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转载地址：http://blog.csdn.net/zhangzhaokun/article/details/44313531
（1）安装环境
操作系统：Linux（centos6.5）
JDK版本：1.7.0_45
Hadoop版本：hadoop2.2.0
Sqoop版本：sqoop-1.4.5.bin__hadoop-2.0.4-alpha.tar.gz
hadoop安装目录：/home/hadoop/hadoop-2.2.0
Sqoop2安装目录：/home/hadoop/sqoop-1.4.5
Hadoop和Sqoop都是同一个用户hadoop下面，hadoop用户的的家目录：/home/hadoop
2）修改Sqoop配置文件
cd /home/hadoop/sqoop-1.4.5/conf
cp sqoop-env-template.sh sqoop-env.sh
在文件sqoop-env.sh的末尾追加如下几个环境变量设置：
#add by zhanzk
export HADOOP_COMMON_HOME=/home/hadoop/hadoop-2.2.0
export HADOOP_MAPRED_HOME=/home/hadoop/hadoop-2.2.0/share/hadoop/mapreduce
export HIVE_HOME=/home/hadoop/hive-0.12.0
（3）修改hadoop用户的环境变量
编辑文件：/home/hadoop/.bash_profile，追加如下内容：
export SQOOP_HOME=/home/hadoop/sqoop-1.4.5
export PATH=$PATH:$SQOOP_HOME/bin
export LOGDIR=$SQOOP_HOME/logs
（4）将mysql的jdbc驱动程序放到$SQOOP_HOME/lib目录下
将 mysql-connector-java-5.1.15.jar 复制到 ：/home/hadoop/sqoop-1.4.5/lib目录下
（5）试用sqoop
1 、用Sqoop来列出192.168.0.1下的数据库
进入$SQOOP_HOME/bin目录下执行如下命令：
./sqoop list-databases --connect jdbc:mysql://192.168.0.1:3306/mydb?characterEncoding=UTF-8 --username test --password ‘test‘
2、将表book下的数据导入到HDFS中去
进入$SQOOP_HOME/bin目录下执行如下命令：
./sqoop import --connect jdbc:mysql://192.168.0.1:3306/mydb?characterEncoding=UTF-8 --username test --password ‘test‘ --target-dir ‘/user/hive/warehouse/book‘ --table book ;
注意：我么这里也出现问题了:
15/03/15 22:30:33 ERROR manager.SqlManager: Error reading from database: java.sql.SQLException: Streaming result set com.mysql.jdbc.RowDataDynamic@54b0a583 is still active. No statements may be issued when any streaming result sets are open and in use on a given connection. Ensure that you have called .close() on any active streaming result sets before attempting more queries.
java.sql.SQLException: Streaming result set com.mysql.jdbc.RowDataDynamic@54b0a583 is still active. No statements may be issued when any streaming result sets are open and in use on a given connection. Ensure that you have called .close() on any active streaming result sets before attempting more queries.
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:930)
at com.mysql.jdbc.MysqlIO.checkForOutstandingStreamingData(MysqlIO.java:2694)
at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1868)
at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2109)
at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2642)
at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2571)
at com.mysql.jdbc.StatementImpl.executeQuery(StatementImpl.java:1464)
at com.mysql.jdbc.ConnectionImpl.getMaxBytesPerChar(ConnectionImpl.java:3030)
at com.mysql.jdbc.Field.getMaxBytesPerCharacter(Field.java:592)
at com.mysql.jdbc.ResultSetMetaData.getPrecision(ResultSetMetaData.java:444)
at org.apache.sqoop.manager.SqlManager.getColumnInfoForRawQuery(SqlManager.java:285)
at org.apache.sqoop.manager.SqlManager.getColumnTypesForRawQuery(SqlManager.java:240)
at org.apache.sqoop.manager.SqlManager.getColumnTypes(SqlManager.java:226)
at org.apache.sqoop.manager.ConnManager.getColumnTypes(ConnManager.java:295)
at org.apache.sqoop.orm.ClassWriter.getColumnTypes(ClassWriter.java:1773)
