報錯棧：

java.sql.SQLException: Invalid number; item = ITEM_UNICODE
    at com.intersys.jdbc.SysList.getInt(SysList.java:1735)
    at com.intersys.jdbc.CacheResultSet.getInt(CacheResultSet.java:247)
    at org.apache.sqoop.lib.JdbcWritableBridge.readInteger(JdbcWritableBridge.java:52)
    at com.cloudera.sqoop.lib.JdbcWritableBridge.readInteger(JdbcWritableBridge.java:
 
53)
    at QueryResult.readFields(QueryResult.java:246)
    at org.apache.sqoop.mapreduce.db.DBRecordReader.nextKeyValue(DBRecordReader.java:244)
    at org.apache.hadoop.mapred.MapTask$NewTrackingRecordReader.nextKeyValue(MapTask.java:556)
    at org.apache.hadoop.mapreduce.task.MapContextImpl.nextKeyValue(MapContextImpl.java:
 
80)
    at org.apache.hadoop.mapreduce.lib.map.WrappedMapper$Context.nextKeyValue(WrappedMapper.java:91)
    at org.apache.hadoop.mapreduce.Mapper.run(Mapper.java:145)
    at org.apache.sqoop.mapreduce.AutoProgressMapper.run(AutoProgressMapper.java:64)
    at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:
 
787)
    at org.apache.hadoop.mapred.MapTask.run(MapTask.java:341)
    at org.apache.hadoop.mapred.YarnChild$2.run(YarnChild.java:164)
    at java.security.AccessController.doPrivileged(Native Method)
    at javax.security.auth.Subject.doAs(Subject.java:422)
    at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1657)
    at org.apache.hadoop.mapred.YarnChild.main(YarnChild.java:158)

問題的根本原因是字段值類型異常，本來應該是數字型，裏面卻存了unicode字符。使用報錯信息查不到相關資料，另外增加參數也不能解決：-D mapreduce.map.failures.maxpercent=1， query裏面增加： and Specimen is not null 也不能解決。（Specimen是報錯字段）。

靠譜的解決辦法是找出這行異常數據，在數據庫中糾正或刪除。如果想臨時解決，可以把這個字段在導入時轉換類型為字符：--map-column-java Specimen=String。

解決sqoop報錯Invalid number; item = ITEM_UNICODE