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From "Steve Loughran (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-14969) Improve diagnostics in secure DataNode startup
Date Thu, 19 Oct 2017 19:59:00 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-14969?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16211640#comment-16211640

Steve Loughran commented on HADOOP-14969:

Add a confluent wiki page and then have the error text point to it, the way we do with network
errors. Keeps maintenance effort down as you can add a lot more detail

> Improve diagnostics in secure DataNode startup
> ----------------------------------------------
>                 Key: HADOOP-14969
>                 URL: https://issues.apache.org/jira/browse/HADOOP-14969
>             Project: Hadoop Common
>          Issue Type: Improvement
>            Reporter: Ajay Kumar
>            Assignee: Ajay Kumar
> When DN secure mode configuration is incorrect, it throws the following exception from
> {code}
>   private static void checkSecureConfig(DNConf dnConf, Configuration conf,
>       SecureResources resources) throws RuntimeException {
>     if (!UserGroupInformation.isSecurityEnabled()) {
>       return;
>     }
> ...
>     throw new RuntimeException("Cannot start secure DataNode without " +
>       "configuring either privileged resources or SASL RPC data transfer " +
>       "protection and SSL for HTTP.  Using privileged resources in " +
>       "combination with SASL RPC data transfer protection is not supported.");
> {code}
> The DN should print more useful diagnostics as to what exactly what went wrong.
> Also when starting secure DN with resources then the startup scripts should launch the
SecureDataNodeStarter class. If no SASL is configured and SecureDataNodeStarter is not used,
then we could mention that too.

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