Hive的安裝其實很簡單下載tar包解壓，然後配置一下HIVE_HOME和系統PATH就可以了
然後運行hive
Logging initialized using configuration in jar:file:/home/kira/src/hive/current/lib/hive-common-0.8.1.jar!/hive-log4j.properties
Hive history file=/tmp/kira/hive_job_log_kira_201209101140_767693934.txt
看到以上信息就可以開始在命令行中使用Hive了
先試一下show tables;
結果報錯：
FAILED: Error in metadata: javax.jdo.JDOFatalInternalException: Error creating transactional connection factory
NestedThrowables:
java.lang.reflect.InvocationTargetException
FAILED: Execution Error, return code 1 from org.apache.hadoop.hive.ql.exec.DDLTask
這個錯誤出現的原因是Hive自帶的lib中沒有mysql的jar，我用的是mysql-connector-java-5.1.18-bin.jar，拷貝到HIVE_HOME/lib中
再運行，還是報錯，這次錯誤信息不一樣了
FAILED: Error in metadata: javax.jdo.JDOFatalDataStoreException: The connection property 'useUnicode' only accepts values of the form: 'true', 'false', 'yes' or 'no'. The value 'true;characterEncoding=UTF-8;createDatabaseIfNotExist=true' is not in this set.
NestedThrowables:
java.sql.SQLException: The connection property 'useUnicode' only accepts values of the form: 'true', 'false', 'yes' or 'no'. The value 'true;characterEncoding=UTF-8;createDatabaseIfNotExist=true' is not in this set.
FAILED: Execution Error, return code 1 from org.apache.hadoop.hive.ql.exec.DDLTask
這個提示還是很明確的，找到hive-site.xml中的
<property>
<name>javax.jdo.option.ConnectionURL</name>
<value>jdbc:mysql://localhost:3306/hive?useUnicode=true;characterEncoding=UTF-8;createDatabaseIfNotExist=true</value>
<description>JDBC connect string for a JDBC metastore</description>
</property>
修改爲
<property>
<name>javax.jdo.option.ConnectionURL</name>
<value>jdbc:mysql://localhost:3306/hive?useUnicode=true&characterEncoding=UTF-8&createDatabaseIfNotExist=true</value>
<description>JDBC connect string for a JDBC metastore</description>
</property>
好了繼續跑
又出錯了
FAILED: Error in metadata: javax.jdo.JDOFatalDataStoreException: Access denied for user 'root'@'localhost' (using password: YES)
NestedThrowables:
java.sql.SQLException: Access denied for user 'root'@'localhost' (using password: YES)
FAILED: Execution Error, return code 1 from org.apache.hadoop.hive.ql.exec.DDLTask
這次坑爹了，從terminal運行mysql -uroot -p是可以進去的呀
看了一下hive-site.xml，配置mysql用戶名密碼的信息爲：
<property>
<name>javax.jdo.option.ConnectionUserName</name>
<value>root</value>
<description>username to use against metastore database</description>
</property>
<property>
<name>javax.jdo.option.ConnectionPassword</name>
<value></value>
<description>password to use against metastore database</description>
</property>
沒錯呀我的用戶名是root，密碼爲空
然後就是查是否是權限開放的有問題，於是各種GRANT，改user表，都試了一遍還是不行
由於我有很多其他項目在本地都是用的root和空這套用戶名密碼，所以從一開始就不想換用戶名密碼，也就導致所有的修改都沒能成功的原因
後來想到是否是javax.jdo.option.ConnectionPassword配置爲空導致hive的程序使用了NULL而非空字符串做密碼呢
於是只能添加新的用戶名密碼了
進去mysql：mysql -uroot -p
輸入密碼
use mysql;
insert into user(Host,User,Password) values("localhost","hive",password("hive"));
FLUSH PRIVILEGES;
GRANT ALL PRIVILEGES ON hive.* TO 'hive'@'localhost' IDENTIFIED BY 'hive' WITH GRANT OPTION;
FLUSH PRIVILEGES;
然後修改hive-site.xml
<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>
再run，總算OK了
到此爲止總算是能跑了，最後那個問題應該是和密碼爲空有關，但是否是上面所說的被hive改爲了NULL，這點沒有看源碼，以後再認證吧！
我的hive版本hive-0.8.1