Seq No Deprecated API NEW API 1 Release 0.20 Release 1.X and 2.X 2 Interfaces (means you can add a method with default implementation to an abstract class without breaking old implementations of class Abstract classes For Example Mapper and Reducer interfaces in Old API are abstract classes in new API 3 Package org.apache.hadoop.mapred org.apache.hadoop.mapreduce 4 JobConf,the OutputCollector and the Reporter Context Object (allows the user code to communicate with MapReduce System) 5 Both API’s, Key-Value record pairs are pushed to mapper and reducer In addition execution flow can be controlled by run() method 6 Job Control by JobClient class Job class 7 Output file are named as Part-nnnnn Part-m-nnnnn( mapper) , part-r-nnnnn(reducer) 8 ...
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