FAQ
Hi,

The major differences are in s3 file system that has been rewritten in EMR and in Hadoop interactions with S3. Other differences are in detecting various failure conditions.

Outside these it's Apache Hadoop. Here is a list of patches EMR applied on top of 1.0.3 Hadoop
http://docs.amazonwebservices.com/ElasticMapReduce/latest/DeveloperGuide/EnvironmentConfig_AMIHadoopPatches.html

Regards,
Peter


On Sep 9, 2012, at 11:29 AM, "Momina Khan" wrote:

hi all!

could someone please point out key differences between hadoop code and
Amazon's Elastic MapReduce. I am particularly interested in ways that
hadoop code is changed/optimized to run on efficiently EC2.

cheers!
momina

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