Determining how many mappers will run?

0 votes
My Hadoop cluster’s HDFS block size is 64MB. I have a directory containing 100 plain text files, each of which is 100MB in size. The InputFormat for my job is TextInputFormat. Is there any way to determine how many Mappers will run in this case?

Can someone please help?

Thanks in advanace!
Aug 8, 2018 in Big Data Hadoop by Meci Matt
• 9,460 points
203 views

1 answer to this question.

0 votes
Here what happens is, each file would be split into two as the block size (64 MB) is less than the file size (100 MB), so 200 mappers would be running.
answered Aug 8, 2018 by nitinrawat895
• 10,840 points

Related Questions In Big Data Hadoop

0 votes
1 answer

If there are two joins in hive, how many mapreduce jobs will run?

There are two conditions for no. of ...READ MORE

answered Dec 19, 2018 in Big Data Hadoop by Omkar
• 68,840 points
324 views
–1 vote
1 answer

How many FSimage files will be created in hard disk?

In Hdfs, data and metadata are decoupled. ...READ MORE

answered Dec 20, 2018 in Big Data Hadoop by Omkar
• 68,840 points
144 views
0 votes
0 answers
0 votes
0 answers

How to run Hadoop in Docker containers?

I want to incorporate Hadoop in Docker ...READ MORE

Mar 16, 2018 in Big Data Hadoop by nitinrawat895
• 10,840 points
114 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
• 9,290 points
1,433 views
+1 vote
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
• 10,840 points
3,832 views
0 votes
1 answer

How to get started with Hadoop?

Well, hadoop is actually a framework that ...READ MORE

answered Mar 21, 2018 in Big Data Hadoop by coldcode
• 2,050 points
130 views
+1 vote
11 answers

hadoop fs -put command?

put syntax: put <localSrc> <dest> copy syntax: copyFr ...READ MORE

answered Dec 7, 2018 in Big Data Hadoop by Aditya
20,277 views
0 votes
7 answers

How to run a jar file in hadoop?

I used this command to run my ...READ MORE

answered Dec 10, 2018 in Big Data Hadoop by Dasinto
7,042 views
0 votes
1 answer

How will the Fair Scheduler handle more than one Job?

In your case when job B gets ...READ MORE

answered Aug 16, 2018 in Big Data Hadoop by nitinrawat895
• 10,840 points
62 views