错误日志：
2017-04-24 16:51:10,638 INFO [AsyncDispatcher event handler] org.apache.hadoop.mapreduce.v2.app.job.impl.TaskAttemptImpl: Diagnostics report from attempt_1492673938247_0831_m_000002_0: Error: java.io.IOException: Can’t export data, please check failed map task logs
at org.apache.sqoop.mapreduce.TextExportMapper.map(TextExportMapper.java:122)
at org.apache.sqoop.mapreduce.TextExportMapper.map(TextExportMapper.java:39)
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$2.run(YarnChild.java:164)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:415)
at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1693)
at org.apache.hadoop.mapred.YarnChild.main(YarnChild.java:158)
Caused by: java.lang.RuntimeException: Can’t parse input data: ‘null’
at pro_supply_correct_error.__loadFromFields(pro_supply_correct_error.java:1109)
at pro_supply_correct_error.parse(pro_supply_correct_error.java:952)
at org.apache.sqoop.mapreduce.TextExportMapper.map(TextExportMapper.java:89)
… 10 more
Caused by: java.util.NoSuchElementException
at java.util.ArrayList$Itr.next(ArrayList.java:834)
at pro_supply_correct_error.__loadFromFields(pro_supply_correct_error.java:1104)
… 12 more
数据：
76888651~厂家直销860型彩钢瓦设备~41026516~建材生产加工机械~113175~122174~2015-04-27 09:43:52~1~1~-~2017-04-21 17:50:51~建筑、建材>钢格板~0.0~2~2~彩钢瓦设备~122146,131113106,122132103,122151,122144~建筑、建材>钢格板,冶金矿产>金属网>金属板网,建筑、建材>梯类>楼梯及配件,建筑、建材>网格板及格栅板,建筑、建材>金属建材~1.00,0.00,0.00,0.00,0.00~null~null~null
sqoop导出语句：
sqoop export –connect “jdbc:mysql://node1:3306/procorrect?useUnicode=true&characterEncoding=utf-8” –username bigdata –password bigdata99114 –table pro_supply_correct_error –export-dir /user/hive/warehouse/procorrect.db/pro_supply_correct_error –input-fields-terminated-by ‘~’ –update-key supply_id –update-mode allowinsert
错误原因：
hive表字段分隔符的问题，sqoop解析‘~’出现错误。
解决办法：
修改hive表字段分隔符为’\t’,然后sqoop导出语句改为
sqoop export –connect “jdbc:mysql://node1:3306/procorrect?useUnicode=true&characterEncoding=utf-8” –username bigdata –password bigdata99114 –table pro_supply_correct_error –export-dir /user/hive/warehouse/procorrect.db/pro_supply_correct_error –input-fields-terminated-by ‘\t’ –update-key supply_id –update-mode allowinsert