搭建Hadoop2.7.3+Hive2.1.1及MySQL(配置Hive+MySQL+Connector）(三)

准备工作下载最新连接器地址

https://dev.mysql.com/downloads/connector/j/

例子：下载mysql-connector-java-5.1.41.tar

1、解压连接器connector文件

1.1、解压

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[root@localhost Software]# tar xzfmysql-connector-java-5.1.41.tar.gz

[root@localhost Software]# cd mysql-connector-java-5.1.41/


1.2、查看文件夹

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[root@localhostmysql-connector-java-5.1.41]# ll


1.3、Copy到hive/lib路径下

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[root@localhost Software]# cpmysql-connector-java-5.1.41/mysql-connector-java-5.1.41-bin.jar/usr/hive/lib/mysql-connector-java-5.1.41-bin.jar

2、登陆MySQL创建数据库:hive_db（注意配置hive-site.xml时有指定）

2.1、用户名:root 密码:password，另开一个终端登陆MySQL,创建数据库hive_db

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[root@localhost hive]# mysql -u root -ppassword

mysql> create database hive_db;

3、改配置文件hive-site.xml

以下只列出改动的配置项，其它保留默认

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<configuration>

<property>

<name>hive.metastore.warehouse.dir</name>

<value>/usr/hive/warehouse</value>

<description>location of default database for the warehouse</description>

</property>

<property>

<name>hive.metastore.local</name>

<value>true</value>

<description>Use false if a production metastore server is used</description>

</property>

<property>

<name>hive.exec.scratchdir</name>

<value>/tmp/hive</value>

<description>HDFS root scratch dir for Hive jobs which gets created with write all (733) permission. For each connecting user, an HDFS scratch dir: ${hive.exec.scratchdir}/<username> is created, with ${hive.scratch.dir.permission}.</description>

</property>

<property>

<name>javax.jdo.option.ConnectionURL</name>

<value>jdbc:mysql://localhost:3306/hive_db?createDatabaseIfNoExist=true</value>

<description> Roy

JDBC connect string for a JDBC metastore.

To use SSL to encrypt/authenticate the connection, provide database-specific SSL flag in the connection URL.

For example, jdbc:postgresql://myhost/db?ssl=true for postgres database.

</description>

</property>

<property>

<name>javax.jdo.option.ConnectionDriverName</name>

<value>com.mysql.jdbc.Driver</value>

<description>User-Defined(Roy) Driver class name for a JDBC metastore</description>

</property>

<property>

<name>javax.jdo.option.ConnectionUserName</name>

<value>root</value>

<description>User-defined(Roy)Username to use against metastore database</description>

</property>

<property>

<name>javax.jdo.option.ConnectionPassword</name>

<value>password</value>

<description>User-defined(Roy)password to use against metastore database</description>

</property>

</configuration>

4、使用schematool初始化

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[root@localhost hive]# schematool -dbType mysql -initSchema

--显示成功

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schemaTool completed

5、启动hive服务端程序

5.1、启动hive服务端

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[root@localhost hive]# hive --servicemetastore &

--屏幕提示信息不显示时，按ctrl+c退出

5.2、查看进程信息

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[root@localhost hive]# jps

--显示进程信息多了（RunJar）

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51280 Jps

5985 SecondaryNameNode

6226 ResourceManager

45766 DataNode

5753 NameNode

51194 RunJar

6348 NodeManager

5.3、有需要时，可启动hive 远程服务 (端口号10000)

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[root@localhost hive]# hive --servicehiveserver &

6、测试环境配置是否成功

6.1、准备导入文本文件/root/桌面/Test/wc-in/a.txt

格式：

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1,h

2,i

3,v

4,e

6.2、登陆hive成功后，测试创建表

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root@localhost hadoop]# hive


6.2.1、创建表及指定逗号（，）为分隔符

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hive> create table a(id int,name string)

> row format delimited fields terminated by ',';

--显示信息

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OK

Time taken: 0.288 seconds


6.2.2、导入文件a.txt

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hive> load data local inpath '/root/桌面/Test/wc-in/a.txt' into table a;

--显示信息

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Loading data to table default.a

OK

Time taken: 0.763 seconds


6.2.3、查看效果

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hive> select * from a;

--显示信息

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OK

1 h

2 i

3 v

4 e

Time taken: 0.309 seconds, Fetched: 4row(s)


