sqoop安装及使用

安装

下载地址：
http://archive.cloudera.com/cdh5/cdh/5/sqoop-1.4.6-cdh5.5.2.tar.gz
下载 sqoop-1.4.6-cdh5.5.2.tar.gz

解压后命名为sqoop-1.4.6

修改环境变量：
export SQOOP_HOME=/home/xuyao/下载/sqoop-1.4.6
export PATH= $PATH:$SQOOP_HOME/bin
export HIVE_CONF_DIR=/home/xuyao/下载/hive-2.0.1/conf
export HADOOP_CLASSPATH=$HADOOP_CLASSPATH:$HIVE_HOME/lib/*

修改sqoop-env.sh：
export HADOOP_COMMON_HOME=/home/xuyao/下载/hadoop-2.6.5
export HADOOP_MAPRED_HOME=/home/xuyao/下载/hadoop-2.6.5
export HIVE_HOME=/home/xuyao/下载/hive-2.0.1

修改bin/configure-sqoop：注释掉HCAT_HOME、ACCUMULO_HOME、ZOOKEEPER_HOME的检查。

## Moved to be a runtime check in sqoop.
#if [ ! -d "${HCAT_HOME}" ]; then
#  echo "Warning: $HCAT_HOME does not exist! HCatalog jobs will fail."
#  echo 'Please set $HCAT_HOME to the root of your HCatalog installation.'
#fi

#if [ ! -d "${ACCUMULO_HOME}" ]; then
#  echo "Warning: $ACCUMULO_HOME does not exist! Accumulo imports will fail."
#  echo 'Please set $ACCUMULO_HOME to the root of your Accumulo installation.'
#fi
#if [ ! -d "${ZOOKEEPER_HOME}" ]; then
#  echo "Warning: $ZOOKEEPER_HOME does not exist! Accumulo imports will fail."
#  echo 'Please set $ZOOKEEPER_HOME to the root of your Zookeeper installation.'
#fi

命令行输入sqoop help后：

将mysql-connector-java-5.1.40-bin.jar复制到sqoop的lib下面。

安装mysql：
sudo apt-get update
sudo apt-get install mysql-server mysql-client
在弹出的对话框中设置root的密码，就123好了。

sudo netstat -tap | grep mysql
检查是否有端口在监听

mysql -u root -p

输入密码123

create database mydatabase;
use mydatabase;
create table student  
(  
    id int not null,  
    name varchar(50) not null,  
    age int not null,  
    primary key (id)  
);
insert into student values(1,'zhangsan',20);
insert into student values(2,'lisi',21);
insert into student values(3,'wangwu',22);
select * from student;

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启动Hadoop，yarn

start-dfs.sh
start-yarn.sh

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导入

将mysql导入HDFS中：

sqoop import --connect jdbc:mysql://localhost/mydatabase --username root --password 123 --table student -m 1  

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-m 表示启动N个map来并行导入数据，默认是4个，最好不要将数字设置为高于集群的节点数
默认放在/user/用户名/
查看：

hadoop fs -cat /user/xuyao/student/part-m-00000

在hive中建立表，注意用逗号：

Create Table student  (id Int, name String, age Int) Row format delimited fields terminated By ',';

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将HDFS中的这个表导入HIVE中：

load data inpath '/user/xuyao/student' into table student;

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查看：

select * from student;

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还有种非常方便的把上面的过程结合起来的，但是会出现BUG，目前还没解决：

sqoop import --connect jdbc:mysql://localhost/mydatabase --username root --password 123 --table student -m 1  --hive-import

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导出

在mysql中建立：

Create Table dept (deptno Int,dname varchar(50));

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导出：

sqoop export --connect jdbc:mysql://localhost/mydatabase --username root --password 123 --table dept --export-dir /xy/hive/warehouse/dept --input-fields-terminated-by '\t'

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查看mysql：

select * from dept;

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