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https://issues.apache.org/jira/browse/HADOOP-14216?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15939398#comment-15939398
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Jonathan Eagles commented on HADOOP-14216:
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Regarding xi:include xi:fallback, this was never a documented feature that I
could find and no tests proved continued support. Through using the underlying
xerces2 xml parser, the xml extension https://www.w3.org/TR/xinclude/ was
however available and examples were found to be using this feature. Stax
parser, by design or maturity, don't support Xinclude. It was mostly trivial to
implement. The essential feature is that xi:include statements xml inine
statements. Thus, the source remains the same. xi:fallback statements are not
used unless the xi:include fetch fails. Finals in xi:include statements
preclude being overridden in the remaining document, but not final
configuration can be overridden in the remaining document. If a fetch fails on
an xi:include statement and no fallback is found, then that is a fatal error.
> Improve Configuration XML Parsing Performance
> ---------------------------------------------
>
> Key: HADOOP-14216
> URL: https://issues.apache.org/jira/browse/HADOOP-14216
> Project: Hadoop Common
> Issue Type: Improvement
> Reporter: Jonathan Eagles
> Assignee: Jonathan Eagles
> Attachments: HADOOP-14216.1.patch
>
>
> JIRA is to improve XML parsing performance through reuse and a change in XML
> parser (STAX)
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