, data skews etc

5) There are higher level frameworks like Pig, Hive, Cascading built on top of the Hadoop MR engine.

6) Hadoop MR is mainstream and a lot of community support is available.

Hope this will help!

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