[HADOOP-18653] LogLevel servlet to determine log impl before using setLevel

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 3.4.0
• Fix Version/s: 3.4.0
• Component/s: common
• Labels: pull-request-available
• Target Version/s: 3.4.0
• Hadoop Flags: Reviewed
• Assignee: Viraj Jasani
• Reporter: Viraj Jasani
• Created: 06/Mar/23 06:03
• Updated: 27/Jan/24 08:36
• Resolved: 13/Mar/23 12:30

Description

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

Issue Links

• links to: GitHub Pull Request #5456