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From "Junping Du (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-7162) Remove XML excludes file format
Date Thu, 14 Sep 2017 22:19:00 GMT

    [ https://issues.apache.org/jira/browse/YARN-7162?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16167043#comment-16167043

Junping Du commented on YARN-7162:

bq. Maybe we do want to support the old format, JSON, and XML, but we may need to tweak the
XML format incompatibly depending on how the JSON format ends up and how the pluggable code
for it works; but we'd be stuck if we make a release with the existing XML in that case. Or
maybe once we have the JSON format we don't want to worry about the XML format. In any case,
the safest thing to do is to remove the XML format now before the release.
JSON format is something Ming propose to have. I gave it a +1 because I think it is to replace/add
XML format but not just simply kill XML one.
For me, to have JSON format support is just something nice to have but not must. The work
I care more here is to verify its functionality and make it stabilized. The cases you listed
above is missing an important case which is none of us has bandwidth to add JSON format back
so we could totally lose this feature/functionality. I would prefer to call it an alpha feature
instead of remove it which cause unnecessary feature regression.

> Remove XML excludes file format
> -------------------------------
>                 Key: YARN-7162
>                 URL: https://issues.apache.org/jira/browse/YARN-7162
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: graceful
>    Affects Versions: 2.9.0, 3.0.0-beta1
>            Reporter: Robert Kanter
>            Assignee: Robert Kanter
>            Priority: Blocker
>         Attachments: YARN-7162.001.patch, YARN-7162.branch-2.001.patch
> YARN-5536 aims to replace the XML format for the excludes file with a JSON format.  However,
it looks like we won't have time for that for Hadoop 3 Beta 1.  The concern is that if we
release it as-is, we'll now have to support the XML format as-is for all of Hadoop 3.x, which
we're either planning on removing, or rewriting using a pluggable framework.  
> [This comment in YARN-5536|https://issues.apache.org/jira/browse/YARN-5536?focusedCommentId=16126194&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-16126194]
proposed two quick solutions to prevent this compat issue.  In this JIRA, we're going to remove
the XML format.  If we later want to add it back in, YARN-5536 can add it back, rewriting
it to be in the pluggable framework.

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