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  http://public-repo-1.hortonworks.com/HDP/centos5/2.x/updates/2.1.5.0/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/updates/2.1.5.0/hdp.repo -O /etc/yum.repos.d/HDP.repo

For SLES 11 sp1

wget http://public-repo-1.hortonworks.com/HDP/sles11sp1/2.x/updates/2.1.5.0/hdp.repo -O /etc/zypp/repos.d/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 Ambari Server database. Use this command to update the Stack version to HDP-2.1:
```
ambari-server upgradestack HDP-2.1
```
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 Ambari Agent hosts.

	Note
For each host, identify the HDP components installed on each host. Use Ambari Web, as described here, to view components on each host in your cluster. Based on the HDP components installed, tailor the following upgrade commands for each host to upgrade only components residing on that host. For example, if you know that a host has no HBase service or client packages installed, then you can adapt the command to not include HBase, as follows: yum upgrade "collectd" "gccxml" "pig" "hadoop" "sqoop" "zookeeper" "hive*"

Note

For each host, identify the HDP components installed on each host. Use Ambari Web, as described here, to view components on each host in your cluster. Based on the HDP components installed, tailor the following upgrade commands for each host to upgrade only components residing on that host. For example, if you know that a host has no HBase service or client packages installed, then you can adapt the command to not include HBase, as follows:

yum upgrade "collectd*" "gccxml*" "pig*" "hadoop*" "sqoop*" "zookeeper*" "hive*"

	Important
	If you are writing to mulitple systems using a script, do not use " " with the run command. You can use " " with pdsh -y.

For RHEL/CentOS/Oracle Linux

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

Upgrade the following components:

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

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

zypper up -r HDP-2.1.2.0

zypper install hive\*

zypper install oozie oozie-client

Verify that the components were upgraded:

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

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

Upgrade the Hive metastore database schema.
```
$HIVE_HOME/bin/schematool -upgradeSchema -dbType <$databaseType>  -userName <$connectionUserName> -passWord <$connectionPassWord> 
```
where $username and $password are credentials with permissions sufficient to override the config file, and $databaseType equals any of the following databases type values:
- derby
- mysql
- oracle
- postgres
For more information about using the Hive Schema tool, see the Hive Schema Tool documentation.

Legal notices