当我试图将数据从mysql拉到hadoop时我正在写这个命令
sudo import --connect jdbc:mysql://localhost/naresh --table marks --username root --password root
我收到此错误
13/09/04 17:00:43 WARN tool.BaseSqoopTool: Setting your password on the command-line is insecure. Consider using -P instead.
13/09/04 17:00:43 INFO manager.MySQLManager: Preparing to use a MySQL streaming resultset.
13/09/04 17:00:43 INFO tool.CodeGenTool: Beginning code generation
13/09/04 17:00:43 INFO manager.SqlManager: Executing SQL statement: SELECT t.* FROM `marks` AS t LIMIT 1
13/09/04 17:00:43 INFO manager.SqlManager: Executing SQL statement: SELECT t.* FROM `marks` AS t LIMIT 1
13/09/04 17:00:43 INFO orm.CompilationManager: HADOOP_HOME is /usr/lib/hadoop
13/09/04 17:00:43 INFO orm.CompilationManager: Found hadoop core jar at: /usr/lib/hadoop/hadoop-core.jar
13/09/04 17:00:44 INFO orm.CompilationManager: Writing jar file: /tmp/sqoop-nareshkumar/compile/b66caff07ef718bd6ff55ff7744d20a6/marks.jar
13/09/04 17:00:44 WARN manager.MySQLManager: It looks like you are importing from mysql.
13/09/04 17:00:44 WARN manager.MySQLManager: This transfer can be faster! Use the --direct
13/09/04 17:00:44 WARN manager.MySQLManager: option to exercise a MySQL-specific fast path.
13/09/04 17:00:44 INFO manager.MySQLManager: Setting zero DATETIME behavior to convertToNull (mysql)
13/09/04 17:00:44 INFO mapreduce.ImportJobBase: Beginning import of marks
13/09/04 17:00:48 INFO ipc.Client: Retrying connect to server: localhost/127.0.0.1:9001. Already tried 0 time(s).
13/09/04 17:00:49 INFO ipc.Client: Retrying connect to server: localhost/127.0.0.1:9001. Already tried 1 time(s).
13/09/04 17:00:50 INFO ipc.Client: Retrying connect to server: localhost/127.0.0.1:9001. Already tried 2 time(s).
13/09/04 17:00:51 INFO ipc.Client: Retrying connect to server: localhost/127.0.0.1:9001. Already tried 3 time(s).
13/09/04 17:00:52 INFO ipc.Client: Retrying connect to server: localhost/127.0.0.1:9001. Already tried 4 time(s).
13/09/04 17:00:53 INFO ipc.Client: Retrying connect to server: localhost/127.0.0.1:9001. Already tried 5 time(s).
13/09/04 17:00:54 INFO ipc.Client: Retrying connect to server: localhost/127.0.0.1:9001. Already tried 6 time(s).
13/09/04 17:00:55 INFO ipc.Client: Retrying connect to server: localhost/127.0.0.1:9001. Already tried 7 time(s).
13/09/04 17:00:56 INFO ipc.Client: Retrying connect to server: localhost/127.0.0.1:9001. Already tried 8 time(s).
13/09/04 17:00:57 INFO ipc.Client: Retrying connect to server: localhost/127.0.0.1:9001. Already tried 9 time(s).
