Update deployment runtime to Node 8.9.x

README.md

@@ -10,7 +10,7 @@ To deploy a frontend-only React app, use the static-site optimized
 
 ## Design Points
 
-A combo of two npm projects, the backend server and the frontend UI. So there are two `package.json` configs and thereforce two places to run `npm` commands:
+A combo of two npm projects, the backend server and the frontend UI. So there are two `package.json` configs.
 
   1. [`package.json`](package.json) for [Node server](server/) & [Heroku deploy](https://devcenter.heroku.com/categories/deployment)
       * `heroku-postbuild` script compiles the webpack bundle during deploy
@@ -18,7 +18,6 @@ A combo of two npm projects, the backend server and the frontend UI. So there ar
   2. [`react-ui/package.json`](react-ui/package.json) for [React web UI](react-ui/)
       * generated by [create-react-app](https://github.com/facebookincubator/create-react-app)
 
-Includes a minimal [Node Cluster](https://nodejs.org/docs/latest-v8.x/api/cluster.html) [implementation](server/index.js) to parallelize the single-threaded Node process across the available CPU cores.
 
 ## Demo
 

server/index.js

@@ -1,25 +1,8 @@
 const express = require('express');
 const path = require('path');
-const cluster = require('cluster');
-const numCPUs = require('os').cpus().length;
 
-const PORT = process.env.PORT || 5000;
-
-// Multi-process to utilize all CPU cores.
-if (cluster.isMaster) {
-  console.error(`Node cluster master ${process.pid} is running`);
-
-  // Fork workers.
-  for (let i = 0; i < numCPUs; i++) {
-    cluster.fork();
-  }
-
-  cluster.on('exit', (worker, code, signal) => {
-    console.error(`Node cluster worker ${worker.process.pid} exited: code ${code}, signal ${signal}`);
-  });
-
-} else {
 const app = express();
+const PORT = process.env.PORT || 5000;
 
 // Priority serve any static files.
 app.use(express.static(path.resolve(__dirname, '../react-ui/build')));
@@ -36,6 +19,5 @@ if (cluster.isMaster) {
 });
 
 app.listen(PORT, function () {
-    console.error(`Node cluster worker ${process.pid}: listening on port ${PORT}`);
+  console.log(`Listening on port ${PORT}`);
 });
-}