Hi In MapReduce , number of reducers launched is set by property “mapreduce.job.reduces”. And via java API Job#setNumReduceTasks(int tasks).
In your MR job, somewhere in the program they are setting number of reducer task using java API or property. May be you can check the MR job or property file or configuration file which are loading at client. Thanks & Regards Rohith Sharma K S From: Shushant Arora [mailto:shushantaror...@gmail.com] Sent: 21 April 2015 18:26 To: user@hive.apache.org Subject: mapred.reduce.tasks In MapReduce job how reduce tasks numbers are decided ? I haven't override the mapred.reduce.tasks property and its creating ~700 reduce tasks. Thanks
