Troubleshooting Trino

Kerberos and LDAP cannot be enabled at the same time since they are set using the same property, http-server.authentication.type.

If you enable LDAP on a Kerberos cluster, Kerberos authentication will be disabled for Trino. However, Kerberos will remain enabled for the Hive connector so that you can access it by making below modifications.

Create and add user-mappings.json and rules.json under /etc/trino/conf.

Bash
    
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# Ensure directory existsls -lart /etc/trino/conf​# Create user-mappings.jsoncat <<EOF > /etc/trino/conf/user-mappings.json{    "rules": [        {            "pattern": "^([^/]+).*$",            "allow": true        }    ]}EOF​# Create rules.jsoncat <<EOF > /etc/trino/conf/rules.json{  "impersonation": [    {      "original_user": ".*",      "new_user": ".*"    }  ],  "principals": [    {      "principal": "(.*)",      "principal_to_user": "\$1",      "allow": true    },    {      "principal": "([^/]+)(/.*)?@.*",      "principal_to_user": "\$1",      "allow": true    }  ]}EOF
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To add a custom krb5-user mapping, append the following line at the end of the file by Navigating to Ambari UI → Trino → Advanced Configurations → coordinator-config.

http-server.authentication.krb5.user-mapping.file=/etc/trino/conf/user-mappings.json

Bash
    
 
http-server.authentication.krb5.keytab=/etc/security/keytabs/trino.keytabhttp.authentication.krb5.config=/etc/krb5.confnode.internal-address-source=FQDNhttp-server.authentication.krb5.user-mapping.file=/etc/trino/conf/user-mappings.json
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Last updated on May 7, 2025

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