[GitHub] [airflow] potiuk commented on issue #4938: [AIRFLOW-4117] Multi-staging Image - Travis CI tests [Step 3/3]

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potiuk commented on issue #4938: [AIRFLOW-4117] Multi-staging Image - Travis CI tests [Step 3/3]
URL: https://github.com/apache/airflow/pull/4938#issuecomment-479432212
 
 
   @Fokko  -> i understand being busy. I am quite busy myself now so I move it in a slower pace than I would like to (the remainig tests and kubernetes parts). 
   
   Answering the mysql part -> we are only installing client libraries for mysql not the server ones. Our python mysql library(https://pypi.org/project/mysqlclient/)  requires mysql-client and libmysqlclient-dev native libraries to be installed. Since we are using debian-stretch as a base (this is what official python images use as a base), default mysql libraries are actually mariadb ones not the "oracle mysql" ones. They are supposed to be compatible (mariadb is fork of mysql).
   
   I figured that Airflow's target is the original "MySQL" rather than "MariaDB" so I think using "official" libs from Oracle might be better choice for CI build - that's why we have separate step to install Oracle libs (following official instructions). It's a bit long because you need to install Oracle Keys and set-up repos, but it boils down to:
   
   `apt-get install --no-install-recommends -y mysql-client libmysqlclient-dev
   `
   
   Note that Ubuntu has Oracle MySQL installed by default rather than MariaDB, so I guess most of airflow users will also have the MySQL client rather than MariaDB.
   
   

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