Hi Hubert,
Could you please provide your kylin.properties with prefix
“kylin.source.jdbc ” or just show your project configurations. I think it’s
easier to find the root cause.
Best Regards
Rongchuan.Jin
在 2019/1/14 下午9:24，“hubert stefani”<hubert_stef...@yahoo.fr.INVALID> 写入:
Hi,
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)
do you have any idea ?
Is there a User guide ?
