043 hive数据同步到mysql

一：意义

1.意义

　　如果可以实现这个功能，就可以使用spark代替sqoop，功能程序就实现这个功能。

二：hive操作

1.准备数据

　　启动hive

　　

　　否则报错，因为在hive与spark集成的时候，配置过配置项。

　　

　　后来，又看见这个文档，感觉很好的解释了我存在的问题：https://blog.csdn.net/freedomboy319/article/details/44828337

2.新建部门员工表

　　

-》创建员工表
create table emp(
empno int,
ename string,
job string,
mgr int,
hiredate string,
sal double,
comm double,
deptno int
)
row format delimited fields terminated by '	';
load data local inpath '/opt/datas/emp.txt' into table emp;


-》部门表
create table dept(
deptno int,
dname string,
loc string
)
row format delimited fields terminated by '	';
load data local inpath '/opt/datas/dept.txt' into table dept;

3.效果

　　

三：程序

1.大纲

　　

2.前提

　　需要hive-site.xml

3.需要的依赖

        <!-- https://mvnrepository.com/artifact/org.apache.spark/spark-hive -->
        <dependency>
            <groupId>org.apache.spark</groupId>
            <artifactId>spark-hive_2.10</artifactId>
            <version>${spark.version}</version>
            <scope>provided</scope>
        </dependency>

        <!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>6.0.4</version>
        </dependency>

4.报错如下

Exception in thread "main" java.sql.SQLNonTransientConnectionException: CLIENT_PLUGIN_AUTH is required
    at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:550)
    at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:537)
    at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:527)
    at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:512)
    at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:480)
    at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:498)
    at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:494)
    at com.mysql.cj.jdbc.exceptions.SQLExceptionsMapping.translateException(SQLExceptionsMapping.java:72)
    at com.mysql.cj.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:1634)
    at com.mysql.cj.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:637)
    at com.mysql.cj.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:351)
    at com.mysql.cj.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:224)
    at org.apache.spark.sql.execution.datasources.jdbc.JdbcUtils$$anonfun$createConnectionFactory$2.apply(JdbcUtils.scala:61)
    at org.apache.spark.sql.execution.datasources.jdbc.JdbcUtils$$anonfun$createConnectionFactory$2.apply(JdbcUtils.scala:52)
    at org.apache.spark.sql.DataFrameWriter.jdbc(DataFrameWriter.scala:278)
    at com.scala.it.HiveToMysql$.main(HiveToMysql.scala:28)
    at com.scala.it.HiveToMysql.main(HiveToMysql.scala)
Caused by: com.mysql.cj.core.exceptions.UnableToConnectException: CLIENT_PLUGIN_AUTH is required
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
    at com.mysql.cj.core.exceptions.ExceptionFactory.createException(ExceptionFactory.java:54)
    at com.mysql.cj.core.exceptions.ExceptionFactory.createException(ExceptionFactory.java:73)
    at com.mysql.cj.mysqla.io.MysqlaProtocol.rejectConnection(MysqlaProtocol.java:319)
    at com.mysql.cj.mysqla.authentication.MysqlaAuthenticationProvider.connect(MysqlaAuthenticationProvider.java:207)
    at com.mysql.cj.mysqla.io.MysqlaProtocol.connect(MysqlaProtocol.java:1361)
    at com.mysql.cj.mysqla.MysqlaSession.connect(MysqlaSession.java:132)
    at com.mysql.cj.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:1754)
    at com.mysql.cj.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:1624)
    ... 8 more

原因：

　　mysql-connect版本不匹配，换5.1.17版本。

　

5.程序

package com.scala.it

import java.util.Properties

import org.apache.spark.sql.SaveMode
import org.apache.spark.sql.hive.HiveContext
import org.apache.spark.{SparkConf, SparkContext}

object HiveToMysql {
  def main(args: Array[String]): Unit = {
    val conf = new SparkConf()
      .setMaster("local[*]")
      .setAppName("hive-yo-mysql")
    val sc = SparkContext.getOrCreate(conf)
    val sqlContext = new HiveContext(sc)
    val (url, username, password) = ("jdbc:mysql://linux-hadoop01.ibeifeng.com:3306/hadoop09", "root", "123456")
    val props = new Properties()
    props.put("user", username)
    props.put("password", password)

    // ==================================
    // 第一步：同步hive的dept表到mysql中
    sqlContext
      .read
      .table("hadoop09.dept") // database.tablename
      .write
      .mode(SaveMode.Overwrite) // 存在覆盖
      .jdbc(url, "mysql_dept", props)
  }
}

6.效果