13/09/04 17:00:57 ERROR security.UserGroupInformation: PriviledgedActionException as:nareshkumar (auth:SIMPLE) cause:java.net.ConnectException: Call to localhost/127.0.0.1:9001 failed on connection exception: java.net.ConnectException: Connection refused
13/09/04 17:00:57 ERROR tool.ImportTool: Encountered IOException running import job: java.net.ConnectException: Call to localhost/127.0.0.1:9001 failed on connection exception: java.net.ConnectException: Connection refused
at org.apache.hadoop.ipc.Client.wrapException(Client.java:1179)
at org.apache.hadoop.ipc.Client.call(Client.java:1155)
at org.apache.hadoop.ipc.RPC$Invoker.invoke(RPC.java:226)
at org.apache.hadoop.mapred.$Proxy0.getProtocolVersion(Unknown Source)
at org.apache.hadoop.ipc.RPC.getProxy(RPC.java:398)
at org.apache.hadoop.ipc.RPC.getProxy(RPC.java:384)
at org.apache.hadoop.mapred.JobClient.createRPCProxy(JobClient.java:511)
at org.apache.hadoop.mapred.JobClient.init(JobClient.java:496)
at org.apache.hadoop.mapred.JobClient.<init>(JobClient.java:479)
at org.apache.hadoop.mapreduce.Job$1.run(Job.java:539)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:415)
at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1278)
at org.apache.hadoop.mapreduce.Job.connect(Job.java:537)
at org.apache.hadoop.mapreduce.Job.submit(Job.java:525)
at org.apache.hadoop.mapreduce.Job.waitForCompletion(Job.java:556)
at com.cloudera.sqoop.mapreduce.ImportJobBase.runJob(ImportJobBase.java:143)
at com.cloudera.sqoop.mapreduce.ImportJobBase.runImport(ImportJobBase.java:203)
at com.cloudera.sqoop.manager.SqlManager.importTable(SqlManager.java:464)
at com.cloudera.sqoop.manager.MySQLManager.importTable(MySQLManager.java:101)
at com.cloudera.sqoop.tool.ImportTool.importTable(ImportTool.java:382)
at com.cloudera.sqoop.tool.ImportTool.run(ImportTool.java:455)
at com.cloudera.sqoop.Sqoop.run(Sqoop.java:146)
at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:65)
at com.cloudera.sqoop.Sqoop.runSqoop(Sqoop.java:182)
at com.cloudera.sqoop.Sqoop.runTool(Sqoop.java:221)
at com.cloudera.sqoop.Sqoop.runTool(Sqoop.java:230)
at com.cloudera.sqoop.Sqoop.main(Sqoop.java:239)
Caused by: java.net.ConnectException: Connection refused
at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:708)
at org.apache.hadoop.net.SocketIOWithTimeout.connect(SocketIOWithTimeout.java:206)
at org.apache.hadoop.net.NetUtils.connect(NetUtils.java:519)
at org.apache.hadoop.net.NetUtils.connect(NetUtils.java:484)
at org.apache.hadoop.ipc.Client$Connection.setupConnection(Client.java:468)
at org.apache.hadoop.ipc.Client$Connection.setupIOstreams(Client.java:575)
at org.apache.hadoop.ipc.Client$Connection.access$2300(Client.java:212)
at org.apache.hadoop.ipc.Client.getConnection(Client.java:1292)
at org.apache.hadoop.ipc.Client.call(Client.java:1121)
... 26 more
我尝试在core-site.xml和mapred-site.xml中搜索并进行更改
请帮帮我 提前致谢
答案 0 :(得分：0)
我认为这是港口号的问题。希望下面的命令将有所帮助
sudo import --connect jdbc:mysql://localhost:3306/naresh --table marks --username root --password root
答案 1 :(得分：0)
当我学习SQOOP时，我也经历过类似的问题。就我而言，我解决了以下问题。
使用以下命令检查Hadoop的Namenode是否处于安全模式：
$bin/hadoop dfsadmin -safemode get
希望输出结果如下：
Safe mode is ON
在hdfs集群启动期间，直到namenode从fsimage接收文件系统状态，编辑日志和datanode块报告，它仍处于安全模式（只读）。之后，namenode自动离开安全模式。如果没有发生，我们会遇到上面遇到的问题。
使用以下命令手动关闭安全模式：
$ bin/hadoop dfsadmin -safemode leave
现在使用上面的get命令再次检查模式。您会发现它已关闭。
Safe mode is OFF
关闭安全模式后，您可以使用相应的命令将数据从数据库导入/递增导入hdfs。