2. Upgrade Hadoop - Hortonworks Data Platform

On all nodes, clean the yum repository.

For RHEL/CentOS:
```
yum clean all 
```
For SLES:
```
zypper clean --all
```

Uninstall the HDP 1.x packages.

For RHEL/CentOS:

yum erase hadoop-pipes hadoop-sbin hadoop-native oozie

For SLES:

zypper rm hadoop-pipes hadoop-sbin hadoop-native oozie hbase hadoop*

Configure your repository.

The standard HDP install fetches the software from a remote yum repository  over the Internet. To use this option, you must set up access to the remote  repository and have an available Internet connection for each of your  hosts

	Note
	If your cluster does not have access to the Internet, or you are  creating a large cluster and you want to conserve bandwidth, you can  instead provide a local copy of the HDP repository that your hosts can  access. For more information, see Deployment Strategies for Data Centers with  Firewalls, a separate document in this set.

For each node in your cluster, download the yum repo configuration  file hdp.repo. From a terminal window,  enter the following wget command.

For RHEL/CentOS/Oracle Linux 5 :

 wget http://public-repo-1.hortonworks.com/HDP/centos5/2.x/GA/2.1-latest/hdp.repo -O /etc/yum.repos.d/hdp.repo

For RHEL/CentOS/Oracle Linux 6:

 wget http://public-repo-1.hortonworks.com/HDP/centos6/2.x/GA/2.1-latest/hdp.repo -O /etc/yum.repos.d/hdp.repo

For SLES 11:

 wget http://public-repo-1.hortonworks.com/HDP/suse11/2.x/GA/2.1-latest/hdp.repo -O /etc/zypp/repos.d/hdp.repo

Confirm the HDP repository is configured by checking the repo  list.
- For RHEL/CentOS/Oracle Linux: 
```
yum repolist
```
- For SLES: 
```
zypper repos
```

Install Hadoop

For RHEL/CentOS/Oracle Linux:
```
yum upgrade hadoop*
```

For SLES:

zypper up hadoop* hadoop-hdfs hadoop-lzo

Install YARN

For RHEL/CentOS/Oracle Linux:

yum install hadoop-mapreduce hadoop-yarn

For SLES:
```
zypper up hadoop-mapreduce hadoop-yarn
```

Verify HDP 2.x packages have installed successfully.

For RHEL/CentOS/Oracle Linux:
```
yum list hadoop*|grep HDP-2 
```
For SLES:
```
zypper pa|grep HDP-2 
```
Verify that you have HDP 2.x installed:
```
hadoop version
```
You may need to add /etc/hadoop/conf/hadoop-env.sh in /usr/bin/hadoop for $JAVA_HOME.