Before starting the installation of Jethro, ensure that the conditions specified in the following sections are met:
- Only the Supported Platforms are being used.
- Jethro v2.1.4 (or higher) is installed on the same server where you plan to install Jethro Manager.
Installing the Jethro Manager Software
Jethro Manager installation is pretty simple. It runs as root, extracts Jethro Manager software into /opt/jethro/jethromng/, and automatically creates and configures the Jethro OS user (if needed) and Linux services. To install Jethro Manager:
- Sign-in as root.
Install openJDK by running:
Download the Jethro RPM to a local directory:
Install the RPM you downloaded, by running:
Jethro Manager uses port 9100 for communicating with your browser. Make sure that the security policy of your server allows that kind of communication, and that the port is open.
To verify that the port is open, run the following command within the server: curl localhost:9100
If the port is closed, you'll see the following message: curl: (7) Failed to connect to localhost port 9100: Connection refused
To have Jethro Manager use a different, see Jethro Manager connections - changing the default port.
If you're installing Jethro Manager and you have previously configured it to use a custom port, then once installation complete you need to configure the custom port again as described in Jethro Manager connections - changing the default port.
- Loading data directly from HDFS/Hive/Impala requires installing the client shells for each, on the same machine where the Jethro query node is installed, and having their core-site point to the name node of your cluster. If you're not planning to load directly from one or more of these sources, you can skip installing their client shells.
Jethro Instances which were created by using a Jethro versions lower than 3.0, needs to be updated manually with system tables, in order to support the communication with the load manager. To do that, run the following command on the Jethro machine:
If the connection between Jethro Manager and a Jethro Instance, is being made based on a user other than 'jethro', a permission must be granted for that user to access Jethro's system tables. To do that, run the following command using JethroClient, as an admin user (The instance admin - typically user 'jethro'):
To change the OS user which runs the Jethro Manager services, run the following commands: