学习hadoop遇到的问题（sqoop2报org.codehaus.jackson.map.JsonMappingException）

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#学习大数据遇到的问题（bug） #学习大数据遇到的问题（bug）

本文解决了CDH中Sqoop2遇到的Jackson依赖错误，通过创建软链接到正确的Jackson库版本，成功修复了问题并指导如何重启Sqoop2。

 这是CDH本身的bug

解决办法：

cd /opt/cloudera/parcels/CDH/lib/hadoop/client
sudo ln -s ../../hadoop-hdfs/lib/jackson-mapper-asl-1.8.8.jar
sudo ln -s ../../hadoop-hdfs/lib/jackson-core-asl-1.8.8.jar

在重新启动sqoop2

 

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package com.edu.test; import com.edu.po.Person; import com.edu.utils.HiveUtils; import com.edu.utils.JdbcUtils; import java.sql.Connection; import java.sql.PreparedStatement; import java.sql.ResultSet; import java.sql.SQLException; import java.util.ArrayList; import java.util.List; /* * 任务说明: * 1. 把 hive 的表读取出来。 * 2. 把数据转入到 mysql。 * 3. 可以在 web 工程中读取 mysql 数据。 * (web 工程有 jar 冲突问题, 这里间接去读取 hive 数据) * 4. 展示在页面。 */ public class Task1 { /* 数据项: [day_time], [total_msg_cnt] */ static List<Person> getHiveData() throws SQLException { Connection conn = HiveUtils.getConnection(); String SQL = "select * from total_msg_cnt"; PreparedStatement psmt = conn.prepareStatement(SQL); ResultSet rs = psmt.executeQuery(); List<Person> list = new ArrayList(); while( rs.next() ){ Person p = packPerson( rs ); list.add( p ); System.out.println( p ); } rs.close(); psmt.close(); HiveUtils.closeConnection(); //关闭 hive 连接 System.out.println("+-----------------------------------+"); System.out.println("{TASK1-HIVE}运行完成.."); System.out.println("+-----------------------------------+"); return list; } static Person packPerson(ResultSet rs) throws SQLException { Person p = new Person(); String day_time = rs.getString(1); Long total_msg_cnt = rs.getLong(2); p.setDay_time( day_time ); p.setTotal_msg_cnt( total_msg_cnt ); return p; } public static void main(String[] args) throws SQLException { List<Person> hiveData = getHiveData(); //2.转存到 MYSQL 中。 writeToMYSQL(hiveData); } /* 2.转存到 MYSQL 中。 */ static void writeToMYSQL(List<Person> hiveData) throws SQLException { // 1. 获取 MySQL 连接 Connection conn = JdbcUtils.getConnection(); String SQL = "INSERT INTO total_msg_cnt (day_time, total_msg_cnt) VALUES (?, ?)"; PreparedStatement psmt = conn.prepareStatement(SQL); for (Person p : hiveData) { psmt.setString(1, p.getDay_time()); psmt.setLong(2, p.getTotal_msg_cnt()); psmt.addBatch(); } psmt.executeBatch(); psmt.close(); JdbcUtils.closeConnection(); System.out.println("+-----------------------------------+"); System.out.println("{TASK1-MYSQL}运行完成."); System.out.println("+-----------------------------------+"); } } D:\flinkjava\Java\jdk1.8.0_281\bin\java.exe "-javaagent:D:\jetbra\IntelliJ IDEA 2023.2.8\lib\idea_rt.jar=50358:D:\jetbra\IntelliJ IDEA 2023.2.8\bin" -Dfile.encoding=UTF-8 -classpath 