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% Fix for: https://tex.stackexchange.com/a/315027/43228
\RequirePackage{luatex85}
\documentclass[border=10pt,12pt]{standalone}
\usepackage{cfr-lm}
\usepackage{pgf}
\usepackage{tikz}
\usetikzlibrary {graphs,graphdrawing}
\usegdlibrary {force,circular,layered,trees,routing}
\begin{document}
%% sans-serif fonts, large by default, and bold too
\sffamily
\sbweight
\large
\begin{tikzpicture}[rounded corners]
%%\graph [layered layout, sibling distance=8mm, level distance=8mm]
%% \graph [simple necklace layout, node distance=4mm, nodes={circle,draw}]
%% \graph [simple necklace layout, node distance=4mm]
%%\draw [help lines] (-10,0) grid (10,20);
\graph [
tree layout,
grow=right,
sibling distance=1.5cm,
level sep=1em,
%% spring electrical layout,
%% node distance=2.5cm,
%% convergence tolerance=0.01,
%% downsize ratio=0.25,
%% spring constant=0.1,
%% cooling factor=0.9,
%% coarsen=true,
%% iterations=2000,
nodes={text height=.7em, text depth=.2em,
draw=black!20, thick, fill=blue!20, font=\footnotesize}]
{
init [circle,draw,x=-10,y=10,color=white,fill=black!70] -> single [font=\normalsize, draw=black, circle];
init -> "wait standby" [fill=violet!30];
single -> "wait primary" [font=\normalsize, draw=black];
"wait primary" -> primary [font=\normalsize, draw=black, circle];
"wait standby" -> "catching up" [fill=violet!30];
"catching up" -> secondary [circle,draw=black,circle,fill=violet!30];
primary -> "wait primary" ;
primary -> draining [fill=red!30];
draining -> demoted [fill=red!30];
primary -> demoted ;
primary -> "demote timeout" [fill=red!30];
draining -> "demote timeout" ;
"demote timeout" -> demoted ;
primary -> "apply settings" [font=\normalsize, draw=black];
"apply settings" -> primary ;
"apply settings" -> draining ;
"apply settings" -> demoted ;
"apply settings" -> "demote timeout" ;
"apply settings" -> primary ;
primary -> "prepare maintenance" [font=\normalsize, draw=black];
"prepare maintenance" -> maintenance [fill=black!20];
secondary -> "wait maintenance" [fill=violet!20];
"catching up" -> "wait maintenance" ;
"wait maintenance" -> maintenance ;
maintenance -> "catching up" ;
secondary -> "catching up" ;
secondary -> "prepare promotion" [fill=violet!30];
"catching up" -> "prepare promotion" ;
"prepare promotion" -> "stop replication" [fill=violet!30];
"stop replication" -> "wait primary" ;
"prepare promotion" -> "wait primary" ;
"demote timeout" -> primary ;
demoted -> "catching up" ;
secondary -> "report LSN" [fill=violet!30];
"catching up" -> "report LSN" ;
"report LSN" -> "prepare promotion" ;
"report LSN" -> "fast forward" [fill=violet!30];
"fast forward" -> "prepare promotion" ;
"report LSN" -> "join secondary" [fill=violet!30];
"join secondary" -> secondary ;
%% primary -> single ;
%% "wait primary" -> single ;
%% demoted -> single ;
%% "demote timeout" -> single ;
%% draining -> single ;
%% secondary -> single ;
%% "catching up" -> single ;
%% "prepare promotion" -> single ;
%% "stop replication" -> single ;
};
\end{tikzpicture}
\end{document}
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