apache/hadoop · error · RuntimeException

Could not resolve Kerberos principal name:

Error message

Could not resolve Kerberos principal name: 

What it means

Error "Could not resolve Kerberos principal name: " thrown in apache/hadoop.

Source

Thrown at hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/AuthenticationFilterInitializer.java:86

    Map<String, String> filterConfig = new HashMap<String, String>();

    //setting the cookie path to root '/' so it is used for all resources.
    filterConfig.put(AuthenticationFilter.COOKIE_PATH, "/");
    Map<String, String> propsWithPrefix = conf.getPropsWithPrefix(prefix);

    for (Map.Entry<String, String> entry : propsWithPrefix.entrySet()) {
      filterConfig.put(entry.getKey(), entry.getValue());
    }

    //Resolve _HOST into bind address
    String bindAddress = conf.get(HttpServer2.BIND_ADDRESS);
    String principal = filterConfig.get(KerberosAuthenticationHandler.PRINCIPAL);
    if (principal != null) {
      try {
        principal = SecurityUtil.getServerPrincipal(principal, bindAddress);
      }
      catch (IOException ex) {
        throw new RuntimeException("Could not resolve Kerberos principal name: " + ex.toString(), ex);
      }
      filterConfig.put(KerberosAuthenticationHandler.PRINCIPAL, principal);
    }
    return filterConfig;
  }

}

View on GitHub (pinned to 2add963021)

Solutions

1. Set the Kerberos principal for the authentication filter (hadoop.http.authentication.kerberos.principal) to a valid, resolvable principal including the hostname.
2. Ensure DNS resolution works for the host so the _HOST placeholder can be replaced.
3. Verify the keytab exists and is readable at the configured path.

When it happens

Trigger: Thrown at hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/AuthenticationFilterInitializer.java:86 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of apache/hadoop@2add963021 (2026-08-22). Data as JSON: /api/errors/bedda4e28b85f304. Report an issue: GitHub.