This page describes how to remove Trafodion and/or a Hadoop distribution.
Remove Trafodion
Use these instructions to remove Trafodion.
| NOTE You do not need to use the trafodion_uninstaller script if upgrading Trafodion. Instead, use the trafodion_install script, which automatically upgrades the version of Trafodion. Please refer to Install for further information. |
Run the commands from the first node of the cluster. Do not run them from a machine that is not part of the Trafodion cluster.
Step 1: Stop Trafodion
Do the following:
su trafodion cd $MY_SQROOT/sql/scripts or cds sqstop
Step 2: Run trafodion_uninstaller
trafodion_uninstaller accepts the following command options.
| Option | Description |
|---|---|
| instance <dir-name> | <dir-name> represents the directory path of the Trafodion instance to remove. Run this option from the trafodion user ID. |
| --all | Completely removes Trafodion, including the trafodion user ID and its /root directory. Run this option from a user ID with sudo access |
Examples
cd /root/trafodion_downloads/installer # Uninstall Trafodion but leave user IDs and root directory in place ./trafodion_uninstaller --instance /home/trafodion/trafodion # Completely remove Trafodion ./trafodion_uninstaller --all
Remove Hadoop Distribution
Use these instructions of you need to change the Hadoop distribution on your environment.
Assumption: You’ve already removed Trafodion, if previously installed.
Remove Cloudera
cloudera_uninstall must be run by a user with root privileges. It accepts the following command options.
| Option | Description |
|---|---|
| --help | Print help text and exit. |
| --nodes "<node-list>" | <node-list represents a space-separated list from which Cloudera should be uninstalled. Quotes are required. |
Example
cd /root/trafodion_downloads/installer/tools ./cloudera_uninstall --nodes "redhat-1 redhat-2"
Remove Hortonworks
hortonworks_uninstall must be run by a user with root privileges. It accepts the following command options.
| Option | Description |
|---|---|
| --help | Print help text and exit. |
| --nodes "<node-list>" | <node-list represents a space-separated list from which Hortonworks should be uninstalled. Quotes are required. |
Example
cd /root/trafodion_downloads/installer/tools ./hortonworks_uninstall --nodes "redhat-1 redhat-2"
| NOTE During removal, the Ambari Server database must be reset. Type yes when prompted. Example Resetting ambari-server **** WARNING **** You are about to reset and clear the Ambari Server database. This will remove all cluster host and configuration information from the database. You will be required to re-configure the Ambari server and re-run the cluster wizard. Are you SURE you want to perform the reset [yes/no] (no)? yes Confirm server reset [yes/no](no)? yes |
Remove MapR
| NOTE Trafodion does not currently support MapR. However, the mapr_unistall allows you to remove an existing MapR installation. Follow these instructions to remove MapR and install one of the supported Hadoop distributions before installing Trafodion. |
mapr_uninstall must be run by a user with root privileges. It accepts the following command options.
| Option | Description |
|---|---|
| --help | Print help text and exit. |
| --nodes "<node-list>" | <node-list represents a space-separated list from which MapR should be uninstalled. Quotes are required. |
Do the following:
| Step | Description | Example |
|---|---|---|
| Download Trafodion | If you haven't done so already, download Trafodion. | |
| Create trafodion_downloads Directory | Place the downloaded trafodion-1.1.<n>.tar.gz and installer-1.1.<n>_v<num>.tar.gz tar files into the trafodion_downloads directory. |
mkdir $HOME/trafodion_downloads mv <your-download-path>/trafodion-1.1.<n>.tar.gz $HOME/trafodion_downloads mv <your-download-path>/installer-1.1.<n>_v<num>.tar.gz $HOME/trafodion_downloads cd $HOME/trafodion_downloads |
| Unpack tar Files | Enables access to the Trafodion installation tools. |
tar -xzf trafodion-1.1.<n>.tar.gz tar -xzf installer-1.1.<n>_v<num>.tar.gz |
| Run mapr_uninstall | Remove the MapR distribution software. |
cd /root/trafodion_downloads/installer/tools ./mapr_uninstall --nodes "redhat-1 redhat-2" ./mapr_uninstall |
Switch Hadoop Distribution
If needed, you can switch the Hadoop distribution that Trafodion is running on without reinstalling Trafodion.
Do the following.
Step 1: Shut Down Trafodion
su trafodion cd $MY_SQROOT/sql/scripts sqstop
Step 2: Remove Hadoop Distribution
Remove the Hadoop Distribution per the instructions above.
| Hadoop Distribution | Instructions |
|---|---|
| Cloudera | Remove Cloudera |
| Hortonworks | Remove Hortonworks |
| MapR | Remove MapR |
Step 3: Reinstall Hadoop Distribution
Refer to Install Hadoop Distribution.
Step 4: Run Trafodion Installer
Refer to the Install.
