@Override
public Object[] toArray() {
return queue.toArray();
}
@Override
public <T> T[] toArray(T[] a) {
return queue.toArray(a);
}
public void start(String configFileName, Reporter reporter)
throws PropertiesException, ConectionToExecNodesException, ChannelException,
WorkerInstantiationException, TaskInstantiationException, StartFailureException {
this.reporter = reporter;
reporter.report(1, "MasterServant::start - Lendo configuracoes de " + configFileName);
/* lê arquivo de configuração */
if (!getProperties(configFileName)) {
throw new PropertiesException();
}
reporter.report(1, "MasterServant::start - Arquivo de configuracao lido");
/* cria objeto que inicializa workers e fila de tarefas */
try {
initializer = new WorkerInitializer(this);
} catch (Exception e) {
throw new WorkerInstantiationException();
}
reporter.report(1, "MasterServant::start - WorkerInitializer instanciado");
/* conecta-se com os execution nodes dos workers*/
reporter.report(1, "MasterServant::start - Conectando aos outros execution nodes");
hashNodes = this.initializer.connectToExecNodes();
if (hashNodes == null) {
throw new ConectionToExecNodesException();
}
reporter.report(1, "MasterServant::start - Conectado ao execution node dos workers");
/* cria canal de evento entre master e workers*/
reporter.report(1, "MasterServant::start - Criando canal de evento entre master e workers");
channel = initializer.buildChannel();
if (channel == null) {
throw new ChannelException();
}
/*instancia workers*/
reporter.report(1, "MasterServant::start - Instanciando Workers");
workerQueue = initializer.buildWorkerQueue();
if (workerQueue == null) {
throw new WorkerInstantiationException();
}
/*instancia tarefas*/
reporter.report(1, "MasterServant::start - Instanciando Tarefas");
ioformat = initializer.createIOFormatServant(ioformatClassName);
if (ioformat == null) {
throw new TaskInstantiationException();
}
taskQueue = initializer.buildTaskQueue();
if ((taskQueue == null) || (taskQueue.toArray().length == 0)) {
throw new TaskInstantiationException();
}
num_partitions = taskQueue.toArray().length;
/* inicia escalonamento das tarefas map-reduce*/
reporter.report(1, "MasterServant::start - Iniciando escalonamento");
if (!schedule()) {
initializer.finish();
throw new StartFailureException();
}
initializer.finish();
}