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https://issues.apache.org/jira/browse/HADOOP-12563?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15280110#comment-15280110
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Steve Loughran commented on HADOOP-12563:
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AW: I do the paperwork to change these things when I see it: HADOOP-12913,
HADOOP-11822 ... and as someone who builds downstream code (spark, slider)
against branch-2 and branch-3, I'm often the first person complaining that
things have broken.
I don't know what other things HBase, Hive, Flink, etc have picked up; I don't
know what expectations they have on the behaviour of bits of the code. All I
know is the more changes which break compatibility across versions *break my
own code*. Yes, I try to address these problems before our customers get to see
them, but (a) it's a pain, (b) if it changes binary signatures then its a
problem for any app designed to build across versions, and (c) semantic changes
are the most subtle of all —these are the ones which lurk until production. And
you don't want me to add extra works to the ops teams, do you?
> 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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