2. Upgrade the Stack

Upgrade the HDP repository on all hosts and replace the old repository file with the new file:

For RHEL/CentOS/Oracle Linux 5

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

For RHEL/CentOS/Oracle Linux 6

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

For SLES 11

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

	Important
	Make sure to download the HDP.repo file under /etc/yum.repos.d on ALL hosts.

Update the stack version in the Server database. Use the command appropriate for a remote, or local repository, as described in this step.
```
ambari-server upgradestack HDP-2.1 {HDP.Base.URL} {$os}
```
For a remote, accessible, public repository, the HDP.Base.URL is the same as the baseurl={HDP.Base.URL} in the HDP.repo file download in Step 1. For a local repository, use the local repository Base URL you have configured for the HDP Stack. For links to download the HDP repository files for your version of the Stack, see HDP Stack Repositories.
Back up the files in following directories on the Oozie server host and make sure that all files, including *site.xml files are copied.
```
mkdir oozie-conf-bak 
cp -R /etc/oozie/conf/* oozie-conf-bak
```
Remove the old oozie directories on all Oozie server and client hosts
- rm -rf /etc/oozie/conf
- rm -rf /usr/lib/oozie/
- rm -rf /var/lib/oozie/

Upgrade the stack on all Agent hosts. Skip any components your installation does not use.:

For RHEL/CentOS/Oracle Linux

Remove WebHCat, HCatalog, and Oozie components.
```
yum erase "webhcat*" "hcatalog*" "oozie*"
```

Upgrade the following components:

yum upgrade "collectd*" "epel-release*" "gccxml*" "pig*" "hadoop*" "sqoop*" "zookeeper*" "hbase*" "hive*" hdp_mon_nagios_addons

yum install webhcat-tar-hive webhcat-tar-pig

yum install hive*

yum install oozie oozie-client

rpm -e --nodeps bigtop-jsvc

yum install bigtop-jsvc

Verify that the components were upgraded:
```
yum list installed | grep HDP-$old-stack-version-number
```
None of the components from that list should appear in the returned list.

For SLES

Remove WebHCat, HCatalog, and Oozie components.
```
zypper remove webhcat\* hcatalog\* oozie\*
```

Upgrade the following components:

zypper up "collectd*" "epel-release*" "gccxml*" "pig*" "hadoop*" "sqoop*" "zookeeper*" "hbase*" "hive*" hdp_mon_nagios_addons

zypper install webhcat-tar-hive webhcat-tar-pig

zypper up -r HDP-2.1.1.0

zypper install hive\*

zypper install oozie oozie-client

Verify that the components were upgraded:

rpm -qa | grep hadoop, rpm -qa | grep hive and rpm -qa | grep hcatalog

If components were not upgraded, upgrade them as follows:
```
yast --update hadoop hcatalog hive
```