sqoop配置与使用

一直出现连接不上，这是什么 问题，求解答。谢谢。
[hadoop@master sqoop-1.2.0]$ bin/sqoop import --connect jdbc:mysql://localhost:3306/hadoopguide  --table widgets --hive-import
15/07/24 16:46:32 INFO tool.BaseSqoopTool: Using Hive-specific delimiters for output. You can override
15/07/24 16:46:32 INFO tool.BaseSqoopTool: delimiters with --fields-terminated-by, etc.
15/07/24 16:46:32 INFO tool.CodeGenTool: Beginning code generation
15/07/24 16:46:33 INFO manager.MySQLManager: Executing SQL statement: SELECT t.* FROM `widgets` AS t LIMIT 1
15/07/24 16:46:33 INFO manager.MySQLManager: Executing SQL statement: SELECT t.* FROM `widgets` AS t LIMIT 1
15/07/24 16:46:33 INFO orm.CompilationManager: HADOOP_HOME is /home/hadoop/hadoop-0.20.2/bin/..
15/07/24 16:46:33 INFO orm.CompilationManager: Found hadoop core jar at: /home/hadoop/hadoop-0.20.2/bin/../hadoop-0.20.2-core.jar
15/07/24 16:46:34 INFO orm.CompilationManager: Writing jar file: /tmp/sqoop-hadoop/compile/db5092fdecf222df21e8d9d231d47347/widgets.jar
15/07/24 16:46:34 WARN manager.MySQLManager: It looks like you are importing from mysql.
15/07/24 16:46:34 WARN manager.MySQLManager: This transfer can be faster! Use the --direct
15/07/24 16:46:34 WARN manager.MySQLManager: option to exercise a MySQL-specific fast path.
15/07/24 16:46:34 INFO manager.MySQLManager: Setting zero DATETIME behavior to convertToNull (mysql)
15/07/24 16:46:34 INFO mapreduce.ImportJobBase: Beginning import of widgets
15/07/24 16:46:35 INFO manager.MySQLManager: Executing SQL statement: SELECT t.* FROM `widgets` AS t LIMIT 1
15/07/24 16:46:36 INFO mapred.JobClient: Running job: job_201507241453_0009
15/07/24 16:46:37 INFO mapred.JobClient:  map 0% reduce 0%
15/07/24 16:46:51 INFO mapred.JobClient: Task Id : attempt_201507241453_0009_m_000000_0, Status : FAILED
java.lang.RuntimeException: java.lang.RuntimeException: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure

The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.
    at com.cloudera.sqoop.mapreduce.db.DBInputFormat.setConf(DBInputFormat.java:164)
    at org.apache.hadoop.util.ReflectionUtils.setConf(ReflectionUtils.java:62)
    at org.apache.hadoop.util.ReflectionUtils.newInstance(ReflectionUtils.java:117)
    at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:573)
    at org.apache.hadoop.mapred.MapTask.run(MapTask.java:305)
    at org.apache.hadoop.mapred.Child.main(Child.java:170)
Caused by: java.lang.RuntimeException: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure

The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.
    at com.cloudera.sqoop.mapreduce.db.DBInputFormat.getConnection(DBInputFormat.java:190)
    at com.cloudera.sqoop.mapreduce.db.DBInputFormat.setConf(DBInputFormat.java:159)
    ... 5 more
Caused by: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure

The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.
    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:422)
    at com.mysql.jdbc.Util.handleNewInstance(Util.java:406)
    at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1074)
    at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2214)
    at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:781)
    at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:46)
    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:422)
    at com.mysql.jdbc.Util.handleNewInstance(Util.java:406)
    at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:352)
    at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:284)
    at java.sql.DriverManager.getConnection(DriverManager.java:664)
    at java.sql.DriverManager.getConnection(DriverManager.java:270)
    at com.cloudera.sqoop.mapreduce.db.DBConfiguration.getConnection(DBConfiguration.java:149)
    at com.cloudera.sqoop.mapreduce.db.DBInputFormat.getConnection(DBInputFormat.java:184)
    ... 6 more
Caused by: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure

The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.
    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:422)
    at com.mysql.jdbc.Util.handleNewInstance(Util.java:406)
    at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1074)
    at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:343)
    at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2137)
    ... 19 more
Caused by: java.net.ConnectException: 拒绝连接
    at java.net.PlainSocketImpl.socketConnect(Native Method)
    at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:345)
    at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
    at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
    at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
    at java.net.Socket.connect(Socket.java:589)
    at java.net.Socket.connect(Socket.java:538)
    at java.net.Socket.<init>(Socket.java:434)
    at java.net.Socket.<init>(Socket.java:244)
    at com.mysql.jdbc.StandardSocketFactory.connect(StandardSocketFactory.java:253)
    at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:292)
    ... 20 more