6.3、在Hive内使用dfs命令

6.3.1、查看a表dfs存储路径

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hive> dfs -ls /usr/hive/warehouse/a;

--显示信息

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Found 1 items

-rw-r--r-- 1 root supergroup 16 2017-03-08 17:46/usr/hive/warehouse/a/a.txt


6.3.2、查看文件内容

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hive> dfs -cat /usr/hive/warehouse/a/*;

--显示信息

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1,h

2,i

3,v

4,e

7、登陆MySQL查看创建表

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[root@localhost conf]# mysql -u root -ppassword

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mysql> use hive_db;

mysql> select TBL_ID, CREATE_TIME,DB_ID, OWNER, TBL_NAME,TBL_TYPE from TBLS;

--显示信息

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+--------+-------------+-------+-------+----------+---------------+

| TBL_ID | CREATE_TIME | DB_ID | OWNER |TBL_NAME | TBL_TYPE |

+--------+-------------+-------+-------+----------+---------------+

| 37 | 1488966386 | 1 | root | a | MANAGED_TABLE |

+--------+-------------+-------+-------+----------+---------------+

1 row in set (0.03 sec)

8、在hdfs查看生成文件（同上步骤[6.3]）

8.1、查看a表存储路径

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[root@localhost hadoop]# hdfs dfs -ls/usr/hive/warehouse/a

--显示信息

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Found 1 items

-rw-r--r-- 1 root supergroup 162017-03-08 17:46 /usr/hive/warehouse/a/a.txt


8.2、查看内容

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[root@localhost hadoop]# hdfs dfs -cat /usr/hive/warehouse/a/*

--显示信息

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1,h

2,i

3,v

4,e

常见问题处理：

1、启动hive时报错

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[root@localhost hive]# hive

--显示报错信息

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Caused by:org.apache.hadoop.ipc.RemoteException(org.apache.hadoop.hdfs.server.namenode.SafeModeException):Cannot create directory /tmp/hive/root/24f1d91f-f32b-47e1-824d-ba26b02bd13e.Name node is in safe mode.

原因：hadoop为安全模式

--解决方法：

关闭安全模式

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[root@localhost hadoop]# hadoop dfsadmin-safemode leave

--显示信息

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DEPRECATED: Use of this script to executehdfs command is deprecated.

Instead use the hdfs command for it.

Safe mode is OFF

2、在导入数据时出错信息

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hive> load data local inpath '/root/桌面/Test/wc-in/a.txt' into table a;

--显示报错信息

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FAILED: Execution Error, return code 1 fromorg.apache.hadoop.hive.ql.exec.MoveTask.org.apache.hadoop.ipc.RemoteException(java.io.IOException): File/usr/hive/warehouse/a/a_copy_2.txt could only be replicated to 0 nodes insteadof minReplication (=1). There are 0datanode(s) running and no node(s) are excluded in this operation.

原因：hadoop没有启动datanote

解决方法：

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[root@localhost hive]# start-dfs.sh

[root@localhost hive]# jps

--显示信息

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51152 Jps

5985 SecondaryNameNode

6226 ResourceManager

45766 DataNode

5753 NameNode

6348 NodeManager

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应网友要求测个例子：

--调用HiveServer2客户端和beeline命令用法

--启用服务，信息不动时Ctrl+C退出

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[root@localhost bin]# hiveserver2

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[root@localhost bin]# beeline

显示信息如下：

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which: no hbase in (/usr/lib64/qt-3.3/bin:/root/perl5/bin:/usr/local/bin:/usr/local/sbin:/usr/bin:/usr/sbin:/bin:/sbin:/usr/hadoop/bin:/usr/hadoop/bin:/usr/hadoop/sbin:/usr/hive/bin:/usr/java/jdk1.8.0_111/bin:/root/bin:/usr/hadoop/bin:/usr/hadoop/sbin:/usr/hive/bin:/usr/java/jdk1.8.0_111/bin)

Beeline version 2.1.1 by Apache Hive

beeline>

连接和登陆账号密码输入：

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Connecting to jdbc:mysql://localhost:3306/hive_db

Enter username for jdbc:mysql://localhost:3306/hive_db: root

Enter password for jdbc:mysql://localhost:3306/hive_db: ********

--测试创建表:

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0: jdbc:mysql://localhost:3306/hive_db> create table Test_beeline(id int);

显示信息:

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No rows affected (0.044 seconds)

--查看创建表

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0: jdbc:mysql://localhost:3306/hive_db> show tables;