当我从Oracle db导入表到hive时很好但是当我将数据从hive导出到db时我得到了错误。我正在执行休闲查询操作。
sqoop export
--connect jdbc:oracle:thin:@oragmp01prscan.enterprisenet.org:1521/GMP1PROD_RLB
--username GMPAPMETA
--password welcome123
--table activity/
--export-dir hdfs://user/hive/warehouse/activity/
ERROR：
at org.apache.sqoop.tool.ExportTool.run(ExportTool.java:100)
at org.apache.sqoop.Sqoop.run(Sqoop.java:143)
at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:70)
at org.apache.sqoop.Sqoop.runSqoop(Sqoop.java:179)
at org.apache.sqoop.Sqoop.runTool(Sqoop.java:218)
at org.apache.sqoop.Sqoop.runTool(Sqoop.java:227)
at org.apache.sqoop.Sqoop.main(Sqoop.java:236)
15/11/05 01:18:28 ERROR tool.ExportTool:
Encountered IOException running export job:
java.io.IOException: No columns to generate for ClassWriter