zeppelin-web/src/app/visualization/builtins/visualization-scatterchart.js (5 lines):
	- line 69: chart.xAxis.tickFormat(function(d) { // TODO remove round after bump to nvd3 > 1.8.5
	- line 73: chart.yAxis.tickFormat(function(d) { // TODO remove round after bump to nvd3 > 1.8.5
	- line 168: let epsilon = 1e-4; // TODO remove after bump to nvd3 > 1.8.5
	- line 205: // TODO remove epsilon jitter after bump to nvd3 > 1.8.5
	- line 222: // TODO remove sort and dedup after bump to nvd3 > 1.8.5


zeppelin-zengine/src/main/java/org/apache/zeppelin/notebook/FileSystemStorage.java (1 line):
	- line 172: // recursive search path, (TODO zjffdu, list folder in sub folder on demand, instead of load all


zeppelin-web/src/app/visualization/builtins/visualization-nvd3chart.js (1 line):
	- line 210: // TODO - This part could use som refactoring - Weird if/else with similar actions and variable names


shell/src/main/resources/html/js/index.js (1 line):
	- line 104: // TODO:(Xun) Support multiple style themes


zeppelin-zengine/src/main/java/org/apache/zeppelin/interpreter/InterpreterSetting.java (1 line):
	- line 565: * (TODO zjffdu), we should remove these ungly code after we unify the interpreter properties in