Unable to instantiate org.apache.hadoop.hive.ql.metadata.SessionHiveMetaStoreClient

FAILED: SemanticException org.apache.hadoop.hive.ql.metadata.HiveException: java.lang.RuntimeException: Unable to instantiate org.apache.hadoop.hive.ql.metadata.SessionHiveMetaStoreClient

在进入hive时执行命令时报出如下错，特意记录下，再stackflow 上找到如下解决方法，亲测解决，原因应该是非正常关闭hive引起的。

starting the hive metastore service worked for me. First, set up the database for hive metastore:

 $ hive --service metastore 

` https://docs.hortonworks.com/HDPDocuments/HDP2/HDP-2.3.4/bk_installing_manually_book/content/validate_installation.html

Second, run the following commands:

 $ schematool -dbType mysql -initSchema  
 $ schematool -dbType mysql -info

https://cwiki.apache.org/confluence/display/Hive/Hive+Schema+Tool