Hi,

This week

• Finished writing common testing foundation that allows other services to be tested easily.
  For example:

--let $test_library = lzma
--source test_library.inc

--let $test_library = lzo
--source test_library.inc

...

• Finished the first draft of the Snappy service.
  Snappy has a C++ api that is used by RocksDB, so we have two options:

  • Use the mangled C++ function names directly, and load them normally with dlopen.
  • Re-implement the C++ function from Snappy’s C exports.

  The mangled function names may vary across platforms, so we are going with the second option for now.

• Implemented global status variables for the services.
  This lays the foundation for integration with the storage engines.

• Finished a first draft of the auto logic for the --use-compression= switch.

Next week

• Need to review my refactoring and decide on next steps.
  Details of refactor:

  • Removed the service struct.
  • Removed the struct from sql/sql_plugin_services.ic.
  • Define an anonymous struct in sql/compression/<library>.cc.
  • Initialize the struct with dummy function pointers.
  • If the library is successfully loaded, replace them with pointers to the real functions.
  • Define wrapper functions that forward the call to the function pointers in the struct.

• Continue replicating the implementation for other libraries.

• Decide what to do when dynamic libraries have the versions suffixed to the .so file.
  For example, liblzma.so.5.2.4 is included with Ubuntu 20, but liblzma.so is not.
  The liblzma.so -> liblzma.so.5.2.4 symlink is only added after installing the liblzma-dev package.

• Sync up with Robert to discuss further actions.

Thanks,
Kartik