at org.apache.sqoop.orm.ClassWriter.generate(ClassWriter.java:1578)
at org.apache.sqoop.tool.CodeGenTool.generateORM(CodeGenTool.java:96)
at org.apache.sqoop.tool.ImportTool.importTable(ImportTool.java:478)
at org.apache.sqoop.tool.ImportTool.run(ImportTool.java:601)
at org.apache.sqoop.Sqoop.run(Sqoop.java:143)
at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:65)
at org.apache.sqoop.Sqoop.runSqoop(Sqoop.java:179)
at org.apache.sqoop.Sqoop.runTool(Sqoop.java:218)
at org.apache.sqoop.Sqoop.runTool(Sqoop.java:227)
at org.apache.sqoop.Sqoop.main(Sqoop.java:236)
15/03/15 22:30:33 ERROR tool.ImportTool: Encountered IOException running import job: java.io.IOException: No columns to generate for ClassWriter
at org.apache.sqoop.orm.ClassWriter.generate(ClassWriter.java:1584)
at org.apache.sqoop.tool.CodeGenTool.generateORM(CodeGenTool.java:96)
at org.apache.sqoop.tool.ImportTool.importTable(ImportTool.java:478)
at org.apache.sqoop.tool.ImportTool.run(ImportTool.java:601)
at org.apache.sqoop.Sqoop.run(Sqoop.java:143)
at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:65)
at org.apache.sqoop.Sqoop.runSqoop(Sqoop.java:179)
at org.apache.sqoop.Sqoop.runTool(Sqoop.java:218)
at org.apache.sqoop.Sqoop.runTool(Sqoop.java:227)
at org.apache.sqoop.Sqoop.main(Sqoop.java:236)
不过幸运的是找到这篇文章：http://my.oschina.net/u/1169607/blog/352225，将 mysql-connector-java-5.1.15.jar 更换为mysql-connector-java-5.1.32-bin.jar 即可消除上述错误。
至此还是没有成功，又出现如下错误了：
[hadoop@host25 bin]$ ./sqoop import --connect jdbc:mysql://192.168.0.1:3306/mydb?characterEncoding=UTF-8 --username test --password ‘test‘ --target-dir ‘/user/hive/warehouse/book‘ --table t_book ;
Warning: /home/hadoop/sqoop-1.4.5/../hbase does not exist! HBase imports will fail.
Please set $HBASE_HOME to the root of your HBase installation.
Warning: /home/hadoop/sqoop-1.4.5/../hcatalog does not exist! HCatalog jobs will fail.
Please set $HCAT_HOME to the root of your HCatalog installation.
Warning: /home/hadoop/sqoop-1.4.5/../accumulo does not exist! Accumulo imports will fail.
Please set $ACCUMULO_HOME to the root of your Accumulo installation.
Warning: /home/hadoop/sqoop-1.4.5/../zookeeper does not exist! Accumulo imports will fail.
Please set $ZOOKEEPER_HOME to the root of your Zookeeper installation.
15/03/15 23:10:55 INFO sqoop.Sqoop: Running Sqoop version: 1.4.5
15/03/15 23:10:55 WARN tool.BaseSqoopTool: Setting your password on the command-line is insecure. Consider using -P instead.
15/03/15 23:10:56 INFO manager.MySQLManager: Preparing to use a MySQL streaming resultset.
15/03/15 23:10:56 INFO tool.CodeGenTool: Beginning code generation
15/03/15 23:10:56 INFO manager.SqlManager: Executing SQL statement: SELECT t.* FROM `t_book` AS t LIMIT 1
15/03/15 23:10:56 INFO manager.SqlManager: Executing SQL statement: SELECT t.* FROM `t_book` AS t LIMIT 1
15/03/15 23:10:56 INFO orm.CompilationManager: HADOOP_MAPRED_HOME is /home/hadoop/hadoop-2.2.0/share/hadoop/mapreduce
Note: /tmp/sqoop-hadoop/compile/c798c2a151fc7c3baed090b15aa6e2cb/book.java uses or overrides a deprecated API.
Note: Recompile with -Xlint:deprecation for details.
