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https://issues.apache.org/jira/browse/HADOOP-12563?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15277364#comment-15277364
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Matthew Paduano commented on HADOOP-12563:
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>From the line numbers in the lower part of the stack trace, it looks like you
>are using mixed versions of the Credentials code to manipulate the token
>files. you are making the file with a new version (version 1) and trying to
>read it with the unpatched code that doesn't know the new version. I think
>lines 215 and 194 in your lower stack trace correspond to lines 220 and 199
>(which is what they were before this patch was applied).
I had always considered it a requirement:
future code can read legacy tokens, but legacy code can not ready future
tokens.
suggestions welcome.
> Updated utility to create/modify token files
> --------------------------------------------
>
> Key: HADOOP-12563
> URL: https://issues.apache.org/jira/browse/HADOOP-12563
> Project: Hadoop Common
> Issue Type: New Feature
> Affects Versions: 3.0.0
> Reporter: Allen Wittenauer
> Assignee: Matthew Paduano
> Fix For: 3.0.0
>
> Attachments: HADOOP-12563.01.patch, HADOOP-12563.02.patch,
> HADOOP-12563.03.patch, HADOOP-12563.04.patch, HADOOP-12563.05.patch,
> HADOOP-12563.06.patch, HADOOP-12563.07.patch, HADOOP-12563.07.patch,
> HADOOP-12563.08.patch, HADOOP-12563.09.patch, HADOOP-12563.10.patch,
> HADOOP-12563.11.patch, HADOOP-12563.12.patch, HADOOP-12563.13.patch,
> HADOOP-12563.14.patch, HADOOP-12563.15.patch, HADOOP-12563.16.patch,
> dtutil-test-out, example_dtutil_commands_and_output.txt,
> generalized_token_case.pdf
>
>
> hdfs fetchdt is missing some critical features and is geared almost
> exclusively towards HDFS operations. Additionally, the token files that are
> created use Java serializations which are hard/impossible to deal with in
> other languages. It should be replaced with a better utility in common that
> can read/write protobuf-based token files, has enough flexibility to be used
> with other services, and offers key functionality such as append and rename.
> The old version file format should still be supported for backward
> compatibility, but will be effectively deprecated.
> A follow-on JIRA will deprecrate fetchdt.
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