hadoop - the mappers execute sequentially not parallelly -


hello have problem times of executinon of mappers: succeed that: read 2 file inputs :one file per mapper , add property mapred.tasktracker.map.tasks.maximum =1 mapred-site.xml : , work me finale result: 1 file per mapper , 1 mapper per node . problem when master:50030 find mappers (2 mappers 1 execute in master , other in slave) execute sequentially not parallelly why?how fix problem?

according documentation, mapred.tasktracker.map.tasks.maximum set maximum number of map tasks run simultaneously task tracker.

you should set parameter value greater 1.


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