/**
* Registers an newly incoming runtime task with the task manager.
*
* @param id the ID of the task to register
* @param jobConfiguration the job configuration that has been attached to the original job graph
* @param environment the environment of the task to be registered
* @return the task to be started or <code>null</code> if a task with the same ID was already
* running
*/
private Task createAndRegisterTask(
final ExecutionVertexID id,
final Configuration jobConfiguration,
final RuntimeEnvironment environment)
throws InsufficientResourcesException, IOException {
if (id == null) {
throw new IllegalArgumentException("Argument id is null");
}
if (environment == null) {
throw new IllegalArgumentException("Argument environment is null");
}
// Task creation and registration must be atomic
Task task;
synchronized (this) {
final Task runningTask = this.runningTasks.get(id);
boolean registerTask = true;
if (runningTask == null) {
task = new Task(id, environment, this);
} else {
if (runningTask instanceof Task) {
// Task is already running
return null;
} else {
// There is already a replay task running, we will simply restart it
task = runningTask;
registerTask = false;
}
}
if (registerTask) {
// Register the task with the byte buffered channel manager
this.channelManager.register(task);
boolean enableProfiling = false;
if (this.profiler != null
&& jobConfiguration.getBoolean(ProfilingUtils.PROFILE_JOB_KEY, true)) {
enableProfiling = true;
}
// Register environment, input, and output gates for profiling
if (enableProfiling) {
task.registerProfiler(this.profiler, jobConfiguration);
}
this.runningTasks.put(id, task);
}
}
return task;
}
/**
* Unregisters a finished or aborted task.
*
* @param id the ID of the task to be unregistered
*/
private void unregisterTask(final ExecutionVertexID id) {
// Task de-registration must be atomic
synchronized (this) {
final Task task = this.runningTasks.remove(id);
if (task == null) {
LOG.error("Cannot find task with ID " + id + " to unregister");
return;
}
// remove the local tmp file for unregistered tasks.
for (Entry<String, DistributedCacheEntry> e :
DistributedCache.readFileInfoFromConfig(task.getEnvironment().getJobConfiguration())) {
this.fileCache.deleteTmpFile(e.getKey(), e.getValue(), task.getJobID());
}
// Unregister task from the byte buffered channel manager
this.channelManager.unregister(id, task);
// Unregister task from profiling
task.unregisterProfiler(this.profiler);
// Unregister task from memory manager
task.unregisterMemoryManager(this.memoryManager);
// Unregister task from library cache manager
try {
LibraryCacheManager.unregister(task.getJobID());
} catch (IOException e) {
if (LOG.isDebugEnabled()) {
LOG.debug("Unregistering the job vertex ID " + id + " caused an IOException");
}
}
}
}
@Override
public List<TaskSubmissionResult> submitTasks(final List<TaskDeploymentDescriptor> tasks)
throws IOException {
final List<TaskSubmissionResult> submissionResultList =
new SerializableArrayList<TaskSubmissionResult>();
final List<Task> tasksToStart = new ArrayList<Task>();
// Make sure all tasks are fully registered before they are started
for (final TaskDeploymentDescriptor tdd : tasks) {
final JobID jobID = tdd.getJobID();
final ExecutionVertexID vertexID = tdd.getVertexID();
RuntimeEnvironment re;
// retrieve the registered cache files from job configuration and create the local tmp file.
Map<String, FutureTask<Path>> cpTasks = new HashMap<String, FutureTask<Path>>();
for (Entry<String, DistributedCacheEntry> e :
DistributedCache.readFileInfoFromConfig(tdd.getJobConfiguration())) {
FutureTask<Path> cp = this.fileCache.createTmpFile(e.getKey(), e.getValue(), jobID);
cpTasks.put(e.getKey(), cp);
}
try {
re =
new RuntimeEnvironment(
tdd,
this.memoryManager,
this.ioManager,
new TaskInputSplitProvider(jobID, vertexID, this.globalInputSplitProvider),
this.accumulatorProtocolProxy,
cpTasks);
} catch (Throwable t) {
final TaskSubmissionResult result =
new TaskSubmissionResult(vertexID, AbstractTaskResult.ReturnCode.DEPLOYMENT_ERROR);
result.setDescription(StringUtils.stringifyException(t));
LOG.error(result.getDescription(), t);
submissionResultList.add(result);
continue;
}
final Configuration jobConfiguration = tdd.getJobConfiguration();
// Register the task
Task task;
try {
task = createAndRegisterTask(vertexID, jobConfiguration, re);
} catch (InsufficientResourcesException e) {
final TaskSubmissionResult result =
new TaskSubmissionResult(
vertexID, AbstractTaskResult.ReturnCode.INSUFFICIENT_RESOURCES);
result.setDescription(e.getMessage());
LOG.error(result.getDescription(), e);
submissionResultList.add(result);
continue;
}
if (task == null) {
final TaskSubmissionResult result =
new TaskSubmissionResult(vertexID, AbstractTaskResult.ReturnCode.TASK_NOT_FOUND);
result.setDescription(
"Task " + re.getTaskNameWithIndex() + " (" + vertexID + ") was already running");
LOG.error(result.getDescription());
submissionResultList.add(result);
continue;
}
submissionResultList.add(
new TaskSubmissionResult(vertexID, AbstractTaskResult.ReturnCode.SUCCESS));
tasksToStart.add(task);
}
// Now start the tasks
for (final Task task : tasksToStart) {
task.startExecution();
}
return submissionResultList;
}