不朽情缘怎么爆4血

書名： Apache Hive Essentials
作者名： Dayong Du
本章字?jǐn)?shù)： 444字
更新時(shí)間： 2021-07-23 20:25:29

Installing Hive from Apache

To introduce the Hive installation, we use Hive version 1.0.0 as an example. The pre-installation requirements for this installation are as follows:

JDK 1.7.0_51
Hadoop 0.20.x, 0.23.x.y, 1.x.y, or 2.x.y
Ubuntu 14.04/CentOS 6.2

Note

Since we focus on Hive in this book, the installation steps for Java and Hadoop are not provided here. For steps on installing them, please refer to https://www.java.com/en/download/help/download_options.xml and http://hadoop.apache.org/docs/current/hadoop-project-dist/hadoop-common/ClusterSetup.html.

The following steps describe how to install Hive from Apache through the Linux command line:

Download Hive from Apache Hive and unpack it:

bash-4.1$ wget http://apache.mirror.rafal.ca/hive/hive-1.0.0/apache-hive-1.0.0-bin.tar.gz
bash-4.1$ tar -zxvf apache-hive-1.0.0-bin.tar.gz

Add Hive to the system path by opening /etc/profile or ~/.bashrc and add the following two rows:

export HIVE_HOME=/home/hivebooks/apache-hive-1.0.0-bin
export PATH=$PATH:$HIVE_HOME/bin:$HIVE_HOME/conf

Enable the settings immediately:
```
bash-4.1$ source /etc/profile
```

Create the configuration files:

bash-4.1$ cd apache-hive-1.0.0-bin/conf
bash-4.1$ cp hive-default.xml.template hive-site.xml
bash-4.1$ cp hive-env.sh.template hive-env.sh
bash-4.1$ cp hive-exec-log4j.properties.template hive-exec-log4j.properties
bash-4.1$ cp hive-log4j.properties.template hive-log4j.properties

Modify the configuration file at $HIVE_HOME/conf/hive-env.sh:

#Set HADOOP_HOME to point to a specific Hadoop install directory
export HADOOP_HOME=/home/hivebooks/hadoop-2.2.0
#Hive Configuration Directory can be accessed at:
export HIVE_CONF_DIR=/home/hivebooks/apache-hive-1.0.0-bin/conf

Modify the configuration file at $HIVE_HOME/conf/hive-site.xml. There are some important parameters that need special attention:
- hive.metastore.warehourse.dir: This is the path for Hive warehouse storage. By default it is /user/hive/warehouse.
- hive.exec.scratchdir: This is the temporary data file path. By default it is /tmp/hive-${user.name}.

By default, Hive uses the Derby (http://db.apache.org/derby/) database as the metadata store. Hive can also use other databases, such as PostgreSQL (http://www.postgresql.org/) or MySQL (http://www.mysql.com/) as the metadata store. To configure Hive to use other databases, the following parameters should be configured:

javax.jdo.option.ConnectionURL            // the database URL
javax.jdo.option.ConnectionDriverName     // the JDBC driver name
javax.jdo.option.ConnectionUserName       // database username
javax.jdo.option.ConnectionPassword       // database password

The following is an example setting using MySQL as the metastore database:

<property>
  <name>javax.jdo.option.ConnectionURL</name>
  <value>jdbc:mysql://myhost:3306/hive?createDatabase IfNotExist=true</value>
  <description>JDBC connect string for a JDBC metastore</description>
</property>
<property>
  <name>javax.jdo.option.ConnectionDriverName</name>
  <value>com.mysql.jdbc.Driver</value>
  <description>Driver class name for a JDBC metastore</description>
</property>
<property>
  <name>javax.jdo.option.ConnectionUserName</name>
  <value>hive</value>
  <description>username to use against metastore database</description>
</property>
<property>
  <name>javax.jdo.option.ConnectionPassword</name>
  <value>hive</value>
  <description>password to use against metastore database</description>
</property>

Make sure the MySQL JDBC driver is available at $HIVE_HOME/lib.

Note

The differences between an embed Derby database and an external database is that an external database offers a shared service so that users can share the metadata of Hive. However, an embed database is only visible to the local users.

Create folders and grant proper write permissions to the user group in the HDFS folder:

bash-4.1$ hdfs dfs –mkdir /tmp
bash-4.1$ hdfs dfs –mkdir /user/hive/warehouse
bash-4.1$ hdfs dfs -chmod g+w /tmp
bash-4.1$ hdfs dfs -chmod g+w /user/hive/warehouse

That's all about Apache Hive installation. In one of the Hive nodes installed, type hive to enter the Hive command-line environment (hive>), which verifies Hive is successfully installed.

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Apache Hive Essentials

Installing Hive from Apache

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