gaborgsomogyi opened a new pull request #28019: [SPARK-31021][SQL] Support MariaDB Kerberos login in JDBC connector URL: https://github.com/apache/spark/pull/28019 ### What changes were proposed in this pull request? When loading DataFrames from JDBC datasource with Kerberos authentication, remote executors (yarn-client/cluster etc. modes) fail to establish a connection due to lack of Kerberos ticket or ability to generate it. This is a real issue when trying to ingest data from kerberized data sources (SQL Server, Oracle) in enterprise environment where exposing simple authentication access is not an option due to IT policy issues. In this PR I've added MariaDB support (other supported databases will come in later PRs). What this PR contains: * Introduced `SecureConnectionProvider` and added basic secure functionalities * Added `MariaDBConnectionProvider` * Added `MariaDBConnectionProviderSuite` * Added `MariaDBKrbIntegrationSuite` docker integration test * Added some missing code documentation ### Why are the changes needed? Missing JDBC kerberos support. ### Does this PR introduce any user-facing change? Yes, now user is able to connect to MariaDB using kerberos. ### How was this patch tested? * Additional + existing unit tests * Additional + existing integration tests * Test on cluster manually
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