解决sqoop报错Invalid number; item = ITEM_UNICODE

报错栈：

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)

问题的根本原因是字段值类型异常，本来应该是数字型，里面却存了unicode字符。使用报错信息查不到相关资料，另外增加参数也不能解决：-D mapreduce.map.failures.maxpercent=1， query里面增加： and Specimen is not null 也不能解决。（Specimen是报错字段）。

靠谱的解决办法是找出这行异常数据，在数据库中纠正或删除。如果想临时解决，可以把这个字段在导入时转换类型为字符：--map-column-java Specimen=String。