A demonstration on how to pass data from a killed worker to a new one when using Node.js cluster module. More information at http://a.ndri.us/blog/node-js-cluster-worker-persistent-data

cluster_worker_persistent_data.js

var cluster = require('cluster');

if (true === cluster.isMaster) {
    var map = {};

    function forkWorker(data) {
        var worker = cluster.fork({data: data});
        map[worker.id] = data;
    }

    forkWorker('Alice');
    forkWorker('Bob');
    forkWorker('Ted');

    cluster.on('exit', function (worker, code, signal) {
        console.log(worker.process.env.data); // This will be undefined. Therefore we need a map.

        var data = map[worker.id]; 
        delete map[worker.id]; // We don't need old id mapping.

        forkWorker(data);
    });
} else {
    console.log(process.env.data); 
}