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Andrew Kryczka c16d5a4fda Makefile support to statically link external plugin code (#7918) 
Summary:
Added support for detecting plugins linked in the "plugin/" directory and building them from our Makefile in a standardized way. See "plugin/README.md" for details. An example of a plugin that can be built in this way can be found in https://github.com/ajkr/dedupfs.

There will be more to do in terms of making this process more convenient and adding support for CMake.

Pull Request resolved: https://github.com/facebook/rocksdb/pull/7918

Test Plan: my own plugin (https://github.com/ajkr/dedupfs) and also heard this patch worked with ZenFS.

Reviewed By: pdillinger

Differential Revision: D26189969

Pulled By: ajkr

fbshipit-source-id: 6624d4357d0ffbaedb42f0d12a3fcb737c78f758
 		2021-02-10 08:35:34 -08:00
..
README.md Makefile support to statically link external plugin code (#7918) 2021-02-10 08:35:34 -08:00

README.md

Building external plugins together with RocksDB

RocksDB offers several plugin interfaces for developers to customize its behavior. One difficulty developers face is how to make their plugin available to end users. The approach discussed here involves building the external code together with the RocksDB code into a single binary. Note another approach we plan to support involves loading plugins dynamically from shared libraries.

Discovery

We hope developers will mention their work in "PLUGINS.md" so users can easily discover and reuse solutions for customizing RocksDB.

Directory organization

External plugins will be linked according to their name into a subdirectory of "plugin/". For example, a plugin called "dedupfs" would be linked into "plugin/dedupfs/".

Build standard

Currently the only supported build system is make. In the plugin directory, files ending in the .mk extension can define the following variables.

  • $(PLUGIN_NAME)_SOURCES: these files will be compiled and linked with RocksDB. They can access RocksDB public header files.
  • $(PLUGIN_NAME)_HEADERS: these files will be installed in the RocksDB header directory. Their paths will be prefixed by "rocksdb/plugin/$(PLUGIN_NAME)/".
  • $(PLUGIN_NAME)_LDFLAGS: these flags will be passed to the final link step. For example, library dependencies can be propagated here, or symbols can be forcibly included, e.g., for static registration.

Users will run the usual make commands from the RocksDB directory, specifying the plugins to include in a space-separated list in the variable ROCKSDB_PLUGINS.

Example

For a working example, see Dedupfs.