This is the call graph of braft, an industrial grade raft implementation, which may help you understand braft better, I guess.

I made it several months ago with dot-lang (graphviz), and build the svg with my graphviz plugin, the nodes are clickable.

I also have made call graphs of other projects such as thrift, brpc and etc.. They will be posted when I have time to eliminate the parts that are not proper for publication.

Legend:

• each enclosed shape is called a node
  • ellipse for procedure
  • square for note/comment
• solid arrow for “sync” call/procedure
• dash connection or dash arrow for “async” call/procedure or something that is indirectly associated, e.g., background thread, queue of a thread pool
• number on the connection means process sequence
• element in red color means important

(click this image to get svg view with interaction)