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list of concepts deprecated from Hadoop 2.x

[ Edited ]

Can we summarize the list of concept/items will be deprecated from Hadoop 2.x after 3.0 ?

 

NOTE: I am not looking for new features. I am interested in concept/items to get rid of due to new feature

 

The list starts with
1. Erasure Coding (EC) replaces Replication factor
2. What about HDFS -> Action -> Rebalance?
3. What about Rack awareness?

 

Anything else?