用CDH自带的sqoop，把hive的数据导入到sqoop，发生java.lang.NumberFormatException异常

在Yarn查找到详细日志如下：

java.lang.NumberFormatException
	at java.math.BigDecimal.<init>(BigDecimal.java:494)
	at java.math.BigDecimal.<init>(BigDecimal.java:383)
	at java.math.BigDecimal.<init>(BigDecimal.java:806)
	at org.apache.sqoop.mapreduce.hcat.SqoopHCatExportHelper.convertStringTypes(SqoopHCatExportHelper.java:271)
	at org.apache.sqoop.mapreduce.hcat.SqoopHCatExportHelper.convertToSqoop(SqoopHCatExportHelper.java:211)
	at org.apache.sqoop.mapreduce.hcat.SqoopHCatExportHelper.convertToSqoopRecord(SqoopHCatExportHelper.java:134)
	at org.apache.sqoop.mapreduce.hcat.SqoopHCatExportMapper.map(SqoopHCatExportMapper.java:56)
	at org.apache.sqoop.mapreduce.hcat.SqoopHCatExportMapper.map(SqoopHCatExportMapper.java:35)
	at org.apache.hadoop.mapreduce.Mapper.run(Mapper.java:146)
	at org.apache.sqoop.mapreduce.AutoProgressMapper.run(AutoProgressMapper.java:64)
	at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:799)
	at org.apache.hadoop.mapred.MapTask.run(MapTask.java:347)
	at org.apache.hadoop.mapred.YarnChild$2.run(YarnChild.java:174)
	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:1875)
	at org.apache.hadoop.mapred.YarnChild.main(YarnChild.java:168)

想到可能是定义的mysql表结构，Decimal类型转化出问题。有可能是decimal没有定义精度，尝试先改为string类型，再用sqoop导入hive到mysql中，一切正常，在mysql也顺利看到数据了。

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