[jira] [Created] (HADOOP-18653) LogLevel servlet to determine log impl before using setLevel

["Viraj Jasani (Jira)" <ji...@apache.org>]

Viraj Jasani created HADOOP-18653:
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             Summary: 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
            Reporter: Viraj Jasani
            Assignee: Viraj Jasani


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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