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https://issues.apache.org/jira/browse/HADOOP-12563?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15277453#comment-15277453
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Matthew Paduano commented on HADOOP-12563:
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I think he is referring to using two incompatible versions of the same class
(Credentials).
One is from trunk, one is from another branch (although simply using an
older jar file from even the same branch would cause the same error).
I agree with [~aw] in this case. in general, one cannot load two arbitrary
versions of
a class and expect data to remain compatible between them. this is an
issue of mismatched jar files. it is just lucky that it can be alleviated via
a simple
config prop addition.
> 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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