What is the difference between a zero reducer and identity reducer in Hadoop Mapreduce?

0 votes
I'm a newbie to Hadoop and Big Data Ecosystem. I want to know the difference between a zero and an identity reducer. Help needed.
Apr 10, 2018 in Big Data Hadoop by Ashish
• 2,630 points

edited Apr 10, 2018 by Ashish 555 views

1 answer to this question.

Your answer

Your name to display (optional):
Privacy: Your email address will only be used for sending these notifications.
0 votes
A Zero reducer as the name suggests omits the reducing step and the final output is only the map part of MapReduce. It is also known as a Map-only step.

As far as  Identity Reducer is concerned, the input Key, Value pairs are just dumped into the output as it is without any aggregation, except the data is sorted based on the key. Here, shuffle & sort happens except the aggregation. Hence, Identity Reducer is used if you only want to sort the input data from map output.
answered Apr 10, 2018 by kurt_cobain
• 9,260 points

Related Questions In Big Data Hadoop

0 votes
1 answer

What is the difference between Hadoop MapReduce and built-in MapReduce?

Differences are as follows: Hadoop's MR can be ...READ MORE

answered Sep 11, 2018 in Big Data Hadoop by Frankie
• 9,710 points
96 views
0 votes
1 answer

What is the difference between MapReduce and YARN in Hadoop?

MapReduce: MapReduce is an algorithm used to store ...READ MORE

answered Dec 19, 2018 in Big Data Hadoop by Omkar
• 66,910 points
189 views
0 votes
10 answers

What is the difference between Mongodb and Hadoop?

Apart from the similarity that they are ...READ MORE

answered Dec 6, 2018 in Big Data Hadoop by Deeraj
1,993 views
0 votes
1 answer

What is the difference between a Big Data Warehouse and a traditional Data Warehouse?

Hadoop is similar in architecture to MPP data ...READ MORE

answered Aug 9, 2018 in Big Data Hadoop by Frankie
• 9,710 points
52 views
0 votes
1 answer

Hadoop Mapreduce word count Program

Firstly you need to understand the concept ...READ MORE

answered Mar 16, 2018 in Data Analytics by nitinrawat895
• 9,410 points
1,843 views
0 votes
1 answer

hadoop.mapred vs hadoop.mapreduce?

org.apache.hadoop.mapred is the Old API  org.apache.hadoop.mapreduce is the ...READ MORE

answered Mar 16, 2018 in Data Analytics by nitinrawat895
• 9,410 points
159 views
0 votes
10 answers

hadoop fs -put command?

copy command can be used to copy files ...READ MORE

answered Dec 7, 2018 in Big Data Hadoop by Sujay
9,125 views
0 votes
1 answer

Hadoop dfs -ls command?

In your case there is no difference ...READ MORE

answered Mar 16, 2018 in Big Data Hadoop by kurt_cobain
• 9,260 points
656 views
0 votes
2 answers
+2 votes
10 answers

Is there any difference between “hdfs dfs” and “hadoop fs” shell commands?

Yes, there's a difference between hadoop fs and ...READ MORE

answered Dec 7, 2018 in Big Data Hadoop by Kunal
8,018 views

© 2018 Brain4ce Education Solutions Pvt. Ltd. All rights Reserved.
"PMP®","PMI®", "PMI-ACP®" and "PMBOK®" are registered marks of the Project Management Institute, Inc. MongoDB®, Mongo and the leaf logo are the registered trademarks of MongoDB, Inc.