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jar;C:\Users\sb171\.m2\repository\org\apache\thrift\libthrift\0.9.3\libthrift-0.9.3.jar;C:\Users\sb171\.m2\repository\org\apache\zookeeper\zookeeper\3.4.6\zookeeper-3.4.6.jar;C:\Users\sb171\.m2\repository\org\slf4j\slf4j-log4j12\1.6.1\slf4j-log4j12-1.6.1.jar;C:\Users\sb171\.m2\repository\log4j\log4j\1.2.16\log4j-1.2.16.jar;C:\Users\sb171\.m2\repository\io\netty\netty\3.7.0.Final\netty-3.7.0.Final.jar;C:\Users\sb171\.m2\repository\org\apache\curator\curator-framework\2.12.0\curator-framework-2.12.0.jar;C:\Users\sb171\.m2\repository\org\apache\curator\curator-client\2.12.0\curator-client-2.12.0.jar;C:\Users\sb171\.m2\repository\org\slf4j\slf4j-api\1.7.10\slf4j-api-1.7.10.jar;C:\Users\sb171\.m2\repository\org\apache\hive\hive-upgrade-acid\3.1.2\hive-upgrade-acid-3.1.2.jar;C:\Users\sb171\.m2\repository\mysql\mysql-connector-java\8.0.30\mysql-connector-java-8.0.30.jar;C:\Users\sb171\.m2\repository\com\google\protobuf\protobuf-java\3.19.4\protobuf-java-3.19.4.jar com.edu.test.Task1 Person{day_time=null, total_msg_cnt='3735'} +-----------------------------------+ {TASK1-HIVE}运行完成.. +-----------------------------------+ Exception in thread "main" java.sql.BatchUpdateException: Column 'day_time' cannot be null at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) at java.lang.reflect.Constructor.newInstance(Constructor.java:423) at com.mysql.cj.util.Util.handleNewInstance(Util.java:192) at com.mysql.cj.util.Util.getInstance(Util.java:167) at com.mysql.cj.util.Util.getInstance(Util.java:174) at com.mysql.cj.jdbc.exceptions.SQLError.createBatchUpdateException(SQLError.java:224) at com.mysql.cj.jdbc.ClientPreparedStatement.executeBatchSerially(ClientPreparedStatement.java:816) at com.mysql.cj.jdbc.ClientPreparedStatement.executeBatchInternal(ClientPreparedStatement.java:418) at com.mysql.cj.jdbc.StatementImpl.executeBatch(StatementImpl.java:795) at com.edu.test.Task1.writeToMYSQL(Task1.java:77) at com.edu.test.Task1.main(Task1.java:61) Caused by: java.sql.SQLIntegrityConstraintViolationException: Column 'day_time' cannot be null at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:117) at com.mysql.cj.jdbc.exceptions.SQLExceptionsMapping.translateException(SQLExceptionsMapping.java:122) at com.mysql.cj.jdbc.ClientPreparedStatement.executeInternal(ClientPreparedStatement.java:916) at com.mysql.cj.jdbc.ClientPreparedStatement.executeUpdateInternal(ClientPreparedStatement.java:1061) at com.mysql.cj.jdbc.ClientPreparedStatement.executeBatchSerially(ClientPreparedStatement.java:795) ... 4 more Process finished with exit code 1
最新发布
06-30
如果使用 Sqoop 将数据从 Hive 导出到 MySQL，可以在 Sqoop 命令中添加 `--map-column-java` 参数指定字段类型，并结合 `--query` 处理空值。例如： ```bash sqoop export \ --connect jdbc:mysql://localhost:3306...
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weixin_30767921的博客
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一个新项目需要用到jackson，就从另一个项目拷贝jackson的jar包，开始只是拷贝了几个名称包括jackson的jar包（原项目jar包非常多），发现编译没错误，但运行时报无法找到这个类那个类等等。现将所有依赖的jackson的jar列出来，以备后用。 具体包共享在百度圆盘上：http://pan.baidu.com/s/1c0LKdxe Jackson包对json的使...
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在用jackson-core-asl-1.9.10.jar和jackson-mapper-asl-1.9.10.jar两个包做json字符串转换Pojo对象时报如下异常： org.codehaus.jackson.map.JsonMappingException: Can not deserialize instance of java.util.List out of START_OBJE
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