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https://issues.apache.org/jira/browse/HADOOP-15015?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16238777#comment-16238777
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Mingliang Liu commented on HADOOP-15015:
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+1
> TestConfigurationFieldsBase to use SLF4J for logging
> ----------------------------------------------------
>
> Key: HADOOP-15015
> URL: https://issues.apache.org/jira/browse/HADOOP-15015
> Project: Hadoop Common
> Issue Type: Bug
> Components: conf, test
> Affects Versions: 3.0.0
> Reporter: Steve Loughran
> Assignee: Steve Loughran
> Attachments: HADOOP-15015-001.patch
>
>
> {{TestConfigurationFieldsBase}} has a protected "configDebug" field used to
> turn logging on/off
> {code}
> if (configDebug) {
> System.out.println("Field: " + f);
> }
> {code}
> Presumably its there to allow people with code access to debug their classes.
> But if we switch to SLF4J you get controllable logging @ runtime.
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