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 -- This message was sent by Atlassian JIRA (v7.6.3#76005)