[jira] [Created] (KYLIN-2699) Tomcat LinkageError for curator-client jar file conflict

["qiumingming (JIRA)" <ji...@apache.org>]

qiumingming created KYLIN-2699:
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             Summary: Tomcat LinkageError for curator-client jar file conflict
                 Key: KYLIN-2699
                 URL: https://issues.apache.org/jira/browse/KYLIN-2699
             Project: Kylin
          Issue Type: Bug
          Components: Job Engine, Web 
    Affects Versions: v2.0.0
            Reporter: qiumingming
            Assignee: Dong Li


Exception: java.lang.LinkageError: loader constraint violation: loader (instance of sun/misc/Launcher$AppClassLoader) previously initiated loading for a different type with name "org/apache/curator/RetryPolicy"
        at java.lang.ClassLoader.defineClass1(Native Method)
        at java.lang.ClassLoader.defineClass(ClassLoader.java:763)
        at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
        at java.net.URLClassLoader.defineClass(URLClassLoader.java:467)
        at java.net.URLClassLoader.access$100(URLClassLoader.java:73)
        at java.net.URLClassLoader$1.run(URLClassLoader.java:368)
        at java.net.URLClassLoader$1.run(URLClassLoader.java:362)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:361)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
        at org.apache.curator.CuratorZookeeperClient.<init>(CuratorZookeeperClient.java:97)
        at org.apache.curator.framework.imps.CuratorFrameworkImpl.<init>(CuratorFrameworkImpl.java:108)
        at org.apache.curator.framework.CuratorFrameworkFactory$Builder.build(CuratorFrameworkFactory.java:124)
        at org.apache.kylin.storage.hbase.util.ZookeeperJobLock.lock(ZookeeperJobLock.java:70)
        at org.apache.kylin.job.impl.threadpool.DefaultScheduler.init(DefaultScheduler.java:208)
        at org.apache.kylin.rest.service.JobService$1.run(JobService.java:116)
        at java.lang.Thread.run(Thread.java:745)

This exception will make kylin job engine does not work. And I found it occured because in the kylin/WEB-INF/lib contains the curator-client-2.7.1.jar which make some conflicts. In general, the HBase and Hadoop cluster always contain their own curator-client jar files. So there is no need to include the  curator-client jar file in kylin/WEB-INF/lib.



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