解决Hive的Establishing SSL connection without server's identity verification is not recommended问题
问题描述：
hive> Sat Oct 13 15:36:32 CST 2018 WARN: Establishing SSL connection without server's identity verification is not recommended. According to MySQL 5.5.45+, 5.6.26+ and 5.7.6+ requirements SSL connection must be established by default if explicit option isn't set. For compliance with existing applications not using SSL the verifyServerCertificate property is set to 'false'. You need either to explicitly disable SSL by setting useSSL=false, or set useSSL=true and provide truststore for server certificate verification.
解决方法：
修改~/hive/conf下的hive-site.xml文件，记住Master和slave节点上都要修改
<property>
<name>javax.jdo.option.ConnectionURL</name>
<value>jdbc:mysql://Master:3306/hive?createDatabaseIfNotExist=true&useUnicode=true&characterEncoding=UTF-8&useSSL=false</value>
<description>JDBC connect string for a JDBC metastore</description>
</property>