StefanRRichter opened a new pull request #8038: [FLINK-11953] Introduce Plugin/Loading system and integrate it with FileSystem URL: https://github.com/apache/flink/pull/8038 ## What is the purpose of the change We want to change the general architecture for loading FileSystems in Flink to a plugin architecture. The advantage of this change is that it would invert the classloading from parent-first to child-first and therefore enables us to move away from shading to avoid class/version conflics. Note that this general approach could also be used in other places for Flink in the future, but this task is targetting only the file systems for now. Furthermore, this is the first PR, introducing the general mechanism. We still need followup work with changes to the build and shipping/providing the plugin folder. ## Brief change log - Made {{ChildFirstClassLoader}} a toplevel class.and move to flink core. - Introduce {{Plugin}} interface, {{PluginLoader}}, {{PluginManager}} for basic plugin mechanism. - Introduce init of plugin manager singleton to process entry points. - Integrate plugin mechanism with {{FileSystem}} class. ## Verifying this change Added unit tests. ## Does this pull request potentially affect one of the following parts: - Dependencies (does it add or upgrade a dependency): ( no) - The public API, i.e., is any changed class annotated with `@Public(Evolving)`: (yes) - The serializers: (no) - The runtime per-record code paths (performance sensitive): (no) - Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, Yarn/Mesos, ZooKeeper: (yes) - The S3 file system connector: (yes) ## Documentation - Does this pull request introduce a new feature? (yes) - If yes, how is the feature documented? (feature not yet compelted)
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