我正在尝试使用sqoop将Parquet文件表单s3导出到sql server，出现以下错误：
19/07/09 16:12:57错误sqoop.sqoop:运行sqoop时出现异常：org.kitesdk.data.datasetnotfoundexception:未知的数据集uri模式：dataset:s3用法：/mybucket/data lake/serving zone/part-00002-b5a1da42.snappy.parquet检查s3数据集的jar是否在类路径org.kitesdk.data.datasetnotfoundexception:未知的数据集uri模式：dataset:s3用法：/mybucket/data lake/serving zone/part-00002-b5a1da42.snappy.parquet检查s3数据集的jar是否位于org.kitesdk.data.spi.registration.lookupdateaseturi（registration）的类路径上。java:128)在org.kitesdk.data.datasets.load（datasets。java:103)在org.kitesdk.data.datasets.load（datasets。java:140)在org.kitesdk.data.mapreduce.datasetkeyinputformat$configbuilder.readfrom（datasetkeyinputformat）。java:92)位于org.kitesdk.data.mapreduce.datasetkeyinputformat$configbuilder.readfrom（datasetkeyinputformat）。java:139)位于org.apache.sqoop.mapreduce.jdbcexportjob.configureinputformat（jdbcexportjob）。java:83)在org.apache.sqoop.mapreduce.exportjobbase.runexport（exportjobbase。java:434)位于org.apache.sqoop.manager.sqlservermanager.exporttable（sqlservermanager。java:192)在org.apache.sqoop.tool.exporttool.exporttable（exporttool。java:80)在org.apache.sqoop.tool.exporttool.run（exporttool。java:99)在org.apache.sqoop.sqoop.run（sqoop。java:147)在org.apache.hadoop.util.toolrunner.run（toolrunner。java:76)在org.apache.sqoop.sqoop.runsqoop（sqoop。java:183)在org.apache.sqoop.sqoop.runtool（sqoop。java:234)在org.apache.sqoop.sqoop.runtool（sqoop。java:243)在org.apache.sqoop.sqoop.main（sqoop。java:252)
数据集存在于上述位置，路径uri没有问题。我试着从同一路径导出一个csv文件，结果成功了。
下面是我的sqoop导出命令：

sqoop export --driver com.microsoft.sqlserver.jdbc.SQLServerDriver 
             --connection-manager org.apache.sqoop.manager.SQLServerManager 
             --connect "jdbc:sqlserver://localhost:1433;databaseName=salesdb"  
             --table DimEmployee_test --num-mappers 128 
             --export-dir s3://mybucket/data-lake/serving-zone/part-00002-b5a1da42.snappy.parquet
             --username db-user --password mypassword