Hello i have i problem with the times of executinon of mappers:
well finally i succeed to do that:
read 2 file inputs :one file per mapper and i add this property
mapred.tasktracker.map.tasks.maximum =1 to mapred-site.xml :
and this work good for me so the finale result:
one file per mapper and one mapper per node .
problem that when i look to master:50030 i find that the mappers (2 mappers one that execute in master and the other in slave) execute sequentially not parallelly why?how i fix this problem?
the mappers execute sequentially not parallelly
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According to documentation,
mapred.tasktracker.map.tasks.maximumset the maximum number of map tasks that will be run simultaneously by a task tracker.You should set this parameter to a value greater than 1.