hive 安装 bug汇总

一  Unable to instantiate org.apache.hadoop.hive.metastore.HiveMetaStoreClient
1  hive配置文件的问题
   初学者只要使用数据库连接的属性就可以啦

<property>
  <name>javax.jdo.option.ConnectionURL</name>
  <value>jdbc:mysql://127.0.0.1:3306/metastore_db?createDatabaseIfNotExist=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>a123</value>
  <description>password to use against metastore database</description>
</property>

  参考： http://bo-hai.iteye.com/blog/1880930
2 连接不上数据库
   这里有多种原因，我列举几条
   （1） 连接数据库的username和password不正确。
   （2）usernam的权限不够
   （3）端口号写错数据库名（我写了数据库名）

二
FAILED: Error in metadata: javax.jdo.JDODataStoreException: Error(s) were found while auto-creating/validating the datastore for classes. The errors are printed in the log, and are attached to this exception.
NestedThrowables:
com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Specified key was too long; max key length is 767 bytes
FAILED: Execution Error, return code 1 from org.apache.hadoop.hive.ql.exec.DDLTask

解决的方法是到mysql中的hive数据库里执行 alter database hive character set latin1;改变hive元数据库的字符集，问题就可以解决！

参考： http://www.cnblogs.com/Blueren/archive/2011/06/29/Sir_001.html

三
show tables; 正常
创建表，抛出异常

Cannot create directory /user/hive/warehouse/test. Name node is in safe mode.

google找到

your NN is not coming out of safemode. it should do that automatically after a few seconds. use this command to come out of it manually :
bin/hadoop dfsadmin -safemode leave
then retry with your command.

使用   bin/hadoop dfsadmin -safemode leave  就可以解决