hive的元数据存储在mysql后,报错的解决方法！

因为要实现多人开发Hive，所以需要将hive的元数据存储在mysql。配置完成后，配置之前hive中创建的数据表在show tables时都不会出现，但hdfs数据文件都还在。
当在hive中drop table 时如果报以下错时

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！