具体报错：
Metastore connection URL: jdbc:mysql://hm02:3306/hive?createDatabaseIfNotExist=true
Metastore Connection Driver : com.mysql.cj.jdbc.Driver
Metastore connection User: hive
org.apache.hadoop.hive.metastore.HiveMetaException: Failed to get schema version.
Underlying cause: com.mysql.cj.jdbc.exceptions.CommunicationsException : Communications link failure
The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.
SQL Error code: 0
Use --verbose for detailed stacktrace.
*** schemaTool failed ***
原因及解决方案：
说来惭愧，自己都想打自己（这个问题困扰了我一整天）&#
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