[jira] Updated: (MAPREDUCE-1959) Should use long name for token renewer on the client side

["Kan Zhang (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/MAPREDUCE-1959?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Kan Zhang updated MAPREDUCE-1959:
---------------------------------

    Attachment: m1959-01.patch

A trivial patch.

> Should use long name for token renewer on the client side
> ---------------------------------------------------------
>
>                 Key: MAPREDUCE-1959
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-1959
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: security
>            Reporter: Kan Zhang
>            Assignee: Kan Zhang
>         Attachments: m1959-01.patch
>
>
> When getting a delegation token from a NN, a client needs to specify the renewer for the token. For use on a MapRed cluster, JT should be specified as the renewer. However, in the current code, the client maps JT's long name (Kerberos principal name) to cluster-internal short name and then sets the short name as the renewer. This is undesirable for 2 reasons. 1) It's unnecessary since NN (or JT) converts client-supplied renewer from long to short name anyway. 2) In principle, the mapping from long to short name should be done on the server. This is consistent with the authentication case, where the client uses the same long name to authenticate to multiple servers and servers map client's long name to their own internal short names. It facilitates using the same job client to get delegation tokens from multiple NN's, which may have different mapping rules for JT.

-- 
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.