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From "Larry McCay (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-15357) Configuration.getPropsWithPrefix no longer does variable substitution
Date Mon, 02 Apr 2018 18:50:00 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-15357?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16422962#comment-16422962
] 

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

Hi [~Jim_Brennan] - this definitely is an oversight in the replacement of the iterator based
implementation and was not done intentionally.

Is it possible to add the missing functionality without reverting the thread safety added
by this change?

> 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
>            Priority: Major
>
> 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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