How a client reads a file from HDFS

0 votes
I am new to Hadoop and what I've done is I copied a file from my local system to HDFS. Now, I am reading this file from HDFS to process the data using MapReduce. Can someone tell me that how a client reads a file from HDFS.
Jul 31, 2018 in Big Data Hadoop by Shubham
• 13,490 points
1,671 views

1 answer to this question.

0 votes
Let me explain you it briefly. So, what happens is that the Client communication to HDFS happens using Hadoop HDFS API. Client applications talk to the NameNode whenever they wish to locate a file, or when they want to add/copy/move/delete a file on HDFS. The NameNode responds the successful requests by returning a list of relevant DataNode servers where the data lives. Client applications can talk directly to a DataNode, once the NameNode has provided the location of the data.

Hope this helps!
answered Jul 31, 2018 by nitinrawat895
• 11,380 points

Related Questions In Big Data Hadoop

0 votes
1 answer

How to delete a file from Hadoop hdfs using java?

Try this: FileSystem fs = FileSystem.get(getConf()); fs.delete(new ...READ MORE

answered Nov 28, 2018 in Big Data Hadoop by Omkar
• 69,210 points
4,389 views
0 votes
1 answer

How to create a Hive table from sequence file stored in HDFS?

There are two SerDe for SequenceFile as ...READ MORE

answered Dec 18, 2018 in Big Data Hadoop by Omkar
• 69,210 points
3,447 views
0 votes
1 answer

How to print the content of a file in console present in HDFS?

Yes, you can use hdfs dfs command ...READ MORE

answered Apr 19, 2018 in Big Data Hadoop by Shubham
• 13,490 points
4,073 views
0 votes
1 answer

How to count lines in a file on hdfs command?

Use the below commands: Total number of files: hadoop ...READ MORE

answered Aug 10, 2018 in Big Data Hadoop by Neha
• 6,300 points
19,803 views
–1 vote
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
• 9,390 points
3,406 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
• 11,380 points
8,941 views
+2 votes
11 answers

hadoop fs -put command?

Hi, You can create one directory in HDFS ...READ MORE

answered Mar 16, 2018 in Big Data Hadoop by nitinrawat895
• 11,380 points
80,418 views
0 votes
1 answer
0 votes
1 answer

How to create a FileSystem object that can be used for reading from and writing to HDFS?

Read operation on HDFS In order to read ...READ MORE

answered Mar 21, 2018 in Big Data Hadoop by nitinrawat895
• 11,380 points

edited Mar 22, 2018 by nitinrawat895 1,836 views
0 votes
1 answer

How can we transfer a PDF file to HDFS?

You can easily upload any file to ...READ MORE

answered Apr 13, 2018 in Big Data Hadoop by nitinrawat895
• 11,380 points
389 views
webinar REGISTER FOR FREE WEBINAR X
Send OTP
REGISTER NOW
webinar_success Thank you for registering Join Edureka Meetup community for 100+ Free Webinars each month JOIN MEETUP GROUP