Get a few lines of HDFS data

Question

I am having a 2 GB data in my HDFS.

Is it possible to get that data randomly. Like we do in the Unix command line

cat iris2.cs         


        

Answer 1

hadoop fs -cat  /user/hive/warehouse/vamshi_customers/* |tail

I think the head part is working as per the answer posted by @Viacheslav Rodionov works fine but for the tail part the one that I posted is working good.

Answer 2

You can use head command in Hadoop too! Syntax would be

hdfs dfs -cat <hdfs_filename> | head -n 3

This will print only three lines from the file.

Answer 3

Write this command

sudo -u hdfs hdfs dfs -cat "path of csv file" |head -n 50

50 is number of lines(this can be customize by the user based on the requirements)