zentol commented on a change in pull request #11073: [FLINK-15672][build] 
Migrate to log4j2 
URL: https://github.com/apache/flink/pull/11073#discussion_r381387137
 
 

 ##########
 File path: 
flink-connectors/flink-connector-kafka-0.10/src/test/resources/log4j2-test.properties
 ##########
 @@ -18,13 +18,21 @@
 
 # Set root logger level to OFF to not flood build logs
 # set manually to INFO for debugging purposes
-log4j.rootLogger=OFF, testlogger
+rootLogger.level = OFF
+rootLogger.appenderRef.test.ref = TestLogger
 
-# A1 is set to be a ConsoleAppender.
-log4j.appender.testlogger=org.apache.log4j.ConsoleAppender
-log4j.appender.testlogger.target = System.err
-log4j.appender.testlogger.layout=org.apache.log4j.PatternLayout
-log4j.appender.testlogger.layout.ConversionPattern=%-4r [%t] %-5p %c %x - %m%n
+appender.testlogger.name = TestLogger
+appender.testlogger.type = CONSOLE
+appender.testlogger.target = SYSTEM_ERR
+appender.testlogger.layout.type = PatternLayout
+appender.testlogger.layout.pattern = %-4r [%t] %-5p %c %x - %m%n
 
-# suppress the irrelevant (wrong) warnings from the netty channel handler
-log4j.logger.org.jboss.netty.channel.DefaultChannelPipeline=ERROR, testlogger
+logger.kafka.name = kafka
+logger.kafka.level = OFF
+logger.kafka2.name = state.change
+logger.kafka2.level = OFF
+
+logger.zookeeper.name = org.apache.zookeeper
+logger.zookeeper.level = OFF
+logger.I0Itec.name = org.I0Itec
 
 Review comment:
   oh, actually, I noticed this while trying things out. I0Itec is effectively 
part of ZK; for which we disabled logging, so I also disabled logging for 
I0Itec.
   You get message like this:
   ```
   INFO  org.I0Itec.zkclient.ZkEventThread [] - Starting ZkClient event thread.
   ```
   As such, I'll keep it as is.

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