GuzikJakub opened a new pull request #4708: [AIRFLOW-3888] HA for metastore 
connection
URL: https://github.com/apache/airflow/pull/4708
 
 
   ### Jira
   
   https://issues.apache.org/jira/browse/AIRFLOW-3888
   
   ### Description
   
   Creating a connection to a metasotor with two hosts for high avitablity (eg 
connection 1, connection 2) is not possible because the entire value entered is 
taken. For our needs, it is necessary to go through subsequent hosts and 
connect to the first working.
   
   This change allows you to check and then connect to a working metastor.
   
   ### Tests
   
   Tested on two metastore, of which one was always inactive
   
   Example:
   matastore1(offline); metastoer2(online).
   In this case, we will connect to metastore2
   
   ### Documentation
   
   The connection is created in the webserver. We separate the metastore with a 
semicolon, eg: metastror1; metastore2; metastore3
   

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