[jira] [Created] (KYLIN-3773) Using Mysql instead of Hive as Data Source fails with LinkageError

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

Hubert STEFANI created KYLIN-3773:
-------------------------------------

             Summary: Using Mysql instead of Hive as Data Source fails with LinkageError
                 Key: KYLIN-3773
                 URL: https://issues.apache.org/jira/browse/KYLIN-3773
             Project: Kylin
          Issue Type: Bug
          Components: RDBMS Source
    Affects Versions: v2.6.0
            Reporter: Hubert STEFANI


we are currently trying to test the KYLIN-3552 feature to rely directly on Mysql for data source instead of Hive.
 
(we tried as much as possible to add correct info in kylin.properties, add mysql jdbc drivers, create mysql.xml in ./conf/datasources ... as mentioned in [https://github.com/apache/kylin/pull/327/files] )

 
 
 
the error we entountered is ( excerpt from kylin.log ) :
 
 
2019-01-14 09:48:16,223 WARN  [http-bio-7070-exec-2] extensible.JdbcSource:50 : DataSource cannot be connected. This may not be required in a MapReduce job.
java.lang.LinkageError: loader constraint violation: loader (instance of sun/misc/Launcher$AppClassLoader) previously initiated loading for a different type with name "org/apache/kylin/common/KylinConfig"
        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:349)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
        at org.apache.kylin.sdk.datasource.framework.SourceConnectorFactory.getJdbcConnector(SourceConnectorFactory.java:27)


with further trace :
2019-01-14 09:48:16,229 ERROR [http-bio-7070-exec-2] controller.TableController:197 : 
java.lang.NullPointerException
        at org.apache.kylin.source.jdbc.extensible.JdbcExplorer.listDatabases(JdbcExplorer.java:58)
        at org.apache.kylin.rest.service.TableService.getSourceDbNames(TableService.java:280)
        at org.apache.kylin.rest.controller.TableController.showHiveDatabases(TableController.java:195)
 
 
the properties we use in kylin.properties are :
 
# NOVAGEN -- CUSTOM CONFIGURATION FOR MYSQL AS SOURCE
kylin.source.jdbc.connection-url=jdbc:mysql://ip-172-31-36-94.eu-west-1.compute.internal:3306/decat
kylin.source.jdbc.driver=com.mysql.jdbc.Driver
kylin.source.jdbc.dialect=mysql
kylin.source.jdbc.user=root
kylin.source.jdbc.pass=
kylin.query.pushdown.runner-class-name=org.apache.kylin.query.pushdown.PushdownRunnerSDKImpl
kylin.source.default=16
kylin.source.jdbc.sqoop-home=/usr/bin
kylin.source.jdbc.adaptor=org.apache.kylin.sdk.datasource.adaptor.MysqlAdaptor
 



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