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From "Daryn Sharp (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-4548) Webhdfs doesn't renegotiate SPNEGO token
Date Wed, 03 Apr 2013 13:47:16 GMT

    [ https://issues.apache.org/jira/browse/HDFS-4548?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13620928#comment-13620928
] 

Daryn Sharp commented on HDFS-4548:
-----------------------------------

bq. [...] not to commit changes that will be undo right the way.

Regarding this point, all we're debating is the 1 line I moved from renew and cancel token
into the open connection.  This is to ensure that getting a token is also using a valid TGT
instead of implicitly assuming something else refreshed the TGT.  In no way did I really change
the pre-existing behavior, and it's the same long-standing behavior of hftp.  Any change would
be an enhancement that shouldn't block this jira.

More info on why UGI works the way it does:  The renewal thread runs for ticket cache TGTs
because it _must_ renew before the TGT expires or it's game over - a new TGT can't be acquired
without the user's creds.  Keytab logins do lazy refresh of TGTs because it can acquire a
new TGT with the keytab creds.

                
> Webhdfs doesn't renegotiate SPNEGO token
> ----------------------------------------
>
>                 Key: HDFS-4548
>                 URL: https://issues.apache.org/jira/browse/HDFS-4548
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>    Affects Versions: 2.0.0-alpha, 3.0.0, 0.23.7
>            Reporter: Daryn Sharp
>            Assignee: Daryn Sharp
>            Priority: Blocker
>         Attachments: HDFS-4548.branch-23.patch, HDFS-4548.branch-23.patch, HDFS-4548.branch-23.patch,
HDFS-4548.branch-23.patch, HDFS-4548.branch-23.patch, HDFS-4548.patch, HDFS-4548.patch, HDFS-4548.patch,
HDFS-4548.patch, HDFS-4548.patch
>
>
> When the webhdfs SPNEGO token expires, the fs doesn't attempt to renegotiate a new SPNEGO
token.  This renders webhdfs unusable for daemons that are logged in via a keytab which would
allow a new SPNEGO token to be generated.

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