sqoop db2 java.io.CharConversionException

最新推荐文章于 2022-08-01 18:38:45 发布

weixin_33743703

最新推荐文章于 2022-08-01 18:38:45 发布

阅读量1.9k

点赞数 3

CC 4.0 BY-SA版权

文章标签： java 大数据 python

原文链接：https://my.oschina.net/u/2511922/blog/784844

本文解决了一个使用SQOOP从DB2数据库抽取数据时遇到的问题，当遇到包含无效UTF-8字符串的字符列时，会抛出包含Caught java.io.CharConversionException的SQL异常。通过更新JDBC驱动并配置属性`db2.jcc.charsetDecoderEncoder=3`，成功解决了该问题。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

2019独角兽企业重金招聘Python工程师标准>>>

原本用sqoop从db2的抽数脚本忽然提示错误，如下

16/11/09 15:37:53 INFO mapreduce.Job: Task Id : attempt_1472462720075_14348_m_000004_0, Status : FAILED
Error: java.io.IOException: SQLException in nextKeyValue
   at org.apache.sqoop.mapreduce.db.DBRecordReader.nextKeyValue(DBRecordReader.java:266)
   at org.apache.hadoop.mapred.MapTask$NewTrackingRecordReader.nextKeyValue(MapTask.java:553)
   at org.apache.hadoop.mapreduce.task.MapContextImpl.nextKeyValue(MapContextImpl.java:80)
   at org.apache.hadoop.mapreduce.lib.map.WrappedMapper$Context.nextKeyValue(WrappedMapper.java:91)
   at org.apache.hadoop.mapreduce.Mapper.run(Mapper.java:144)
   at org.apache.sqoop.mapreduce.AutoProgressMapper.run(AutoProgressMapper.java:64)
   at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:784)
   at org.apache.hadoop.mapred.MapTask.run(MapTask.java:341)
   at org.apache.hadoop.mapred.YarnChild$2.run(YarnChild.java:163)
   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:1628)
   at org.apache.hadoop.mapred.YarnChild.main(YarnChild.java:158)
Caused by: com.ibm.db2.jcc.am.SqlException: [jcc][t4][1065][12306][4.16.53] 捕获到 java.io.CharConversionException。有关详细信息，请参阅相连接的 Throwable。 ERRORCODE=-4220, SQLSTATE=null
   at com.ibm.db2.jcc.am.fd.a(fd.java:723)
   at com.ibm.db2.jcc.am.fd.a(fd.java:60)
   at com.ibm.db2.jcc.am.fd.a(fd.java:112)
   at com.ibm.db2.jcc.am.jc.a(jc.java:2870)
   at com.ibm.db2.jcc.am.jc.p(jc.java:527)
   at com.ibm.db2.jcc.am.jc.N(jc.java:1563)
   at com.ibm.db2.jcc.am.ResultSet.getStringX(ResultSet.java:1153)
   at com.ibm.db2.jcc.am.ResultSet.getString(ResultSet.java:1128)
   at org.apache.sqoop.lib.JdbcWritableBridge.readString(JdbcWritableBridge.java:71)
   at com.cloudera.sqoop.lib.JdbcWritableBridge.readString(JdbcWritableBridge.java:61)
   at QueryResult.readFields(QueryResult.java:210)
   at org.apache.sqoop.mapreduce.db.DBRecordReader.nextKeyValue(DBRecordReader.java:246)
   ... 12 more
Caused by: java.nio.charset.MalformedInputException: Input length = 67277
   at com.ibm.db2.jcc.am.r.a(r.java:19)
   at com.ibm.db2.jcc.am.jc.a(jc.java:2862)
   ... 20 more
Caused by: sun.io.MalformedInputException
   at sun.io.ByteToCharUTF8.convert(ByteToCharUTF8.java:105)
   at com.ibm.db2.jcc.am.r.a(r.java:16)
   ... 21 more

大概的原因如下:

When an application uses the IBM Data Server Driver for JDBC and SQLJ (also known as the JCC driver) and is connected to a database with code set UTF-8 (code page 1208), it throws an
SqlException with message including "Caught java.io.CharConversionException" and ERRORCODE=-4220 if the data in a character column that it queries contains a sequence of bytes that is not a valid UTF-8 string.

解决如下：

下载对应版本的最新jdbc驱动包

http://www-01.ibm.com/support/docview.wss?uid=swg21363866

可在程序中添加

System.setProperty("db2.jcc.charsetDecoderEncoder", "3");

或

java -Ddb2.jcc.charsetDecoderEncoder=3 MyApp

因为当前的作业使用的mr来运行，所以在mapred-site.xml中做如下修改即可:

<property>
<name>mapreduce.map.java.opts</name>
<value>-Xmx1024m -Ddb2.jcc.charsetDecoderEncoder=3</value>
</property>

修改后无需重启集群

转载于:https://my.oschina.net/u/2511922/blog/784844