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https://issues.apache.org/jira/browse/YARN-3539?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14516704#comment-14516704
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Steve Loughran commented on YARN-3539:
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+1 for consolidating the patches, including a declaration that the ATS v1 API
is considered a REST API for which compatibility will be maintained.
# is is critical to declare that ATSv1 is stable. Without that guarantee, it is
impossible for any application to commit to using the APIs. Even mapreduce is
in trouble if you attempt to run an older version of an MR app against a more
recent version of the cluster, e.g a 2.6 version against a 2.7.1 Hadoop cluster.
# ATS v2 may add more options, failover etc. There's no way the existing
(shipping) clients & REST clients can access these features. What is essential
is that all the existing operations must not change, so that shipping
applications do not break.
Spark depends on this for the SPARK-1537 feature, some ongoing worth with
Accumulo depends on this, when Slider adds ATS support we'll depend on this
stability guarantee, etc, etc.
> Compatibility doc to state that ATS v1 is a stable REST API
> -----------------------------------------------------------
>
> Key: YARN-3539
> URL: https://issues.apache.org/jira/browse/YARN-3539
> Project: Hadoop YARN
> Issue Type: Improvement
> Components: documentation
> Affects Versions: 2.7.0
> Reporter: Steve Loughran
> Assignee: Steve Loughran
> Attachments: HADOOP-11826-001.patch, HADOOP-11826-002.patch,
> YARN-3539-003.patch
>
>
> The ATS v2 discussion and YARN-2423 have raised the question: "how stable are
> the ATSv1 APIs"?
> The existing compatibility document actually states that the History Server
> is [a stable REST
> API|http://hadoop.apache.org/docs/current/hadoop-project-dist/hadoop-common/Compatibility.html#REST_APIs],
> which effectively means that ATSv1 has already been declared as a stable API.
> Clarify this by patching the compatibility document appropriately
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