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From "Larry McCay (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-15357) Configuration.getPropsWithPrefix no longer does variable substitution
Date Fri, 06 Apr 2018 18:08:00 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-15357?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16428702#comment-16428702
] 

Larry McCay commented on HADOOP-15357:
--------------------------------------

I supposed the fact that get() is already tested for deprecated keys is likely enough coverage
for this as well.

LGTM +1

> Configuration.getPropsWithPrefix no longer does variable substitution
> ---------------------------------------------------------------------
>
>                 Key: HADOOP-15357
>                 URL: https://issues.apache.org/jira/browse/HADOOP-15357
>             Project: Hadoop Common
>          Issue Type: Bug
>            Reporter: Jim Brennan
>            Assignee: Jim Brennan
>            Priority: Major
>         Attachments: HADOOP-15357.001.patch, HADOOP-15357.002.patch, HADOOP-15357.003.patch
>
>
> Before [HADOOP-13556], Configuration.getPropsWithPrefix() used the Configuration.get()
method to get the value of the variables.   After [HADOOP-13556], it now uses props.getProperty().
> The difference is that Configuration.get() does deprecation handling and more importantly
variable substitution on the value.  So if a property has a variable specified with ${variable_name},
it will no longer be expanded when retrieved via getPropsWithPrefix().
> Was this change in behavior intentional?  I am using this function in the fix for [MAPREDUCE-7069],
but we do want variable expansion to happen.



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