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https://issues.apache.org/jira/browse/HADOOP-18653?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Shilun Fan updated HADOOP-18653:
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Component/s: common
> LogLevel servlet to determine log impl before using setLevel
> ------------------------------------------------------------
>
> Key: HADOOP-18653
> URL: https://issues.apache.org/jira/browse/HADOOP-18653
> Project: Hadoop Common
> Issue Type: Sub-task
> Components: common
> Affects Versions: 3.4.0
> Reporter: Viraj Jasani
> Assignee: Viraj Jasani
> Priority: Major
> Labels: pull-request-available
> Fix For: 3.4.0
>
>
> LogLevel GET API is used to set log level for a given class name dynamically.
> While we have cleaned up the commons-logging references, it would be great to
> determine whether slf4j log4j adapter is in the classpath before allowing
> client to set the log level.
> Proposed changes:
> * Use slf4j logger factory to get the log reference for the given class name
> * Use generic utility to identify if the slf4j log4j adapter is in the
> classpath before using log4j API to update the log level
> * If the log4j adapter is not in the classpath, report error in the output
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