How to increase reducers in Hive

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Hello. I am running a MapReduce job in Hive and I want to increase the number of reducers because I think the process is slow. There's a query plan for this job and I want to increase the number of reducers for each stage. How can I do it?
May 20, 2019 in Big Data Hadoop by Sharma
2,402 views

1 answer to this question.

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By default, only one reducer is assigned for a job at each stage. If you want to increase this, you can mention the number of reducers along with the hive command. Refer to the below command:

$ hive --hiveconf mapred.reduce.tasks=<number of reducers>
answered May 21, 2019 by Lohit

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