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https://issues.apache.org/jira/browse/YARN-7162?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16167021#comment-16167021
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Robert Kanter commented on YARN-7162:
-------------------------------------
It would be better if we had the pluggable JSON support (i.e. YARN-5536), but
it seems like nobody has the time to work on that before beta 1. As I said
before, the concern here is that if we make a release with the XML format,
we're going to have to keep supporting that format for the lifetime of Hadoop
3. 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; we can always
add XML back later using the pluggable framework as part of YARN-5536. In
other words, keeping it isn't necessarily a backwards incompatible change, but
keeping it runs the risk of a potential backwards incompatible change in the
future, especially given that we're planning on rewriting it.
[~mingma] actually voted for removing the XML format for now:
{quote}Sorry for the delayed response. I have been busy and won't have time to
look into. I vote for 2nd option.{quote}
{quote}
2. We could remove the XML format now (so we'd only have the original format),
and do the rest of this work later. Users won't be able to specify individual
different timeouts per host in the meantime though.
{quote}
> 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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