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From "Daniel Templeton (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HADOOP-12732) Filesystem.addDelegationToken() should automatically replace _HOST
Date Fri, 22 Jan 2016 19:44:39 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-12732?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Daniel Templeton updated HADOOP-12732:
    Attachment: HADOOP-12732.001.patch

Here's what the change would look like.

> Filesystem.addDelegationToken() should automatically replace _HOST
> ------------------------------------------------------------------
>                 Key: HADOOP-12732
>                 URL: https://issues.apache.org/jira/browse/HADOOP-12732
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: fs
>    Affects Versions: 2.7.1
>            Reporter: Daniel Templeton
>            Assignee: Daniel Templeton
>            Priority: Critical
>         Attachments: HADOOP-12732.001.patch
> It is currently the client's responsibility to call {{SecurityUtil.getServerPrincipal()}}
to replace the _HOST placeholder in any principal name used for a delegation token.  This
is a non-optional operation and should not be pushed onto the client.  As the {{SecurityUtil.getServerPrincipal()}}
call is already designed to be both highly efficient and idempotent, I see no reason not to
move the call into the {{FileSystem.addDelegationToken()}} call.
> As additional incentive, all client apps that followed the distributed shell as the canonical
example failed to do the replacement because distributed shell fails to do the replacement.
 (See YARN-4629.)  Rather than fixing the whole world, let's move the operation into the API
where it belongs.

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