3. Upgrade ZooKeeper and HBase

Execute the following command on all the ZooKeeper nodes:

For RHEL/CentOS:

yum upgrade zookeeper-3.4.5.1.3.0.0

For SLES:

zypper update zookeeper-3.4.5.1.3.0.0
zypper remove zookeeper

This command uninstalls HBase. Execute the following command to install HBase:

zypper install hbase-0.94.6.1.3.0.0

	Important
	When removing and installing packages, rename those files under the `/conf` directory that have `.rpmsave` extension to original to retain the customized configs. Alternatively, you can also use the configuration files (under the `/conf` directory) you backed up before upgrading.

zypper se -s zookeeper

You should see ZooKeeper v3.4.5.1.3.0.0 in the output. Install ZooKeeper v3.4.5.1.3.0.0:

zypper install zookeeper-3.4.5.1.3.0.0

Start ZooKeeper. On all the ZooKeeper host machines, execute the following command:
```
sudo su -l $ZOOKEEPER_USER -c "source /etc/zookeeper/conf/zookeeper-env.sh; export ZOOCFGDIR=/etc/zookeeper/conf; /usr/lib/zookeeper/bin/zkServer.sh start >> $ZOOKEEPER_LOG_DIR/zoo.out\"
                    
```
where
- $ZOOKEEPER_USER is the ZooKeeper Service user. For example, zookeeper.
- $ZOOKEEPER_LOG_DIR is the directory where ZooKeeper server logs are stored. For example, /var/log/zookeeper.
Execute the following commands on the HBase Master and the HBase slave nodes (RegionServers):
- For RHEL/CentOS:
```
yum upgrade hbase                
```
Start HBase.
1. Start HBase Master. On the HBase Master host machine, execute the following command:
```
sudo su -l $HBASE_USER -c "/usr/lib/hbase/bin/hbase-daemon.sh --config /etc/hbase/conf start master"               
```
2. Start all RegionServers. On all the RegionServers, execute the following command:
```
sudo su -l $HBASE_USER -c "/usr/lib/hbase/bin/hbase-daemon.sh --config /etc/hbase/conf start regionserver\"  
```
  where $HBASE_USER is the HBase Service user. For example, hbase.