Version: 2.3

Install Data Migrator

Ready to install? Check the prerequisites and then follow these steps to get up and running with Data Migrator.

Install Data Migrator

Download Data Migrator and install it on your chosen host. If you're migrating from Hadoop Distributed File System (HDFS), install Data Migrator on an edge node in the Hadoop cluster. Run the following installation command:
```
wget https://cirata.com/downloads/livedata-migrator.sh
```
Make the installation script executable and install as the root (or sudo) user. These commands assume that the installer is inside your working directory.
```
chmod +x livedata-migrator.sh && ./livedata-migrator.sh
```
Alternative /tmp directory
The Data Migrator installer extracts its contents to a temporary directory and decompresses them. By default, the temporary directory is a sub-directory of /tmp.
In some situations, extracting and decompressing in the default temporary directory fails. For example, if there is not enough disk space remaining, or if /tmp is mounted as noexec.
To avoid these issues, extract the contents to a different temporary directory by adding the --target option when you run the installer:
Example (Using the full installer that contains packages for all supported platforms)
./livedata-1.21.0-4-full_rpm_installer.sh --target /opt/wandisco/alternate_tmp_dir
Do not use /opt/wandisco/tmp as the value for --target or the installation will fail.
You can delete your temporary directory and its contents after installation.
Check the status of each service:
Run the following command for each of the services, listed below
```
systemctl status <service name>
```
The service names are: livedata-migrator, hivemigrator, and livedata-ui.
If your system is running without systemd the commands use a different form.

Adjust service file descriptor limit

For most production use cases we recommend increasing the Data Migrator service file descriptor limit. Contact Support if you have questions or concerns before changing this value.

To adjust the Data Migrator service file descriptor limit.

On the command line, run the systemctl edit <service> command.

Example edit livedata-migrator service

systemctl edit livedata-migrator

Add the following lines to adjust the file descriptor limit and save the changes.

Example file descriptor config values

[Service]
LimitNOFILE=64000

Restart the Data Migrator service.

Example restart Data Migrator

systemctl restart livedata-migrator

These steps create a file to override the default Data Migrator (livedata-migrator) service file descriptors configuration located at:

/etc/systemd/system/livedata-migrator.service.d/override.conf

System and custom users for installation

To run the installer using a default user, run the following command:

./livedata-migrator.sh

Component	Default system user	Default system user group
Data Migrator	`hdfs`	`hdfs`
UI	`hdfs`	`hdfs`
Hive Migrator	`hive`	`hadoop`

A source with a mounted network-attached filesystem (NFS) is unlikely to have the default users present. In this case, set up your own user and group. See Running a service as a different user or group.

User and group privileges

If your cluster is Kerberized, the default hdfs and hive users and groups have more privileges than are necessary. Increase security by using system user/groups that have only the minimum required permissions. Learn more.

To install the product using a custom user or a custom user group, run the following commands:

Platform-specific installer (Contains only a single platform-specific package to reduce the installer's filesize.)

./livedata-migrator.sh --user <custom user> --group <custom group>

Full installer (Contains packages for all supported platforms.)

./livedata-x.x.x-xx-full_rpm_installer.sh -- --user <custom user> --group <custom group>

This sets the custom user and custom user group for all services and their respective directories.

For more information about configuring custom users, go to Configure system users.