This document provides instructions for two exercises to transfer data to and from a Hadoop cluster using different methods. The first exercise uses hadoopfs commands to copy a local file to a directory within a volume on the cluster. The second exercise mounts the cluster via NFS to copy a local file directly into the cluster's filesystem. Both exercises allow verifying the successful copy using hadoopfs commands.

1. LAB: NFS July 2012
LAB: NFS
Goal
In these exercises you will transfer data to and from your cluster via two separate
methods to understand the differences between each of these processes.
Exercise: hadoopfs
Connect to your node via ssh
Create a text file in the pwd of your local filesystem
o touch test.txt
List the contents of your local pwd
o ls
List the contents of your volume on the cluster
o hadoopfs -ls /<your_volume>
Create a directory within your volume on the cluster
o hadoopfs -mkdir /<your_volume>/<some_dir>
Copy the local text file you created in the previous step to the directory
within your volume on the cluster
o hadoopfs -put test.txt /<your_volume>/<some_dir>
List the contents of the directory within your volume on the cluster to verify
that the copy was successful
o hadoopfs –ls /<your_volume>/<some_dir>
Exercise: Mount the Cluster to Itself and Copy a File
Connect to your node via ssh
List the NFS shares currently exported on the node
sudoshowmount -e <your_node_hostname>
Set up a mount point for the NFS share
sudomkdir /<cluster_mount_point>
Mount the cluster via NFS
sudo mount –o
nolock<your_node_hostname>:/<cluster_mount_point>
Copy a file from your local node filesystem to the cluster
sudocp
/tmp/test.txt/<cluster_mount_point>/<cluster_name>/<
your_volume>/<some_dir>/
Verify that the file is now in the cluster with hadoopfs
hadoopfs -ls /<your_volume>/<some_dir>
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