/** Process incoming heartbeat messages from the task trackers. */
public synchronized int emitHeartbeat(TaskTrackerStatus trackerStatus, boolean initialContact) {
String trackerName = trackerStatus.getTrackerName();
trackerStatus.setLastSeen(System.currentTimeMillis());
synchronized (taskTrackers) {
synchronized (trackerExpiryQueue) {
boolean seenBefore = updateTaskTrackerStatus(trackerName, trackerStatus);
if (initialContact) {
// If it's first contact, then clear out any state hanging around
if (seenBefore) {
lostTaskTracker(trackerName);
}
} else {
// If not first contact, there should be some record of the tracker
if (!seenBefore) {
return InterTrackerProtocol.UNKNOWN_TASKTRACKER;
}
}
if (initialContact) {
trackerExpiryQueue.add(trackerStatus);
}
}
}
updateTaskStatuses(trackerStatus);
// LOG.info("Got heartbeat from "+trackerName);
return InterTrackerProtocol.TRACKERS_OK;
}
public Set<String> getOutputReactions(Rxn r) {
TreeSet<String> rxns = new TreeSet<String>();
for (String rn : reactions.keySet()) {
Rxn rxn = reactions.get(rn);
if (r.connects(rxn)) {
rxns.add(rn);
}
}
return rxns;
}
///////////////////////////////////////////////////////
// Maintain lookup tables; called by JobInProgress
// and TaskInProgress
///////////////////////////////////////////////////////
void createTaskEntry(String taskid, String taskTracker, TaskInProgress tip) {
LOG.info(
"Adding task '"
+ taskid
+ "' to tip "
+ tip.getTIPId()
+ ", for tracker '"
+ taskTracker
+ "'");
// taskid --> tracker
taskidToTrackerMap.put(taskid, taskTracker);
// tracker --> taskid
TreeSet taskset = (TreeSet) trackerToTaskMap.get(taskTracker);
if (taskset == null) {
taskset = new TreeSet();
trackerToTaskMap.put(taskTracker, taskset);
}
taskset.add(taskid);
// taskid --> TIP
taskidToTIPMap.put(taskid, tip);
}