Sqoop: Could not load mysql driver exception

问题:

I Installed Sqoop in my local machine. Following are the config information.

Bash.bashrc:

export HADOOP_HOME=/home/hduser/hadoop
export HBASE_HOME=/home/hduser/hbase
export HIVE_HOME=/home/hduser/hive
export HCAT_HOME=/home/hduser/hive/hcatalog
export SQOOP_HOME=/home/hduser/sqoop

export PATH=$PATH:$HIVE_HOME/bin
export PATH=$PATH:$HADOOP_HOME/bin
export PATH=$PATH:$HBASE_HOME/bin
export PATH=$PATH:$SQOOP_HOME/bin
export PATH=$PATH:$HCAT_HOME/bin

Hadoop:

Version: Hadoop 1.0.3

Hive:

Version: hive 0.11.0 

Mysql Connector driver

version: mysql-connector-java-5.1.29

"The driver is copied to the lib folder of sqoop"

Sqoop :

version: sqoop 1.4.4

After making all the installation I create a table in mysql named practice_1, But when I run the load command to load data from mysql to hdfs the command throws an exception:

ERROR sqoop.Sqoop: Got exception running Sqoop: java.lang.RuntimeException: Could not     load db driver class: com.mysql.jdbc.Driver

Coud anyone please guide me what can be the possible problem.

回答1:

You need database driver in 'SQOOP' classpath check this It has wonderful explanation about the 'SQOOP'

SQOOP has other options like

Ex: --driver com.microsoft.jdbc.sqlserver.SQLServerDriver -libjars=".*jar"

from here

You can use Sqoop with any other JDBC-compliant database. First, download the appropriate JDBC driver for the type of database you want to import, and install the .jar file in the $SQOOP_HOME/lib directory on your client machine. (This will be /usr/lib/sqoop/lib if you installed from an RPM or Debian package.) Each driver .jar file also has a specific driver class which defines the entry-point to the driver. For example, MySQL's Connector/J library has a driver class of com.mysql.jdbc.Driver. Refer to your database vendor-specific documentation to determine the main driver class. This class must be provided as an argument to Sqoop with --driver.

You may be interested in understanding the difference between connector and driver here is the article

回答2:

Another solution which avoids using a shared library is adding the driver jar to the classpath of sqoop by using HADOOP_CLASSPATH. I haven't got the -libjars option to work. This solution works also on a secure cluster using kerberos.

HADOOP_CLASSPATH=/use.case/lib/postgresql-9.2-1003-jdbc4.jar
sqoop export --connect jdbc:postgresql://db:5432/user \
  --driver org.postgresql.Driver \
  --connection-manager org.apache.sqoop.manager.GenericJdbcManager \
  --username user \
  -P \
  --export-dir /user/hive/warehouse/db1/table1 \
  --table table2

This one works at least with sqoop 1.4.3-cdh4.4.0

回答3:

You need to add the MySql connector to /usr/lib/sqoop/lib. MySQL JDBC Driver by default is not present in Sqoop distribution in order to ensure that the default distribution is fully Apache license compliant. Hope this helps...!!!

回答4:

If you have copied mysql driver to the sqoop lib folder. It will work for sure. Make sure you sqoop command is correct

/home/hduser/sqoop/bin/sqoop import --connect jdbc:mysql://localhost:3306/test --username root --password root -–table practice_1 -m 1

回答5:

copy the 'mysql-connector-java-5.1.41-bin.jar' into sqoop/lib folder and execute sqoop import statements

回答6:

You need to grant priveleges to the tables as below:

grant all privileges on marksheet.* to 'root'@'192.168.168.1' identified by 'root123';

flush privileges;

Here is sample command that I have successfully executed:

sqoop import --verbose --fields-terminated-by ',' --connect jdbc:mysql://192.168.168.1/test --username root --password root123 --table student --hive-import --create-hive-table --hive-home /home/training/hive --warehouse-dir /user/hive/warehouse --fields-terminated-by ',' --hive-table studentmysql