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https://issues.apache.org/jira/browse/HADOOP-14213?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15937798#comment-15937798
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Jonathan Eagles commented on HADOOP-14213:
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To elaborate on the precedence, currently the final parameters of
core-default.xml and core-site.xml take precedence over hadoop-site.xml and
this patch preserves that ordering. It is correct that the hadoop-site.xml
configs will override for non-final parameters. That behavior is preserved as
well.
> Move Configuration runtime check for hadoop-site.xml to initialization
> ----------------------------------------------------------------------
>
> Key: HADOOP-14213
> URL: https://issues.apache.org/jira/browse/HADOOP-14213
> Project: Hadoop Common
> Issue Type: Improvement
> Reporter: Jonathan Eagles
> Assignee: Jonathan Eagles
> Attachments: HADOOP-14213.1.patch, HADOOP-14213.2.patch
>
>
> Each Configuration object that loads defaults checks for hadoop-site.xml. It
> has been long deprecated and is not present in most if not nearly all
> installations. The getResource check for hadoop-site.xml has to check the
> entire classpath since it is not found. This jira proposes to 1) either
> remove hadoop-site.xml as a default resource or 2) move the check to static
> initialization of the class so the performance hit is only taken once.
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