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From Abraham Elmahrek <...@cloudera.com>
Subject Re: One question about "sqoop export"
Date Tue, 08 Apr 2014 13:57:57 GMT
Try removing the "--driver". Sqoop should automatically choose the correct
driver/manager based on your JDBC connection string.


On Tue, Apr 8, 2014 at 7:52 AM, Sandipan.Ghosh <Sandipan.Ghosh@target.com>wrote:

>  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 --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 --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 --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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