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HDFS >> mail # user >> what is the difference between mapper and identity mapper, reducer and identity reducer?


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what is the difference between mapper and identity mapper, reducer and identity reducer?
hi  all,

please  tell me what is the difference between mapper and identtiy mapper ,
reducer and identity reducer.

thanks in advance.
NEW: Monitor These Apps!
elasticsearch, apache solr, apache hbase, hadoop, redis, casssandra, amazon cloudwatch, mysql, memcached, apache kafka, apache zookeeper, apache storm, ubuntu, centOS, red hat, debian, puppet labs, java, senseiDB