Trino, formerly known as PrestoSQL, is an open-source distributed SQL query engine designed to query large datasets across various data sources. It is widely used for its ability to perform fast analytics on data lakes and other storage systems. Trino supports a wide range of connectors, making it a versatile tool for data querying and analysis.
When working with Trino, you might encounter the 'INVALID_USER' error. This error typically appears when attempting to connect to a Trino server using a user account that is either incorrect or does not exist. The error message might look something like this:
ERROR: INVALID_USER: The specified user is invalid or does not exist.
The 'INVALID_USER' error is triggered when Trino cannot authenticate the user attempting to establish a connection. This can happen due to several reasons:
Trino supports various authentication mechanisms, including LDAP, Kerberos, and password-based authentication. Ensuring that the authentication system is correctly configured is crucial for successful user validation.
To resolve the 'INVALID_USER' error, follow these steps:
Ensure that the username and password being used are correct. Double-check for any typographical errors in the username.
Confirm that the user account exists in the authentication system. If using LDAP, ensure that the user is present in the directory. For password-based authentication, verify the user in the relevant user database.
Examine the Trino configuration files to ensure that the authentication settings are correctly specified. For example, if using LDAP, check the ldap.properties file for correct server URLs and user DN patterns.
# Example LDAP configuration
ldap.url=ldap://ldap.example.com:389
ldap.user-bind-pattern=uid=${USER},ou=users,dc=example,dc=com
After verifying the user details and configuration, attempt to reconnect to the Trino server. Use a command-line tool or a client application to test the connection.
trino --server https://trino.example.com:8443 --user valid_user --password
For more information on configuring authentication in Trino, refer to the official Trino Security Documentation. Additionally, the Trino Deployment Guide provides insights into setting up and managing Trino clusters.
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