fix: lib name match with NativeLibraryLoader ROCKSDB_LIBRARY_NAME value

[Clement-Cardot]

Hi there,

Is it normal that this value is not the same as the ROCKSDB_LIBRARY_NAME in NativeLibraryLoader.java ?
This cause an error if you try to load the .so manually and then load RockDB, see example below :

String customDir = "/custom/path/";
NativeLibraryLoader.getInstance().loadLibrary(customDir);
RocksDB.loadLibrary(customDir);

• The NativeLibraryLoader.getInstance().loadLibrary(customDir) will load a file named librocksdbjni-linux64.so
• But the RocksDB.loadLibrary(customDir) will try to find librocksdbjnijni-linux64.so (NB: jnijni)

I assume it's not on purpose but let me now if there is a good reason for that !

And if you want to know why I need to load the .so manually :
On securized linux environnement, the /tmp does not allow to dynamically link libs (see this message for more info : docker-flink/docker-flink#46 (comment))
As I can't neither change that or change the java.io.tmpdir to an other path (because I want the rest of my temporary files to stay in the /tmp dir). I'm forced to load the .so manually.

Also I now that I could use the ROCKSDB_SHAREDLIB_DIR environnement variable, but I don't want that my code depends on environments values (for many reasons)

Edit: I find out that by calling RocksDB.loadLibrary() without the path, the function find out that the lib has already been loaded thanks to the "initialized" variable in the NativeLibraryLoader class.

String customDir = "/custom/path/";
NativeLibraryLoader.getInstance().loadLibrary(customDir);
RocksDB.loadLibrary();

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[adamretter]

@Clement-Cardot Thanks for the PR and comments, let me take a look into this and come back to you...

[Clement-Cardot]

Thanks @adamretter

Btw, I just figured out that i don't even need to call RocksDB.loadLibrary()
So no real "bug".
But i think it is still a typo issue :)