Code restructure

[zkaoudi]

Currently, there are some modules that the source code is not in the usual path of "[module_name]/src/main/java" but inside a "code" folder. This is not the case for all modules. We should restructure the code to be as it is done usually: "[module_name]/src/main/java"

NOTE: It seems that this "code" folder was created because of some incompatibility with GraphChi and the java/scala versions. So we may have to discard GraphChi

[novatechflow]

+1 to retire GraphChi. We should also consider retiring Java 8 support.

[bgeng777]

+1 for the restructure and retire GraphChi. If we want to take a further step after removing GraphChi, it is worthwhile to consider retiring Scala2.11 as well.
The underlying engines have done such removal:
Spark dropped Scala2.11 since Spark3.0. See here
Flink dropped Scala2.11 since Flink1.15. See here
It can reduce matainers' bandwidth on different scala version. Feel free to correct me if I miss some potential dependency on Scala2.11 in Wayang. :)

[novatechflow]

+1

One reason the ../code/.. directories exist is to avoid multiple Scala versions deps within the same project. So If it is needed to support multiple versions, maybe a strategy like 1 branch/version would be a good idea to avoid code duplication due to deps with different versions.

[novatechflow]

bump

[zkaoudi]

What about retiring scala 2.11?

[kbeedkar]

+1

[juripetersen]

I will take care of implementing the restructure of this issue.

[zkaoudi]

Great! Thanks Juri!