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From "Jitendra Nath Pandey (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-2764) Fix renewal of dfs delegation tokens
Date Thu, 04 Aug 2011 22:31:28 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-2764?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13079654#comment-13079654
] 

Jitendra Nath Pandey commented on MAPREDUCE-2764:
-------------------------------------------------

1. The patch introduces some refactoring around token selector, and also probably code cleanup
in HftpFileSystem.java, but it would be good if that is done in a separate jira. This will
keep this patch smaller and focused. 
2. I like the idea to store uri in the token which is issuer of the token. So going forward
we have two things in the token:
 - service: where the token should be used. This should contain rpc port. This remains same
as we have today, so no changes should be needed to set/getService APIs.
 - issuer: The uri of the file system that issued this token and add set/getIssuer APIs to
the Token.
  Can we rename serviceUri to something like issuer or something else, just to differentiate
it from service.
  So, the DelegationTokenRenewal looks at the issuer, while token selectors continue to use
service, as they do today.

3. I will recommend the issuer should be set by every filesystem that implements getDelegationToken.
4. So we add only two APIs to Token: set/getIssuer. We don't need to add others like getServiceAuthority.
5. The patch didn't compile for me. Probably a typo in TestDelegationTokenRenewal.

> Fix renewal of dfs delegation tokens
> ------------------------------------
>
>                 Key: MAPREDUCE-2764
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-2764
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>            Reporter: Daryn Sharp
>            Assignee: Daryn Sharp
>             Fix For: 0.20.205.0
>
>         Attachments: MAPREDUCE-2764.patch
>
>
> The JT may have issues renewing hftp tokens which disrupt long distcp jobs.  The problem
is the JT's delegation token renewal code is built on brittle assumptions.  The token's service
field contains only the "ip:port" pair.  The renewal process assumes that the scheme must
be hdfs.  If that fails due to a {{VersionMismatchException}}, it tries https based on another
assumption that it must be hftp if it's not hdfs.  A number of other exceptions, most commonly
{{IOExceptions}}, can be generated which fouls up the renewal since it won't fallback to https.

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