private void addLeafTask(TaskAttemptToSchedulerEvent event) {
TaskAttempt taskAttempt = event.getTaskAttempt();
List<DataLocation> locations = taskAttempt.getTask().getDataLocations();
for (DataLocation location : locations) {
String host = location.getHost();
leafTaskHosts.add(host);
HostVolumeMapping hostVolumeMapping = leafTaskHostMapping.get(host);
if (hostVolumeMapping == null) {
String rack = RackResolver.resolve(host).getNetworkLocation();
hostVolumeMapping = new HostVolumeMapping(host, rack);
leafTaskHostMapping.put(host, hostVolumeMapping);
}
hostVolumeMapping.addTaskAttempt(location.getVolumeId(), taskAttempt);
if (LOG.isDebugEnabled()) {
LOG.debug("Added attempt req to host " + host);
}
HashSet<TaskAttemptId> list = leafTasksRackMapping.get(hostVolumeMapping.getRack());
if (list == null) {
list = new HashSet<>();
leafTasksRackMapping.put(hostVolumeMapping.getRack(), list);
}
list.add(taskAttempt.getId());
if (LOG.isDebugEnabled()) {
LOG.debug("Added attempt req to rack " + hostVolumeMapping.getRack());
}
}
leafTasks.add(taskAttempt.getId());
}
private Set<String> resolveRacks(List<String> nodes) {
Set<String> racks = new HashSet<String>();
if (nodes != null) {
for (String node : nodes) {
// Ensure node requests are accompanied by requests for
// corresponding rack
String rack = RackResolver.resolve(node).getNetworkLocation();
if (rack == null) {
LOG.warn("Failed to resolve rack for node " + node + ".");
} else {
racks.add(rack);
}
}
}
return racks;
}
private TaskAttemptId allocateRackTask(String host) {
List<HostVolumeMapping> remainingTasks = Lists.newArrayList(leafTaskHostMapping.values());
String rack = RackResolver.resolve(host).getNetworkLocation();
TaskAttemptId attemptId = null;
if (remainingTasks.size() > 0) {
synchronized (scheduledRequests) {
// find largest remaining task of other host in rack
Collections.sort(
remainingTasks,
new Comparator<HostVolumeMapping>() {
@Override
public int compare(HostVolumeMapping v1, HostVolumeMapping v2) {
// descending remaining tasks
if (v2.remainTasksNum.get() > v1.remainTasksNum.get()) {
return 1;
} else if (v2.remainTasksNum.get() == v1.remainTasksNum.get()) {
return 0;
} else {
return -1;
}
}
});
}
for (HostVolumeMapping tasks : remainingTasks) {
for (int i = 0; i < tasks.getRemainingLocalTaskSize(); i++) {
TaskAttemptId tId = tasks.getTaskAttemptIdByRack(rack);
if (tId == null) break;
if (leafTasks.contains(tId)) {
leafTasks.remove(tId);
attemptId = tId;
break;
}
}
if (attemptId != null) break;
}
}
// find task in rack
if (attemptId == null) {
HashSet<TaskAttemptId> list = leafTasksRackMapping.get(rack);
if (list != null) {
synchronized (list) {
Iterator<TaskAttemptId> iterator = list.iterator();
while (iterator.hasNext()) {
TaskAttemptId tId = iterator.next();
iterator.remove();
if (leafTasks.contains(tId)) {
leafTasks.remove(tId);
attemptId = tId;
break;
}
}
}
}
}
return attemptId;
}