15/03/15 23:10:59 INFO orm.CompilationManager: Writing jar file: /tmp/sqoop-hadoop/compile/c798c2a151fc7c3baed090b15aa6e2cb/book.jar
Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/hadoop/mapreduce/InputFormat
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:800)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:449)
at java.net.URLClassLoader.access$100(URLClassLoader.java:71)
at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:800)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:449)
at java.net.URLClassLoader.access$100(URLClassLoader.java:71)
at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:800)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:449)
at java.net.URLClassLoader.access$100(URLClassLoader.java:71)
at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:800)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:449)
at java.net.URLClassLoader.access$100(URLClassLoader.java:71)
at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
at org.apache.sqoop.manager.ImportJobContext.<init>(ImportJobContext.java:51)
at com.cloudera.sqoop.manager.ImportJobContext.<init>(ImportJobContext.java:33)
at org.apache.sqoop.tool.ImportTool.importTable(ImportTool.java:483)
at org.apache.sqoop.tool.ImportTool.run(ImportTool.java:601)
at org.apache.sqoop.Sqoop.run(Sqoop.java:143)
at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:70)
at org.apache.sqoop.Sqoop.runSqoop(Sqoop.java:179)
at org.apache.sqoop.Sqoop.runTool(Sqoop.java:218)
at org.apache.sqoop.Sqoop.runTool(Sqoop.java:227)
at org.apache.sqoop.Sqoop.main(Sqoop.java:236)
Caused by: java.lang.ClassNotFoundException: org.apache.hadoop.mapreduce.InputFormat
at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
... 58 more
至此百思不得其解，怎么会找不到mapred的类呢，琢磨之后马上意识到问题了，在我的Hadoop环境中配置了如下的环境变量：
export HADOOP_PREFIX="/home/hadoop/hadoop-2.2.0"
export HADOOP_MAPRED_HOME=${HADOOP_PREFIX}
这个与sqoop-env.sh中配置的环境变量冲突啊:
#add by zhanzk
export HADOOP_COMMON_HOME=/home/hadoop/hadoop-2.2.0
export HADOOP_MAPRED_HOME=/home/hadoop/hadoop-2.2.0/share/hadoop/mapreduce
export HIVE_HOME=/home/hadoop/hive-0.12.0
这才导致找不到mapreduce的包，所以现在有个简单办法，即是把mapreduce相关的jar包复制到$SQOOP_HOME/lib下面来，就什么事情也没有了。
cp /home/hadoop/hadoop-2.2.0/share/hadoop/mapreduce/*.jar /home/hadoop/sqoop-1.4.5/lib
至此问题才算真正解决了，再次导出mysql的数据到hdfs中的时候，终于在HDFS的/user/hive/warehouse/book这个目录下找到了输出的文件数据了。
虽说是导入数据到HDFS中成功了，但是系统中依然有如下错误：
15/03/16 13:07:12 INFO mapreduce.Job: Task Id : attempt_1426431271248_0007_m_000003_0, Status : FAILED
Error: java.lang.RuntimeException: java.lang.RuntimeException: java.sql.SQLException: Access denied for user ‘test‘@‘192.168.0.2‘ (using password: YES)
at org.apache.sqoop.mapreduce.db.DBInputFormat.setConf(DBInputFormat.java:167)
at org.apache.hadoop.util.ReflectionUtils.setConf(ReflectionUtils.java:73)
at org.apache.hadoop.util.ReflectionUtils.newInstance(ReflectionUtils.java:133)
at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:725)
at org.apache.hadoop.mapred.MapTask.run(MapTask.java:339)
at org.apache.hadoop.mapred.YarnChild$2.run(YarnChild.java:162)
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:1491)
at org.apache.hadoop.mapred.YarnChild.main(YarnChild.java:157)
Caused by: java.lang.RuntimeException: java.sql.SQLException: Access denied for user ‘test‘@‘192.168.0.1‘ (using password: YES)
at org.apache.sqoop.mapreduce.db.DBInputFormat.getConnection(DBInputFormat.java:220)
at org.apache.sqoop.mapreduce.db.DBInputFormat.setConf(DBInputFormat.java:165)
... 9 more
Caused by: java.sql.SQLException: Access denied for user ‘‘test‘@‘192.168.0.2‘ (using password: YES)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1094)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4208)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4140)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:925)
at com.mysql.jdbc.MysqlIO.proceedHandshakeWithPluggableAuthentication(MysqlIO.java:1747)
at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1287)
at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2494)
at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2527)
at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2309)
at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:834)
at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:46)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:526)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:408)
at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:419)
at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:344)
at java.sql.DriverManager.getConnection(DriverManager.java:571)
at java.sql.DriverManager.getConnection(DriverManager.java:215)
at org.apache.sqoop.mapreduce.db.DBConfiguration.getConnection(DBConfiguration.java:302)
at org.apache.sqoop.mapreduce.db.DBInputFormat.getConnection(DBInputFormat.java:213)
... 10 more
这个错误就简单了，我的数据库mydb并没有对192.168.0.1这个节点授权，完成授权后，问题自然就消失了。
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原文地址：http://www.cnblogs.com/LT-blogs/p/5049874.html
