[ 
https://issues.apache.org/jira/browse/HADOOP-18207?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17725029#comment-17725029
 ] 

ASF GitHub Bot commented on HADOOP-18207:
-----------------------------------------

virajjasani commented on code in PR #5503:
URL: https://github.com/apache/hadoop/pull/5503#discussion_r1200771313


##########
hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/conf/TestConfiguration.java:
##########
@@ -220,27 +219,21 @@ public void testFinalWarnings() throws Exception {
     InputStream in2 = new ByteArrayInputStream(bytes2);
 
     // Attach our own log appender so we can verify output
-    TestAppender appender = new TestAppender();
-    final Logger logger = Logger.getRootLogger();
-    logger.addAppender(appender);
+    LogCapturer logCapturer = 
LogCapturer.captureLogs(LoggerFactory.getLogger("root"));

Review Comment:
   also, here is the impl of setLogLevel with this PR:
   
   ```
     static void setLogLevel(String loggerName, String levelName) {
       if (loggerName == null) {
         throw new IllegalArgumentException("logger name cannot be null");
       }
       Logger logger = loggerName.equalsIgnoreCase("root") ?
           LogManager.getRootLogger() :
           LogManager.getLogger(loggerName);
       Level level = Level.toLevel(levelName.toUpperCase());
       if (!level.toString().equalsIgnoreCase(levelName)) {
         throw new IllegalArgumentException("Unsupported log level " + 
levelName);
       }
       logger.setLevel(level);
     }
   ```





> Introduce hadoop-logging module
> -------------------------------
>
>                 Key: HADOOP-18207
>                 URL: https://issues.apache.org/jira/browse/HADOOP-18207
>             Project: Hadoop Common
>          Issue Type: Sub-task
>            Reporter: Duo Zhang
>            Assignee: Viraj Jasani
>            Priority: Major
>              Labels: pull-request-available
>
> There are several goals here:
>  # Provide the ability to change log level, get log level, etc.
>  # Place all the appender implementation(?)
>  # Hide the real logging implementation.
>  # Later we could remove all the log4j references in other hadoop module.
>  # Move as much log4j usage to the module as possible.
>  



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