snleee commented on a change in pull request #4139: Migration to log4j2
URL: https://github.com/apache/incubator-pinot/pull/4139#discussion_r281811063
 
 

 ##########
 File path: 
pinot-common/src/main/java/org/apache/pinot/common/utils/ZkStarter.java
 ##########
 @@ -52,6 +52,10 @@ private ZookeeperInstance(PublicZooKeeperServerMain 
serverMain, String dataDirPa
     @Override
     public void initializeAndRun(String[] args)
         throws QuorumPeerConfig.ConfigException, IOException {
+      // org.apache.log4j.jmx.* is not compatible under log4j-1.2-api, which 
provides the backward compatibility for
+      // log4j 1.* api for log4j2. In order to avoid 'class not found error', 
the following line disables log4j jmx
+      // bean registration for local zookeeper instance
+      System.setProperty("zookeeper.jmx.log4j.disable", "true");
 
 Review comment:
   I think that we should still keep `log4j-1.2-api` since some of our 
dependencies are directly using log4j 1.x api. Zookeeper is still on log4j 1.x 
so using later version won't help here. There was some effort to do migration 
but the pr didn't get merged and closed. 
https://github.com/apache/zookeeper/pull/148

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