conf.set(JTConfig.JT_HTTP_ADDRESS, "0.0.0.0:0");
conf.setClass("topology.node.switch.mapping.impl",
StaticMapping.class, DNSToSwitchMapping.class);
conf.set(JTConfig.JT_INSTRUMENTATION,
FakeJobTrackerMetricsInst.class.getName());
jobTracker = new FakeJobTracker(conf, new FakeClock(), trackers);
fakeInst = (FakeJobTrackerMetricsInst) jobTracker.getInstrumentation();
// Set up the Topology Information
for (int i = 0; i < allHosts.length; i++) {
StaticMapping.addNodeToRack(allHosts[i], allRacks[i]);
}