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From Sandipan.Ghosh <Sandipan.Gh...@target.com>
Subject RE: One question about "sqoop export"
Date Tue, 08 Apr 2014 13:52:58 GMT
Do you have write permission to MySql?

From: Lei Lei [mailto:learnerfinix@gmail.com]
Sent: Tuesday, April 08, 2014 7:05 PM
To: user@sqoop.apache.org
Subject: One question about "sqoop export"

Hi all,
    I have one question about "sqoop export". Thanks!
    My Hadoop version is 1.2.1, and it works well; my sqoop version is 1.4.4.
    I also installed MySQL whose version is 5.1.73. In MySQL, I created one table as below:

create table dimension_result (
            result int not null primary key,
            description VARCHAR(32) not null
);

    On HDFS, I have a file called dimension_result.txt under /tmp/dr
    See below.
hadoop fs -cat /tmp/dr/dimension_result.txt
1,BlackWin
2,WhiteWin
0,Draw
-1,Unknown

    I want to export the content of dimension_result.txt to the MySQL table, but it always
failed.
My command is:
sqoop-export --connect jdbc:mysql://127.0.0.1:3306/test<http://127.0.0.1:3306/test>
--driver com.mysql.jdbc.Driver --username hadoop --table dimension_result --export-dir /tmp/dr

I also tried:
sqoop-export --connect jdbc:mysql://127.0.0.1:3306/test<http://127.0.0.1:3306/test>
--driver com.mysql.jdbc.Driver --username hadoop --table dimension_result --export-dir /tmp/dr/dimension_result.txt

     (My MySQL instance does not need password, and the following command can succeed.
sqoop-list-databases --connect jdbc:mysql://127.0.0.1:3306<http://127.0.0.1:3306> --username
hadoop )

      The error info is as below. Does anyone know why? Thanks!

14/04/08 21:33:03 INFO mapred.JobClient: Task Id : attempt_201403071512_0021_m_000000_1, Status
: FAILED
java.io.IOException: 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 org.apache.sqoop.mapreduce.ExportOutputFormat.getRecordWriter(ExportOutputFormat.java:79)
        at org.apache.hadoop.mapred.MapTask$NewDirectOutputCollector.<init>(MapTask.java:627)
        at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:753)
        at org.apache.hadoop.mapred.MapTask.run(MapTask.java:364)
        at org.apache.hadoop.mapred.Child$4.run(Child.java:255)
        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:1190)
        at org.apache.hadoop.mapred.Child.main(Child.java:249)
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: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:411)
        at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1129)
        at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:358)
        at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2498)
        at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2535)
        at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2320)
        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:411)
        at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:416)
        at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:347)
        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:294)
        at org.apache.sqoop.mapreduce.AsyncSqlRecordWriter.<init>(AsyncSqlRecordWriter.java:76)
        at org.apache.sqoop.mapreduce.ExportOutputFormat$ExportRecordWriter.<init>(ExportOutputFormat.java:95)
        at org.apache.sqoop.mapreduce.ExportOutputFormat.getRecordWriter(ExportOutputFormat.java:77)
        ... 8 more
Caused by: java.net.ConnectException: Connection refused
        at java.net.PlainSocketImpl.socketConnect(Native Method)
        at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:339)
        at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:200)
        at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:182)
        at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
        at java.net.Socket.connect(Socket.java:579)
        at java.net.Socket.connect(Socket.java:528)
        at java.net.Socket.<init>(Socket.java:425)
        at java.net.Socket.<init>(Socket.java:241)
        at com.mysql.jdbc.StandardSocketFactory.connect(StandardSocketFactory.java:256)
        at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:308)
        ... 26 more


Regards,
Finix


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