2. Upgrade Hadoop

On all nodes, clean the yum repository.
- For RHEL/CentOS:
```
yum clean all 
```
- For SLES:
```
zypper clean --all
```
- For Ubuntu:
```
apt-get clean all
```
Use the HDP Utility script to calculate memory configuration settings.

Upgrade Hadoop

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

For SLES:

zypper install hadoop* hadoop-hdfs hadoop-lzo hadoop-mapreduce hadoop-yarn

For Ubuntu:

apt-get update
apt-get install hadoop hadoop-hdfs libhdfs0 libhdfs0-dev hadoop-yarn hadoop-mapreduce hadoop-client opensslliblzo2-2 liblzo2-dev hadoop-lzo hadoop-mapreduce hadoop-yarn

Verify HDP 2.1 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 2.1 installed:
```
hadoop version
```
  You may need to add /etc/hadoop/conf/hadoop-env.sh in /usr/bin/hadoop for $JAVA_HOME.
- For Ubuntu:
```
 dpkg -s HDP-2 | grep Status 
```

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