kyoty opened a new issue #5808: URL: https://github.com/apache/dolphinscheduler/issues/5808
**Describe the bug** When we try to transfer data using datax between different types of data sources, the worker will exit with ClassCastException  ```java [INFO] 2021-07-12 23:36:28.682 - [taskAppId=TASK-545173233664_3-3-3]:[464] - try to execute sql analysis query column name [ERROR] 2021-07-12 23:36:28.688 org.apache.dolphinscheduler.server.worker.runner.TaskExecuteThread:[171] - task scheduler failure java.lang.RuntimeException: java.lang.ClassCastException: org.apache.dolphinscheduler.common.datasource.clickhouse.ClickhouseConnectionParam cannot be cast to org.apache.dolphinscheduler.common.datasource.mysql.MysqlConnectionParam at org.apache.dolphinscheduler.common.datasource.DatasourceUtil.getConnection(DatasourceUtil.java:84) at org.apache.dolphinscheduler.server.worker.task.datax.DataxTask.tryExecuteSqlResolveColumnNames(DataxTask.java:557) at org.apache.dolphinscheduler.server.worker.task.datax.DataxTask.parsingSqlColumnNames(DataxTask.java:465) at org.apache.dolphinscheduler.server.worker.task.datax.DataxTask.buildDataxJobContentJson(DataxTask.java:286) at org.apache.dolphinscheduler.server.worker.task.datax.DataxTask.buildDataxJsonFile(DataxTask.java:215) at org.apache.dolphinscheduler.server.worker.task.datax.DataxTask.handle(DataxTask.java:166) at org.apache.dolphinscheduler.server.worker.runner.TaskExecuteThread.run(TaskExecuteThread.java:159) at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) at java.util.concurrent.FutureTask.run$$$capture(FutureTask.java:266) at java.util.concurrent.FutureTask.run(FutureTask.java) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) at java.lang.Thread.run(Thread.java:748) Caused by: java.lang.ClassCastException: org.apache.dolphinscheduler.common.datasource.clickhouse.ClickhouseConnectionParam cannot be cast to org.apache.dolphinscheduler.common.datasource.mysql.MysqlConnectionParam at org.apache.dolphinscheduler.common.datasource.mysql.MysqlDatasourceProcessor.getConnection(MysqlDatasourceProcessor.java:113) at org.apache.dolphinscheduler.common.datasource.DatasourceUtil.getConnection(DatasourceUtil.java:82) ... 12 common frames omitted ``` **Which version of Dolphin Scheduler:** latest dev **Additional context** Add any other context about the problem here. **Requirement or improvement** - Please describe about your requirements or improvement suggestions. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
