[jira] [Created] (FLINK-20404) ZooKeeper quorum fails to start due to missing log4j library

["Pedro Miguel Rainho Chaves (Jira)" <ji...@apache.org>]

Pedro Miguel Rainho Chaves created FLINK-20404:
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             Summary: ZooKeeper quorum fails to start due to missing log4j library
                 Key: FLINK-20404
                 URL: https://issues.apache.org/jira/browse/FLINK-20404
             Project: Flink
          Issue Type: Bug
    Affects Versions: 1.11.2
            Reporter: Pedro Miguel Rainho Chaves


Upon starting a zookeeper quorum using flink's bootstrapped zookeeper, it throws the following exception.

 
{code:java}
2020-11-27 13:13:38,371 ERROR org.apache.flink.runtime.zookeeper.FlinkZooKeeperQuorumPeer  [] - Error running ZooKeeper quorum peer: org/apache/log4j/jmx/HierarchyDynamicMBean
java.lang.NoClassDefFoundError: org/apache/log4j/jmx/HierarchyDynamicMBean
        at org.apache.flink.shaded.zookeeper3.org.apache.zookeeper.jmx.ManagedUtil.registerLog4jMBeans(ManagedUtil.java:51) ~[flink-shaded-zookeeper-3.4.14.jar:3.4.14-11.0]
        at org.apache.flink.shaded.zookeeper3.org.apache.zookeeper.server.quorum.QuorumPeerMain.runFromConfig(QuorumPeerMain.java:125) ~[flink-shaded-zookeeper-3.4.14.jar:3.4.14-11.0]
        at org.apache.flink.runtime.zookeeper.FlinkZooKeeperQuorumPeer.runFlinkZkQuorumPeer(FlinkZooKeeperQuorumPeer.java:123) ~[flink-dist_2.11-1.11.2.jar:1.11.2]
        at org.apache.flink.runtime.zookeeper.FlinkZooKeeperQuorumPeer.main(FlinkZooKeeperQuorumPeer.java:79) [flink-dist_2.11-1.11.2.jar:1.11.2]
Caused by: java.lang.ClassNotFoundException: org.apache.log4j.jmx.HierarchyDynamicMBean
        at java.net.URLClassLoader.findClass(URLClassLoader.java:382) ~[?:1.8.0_262]
        at java.lang.ClassLoader.loadClass(ClassLoader.java:418) ~[?:1.8.0_262]
        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:352) ~[?:1.8.0_262]
        at java.lang.ClassLoader.loadClass(ClassLoader.java:351) ~[?:1.8.0_262]
        ... 4 more
{code}
This happens because the new flink version is missing a log4j library. This can be solved by adding log4j-1.2.17.jar to the classpath, nonetheless the bootstrapped zookeepeer version should be compatible with the log4j2 libraries that come with flink's default installation.

 

*Steps to reproduce:*
 # Fresh install of flink version 1.11.2 
 # Change the zookeeper config to start as a quorum
{code:java}
server.1=<hostname>:2888:3888
server.2=<hostname>:2888:3888{code}

 # Start zookeeper
 # <installation_path>/bin/zookeeper.sh start-foreground 1



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