Examples with TerminationEvent org.apache.flink.runtime.iterative.event.TerminationEvent used on opensource projects

Example 1 with TerminationEvent

use of org.apache.flink.runtime.iterative.event.TerminationEvent in project flink by apache.

the class IterationSynchronizationSinkTask method invoke.

// --------------------------------------------------------------------------------------------
@Override
public void invoke() throws Exception {
    this.headEventReader = new MutableRecordReader<>(getEnvironment().getInputGate(0), getEnvironment().getTaskManagerInfo().getTmpDirectories());
    TaskConfig taskConfig = new TaskConfig(getTaskConfiguration());
    // store all aggregators
    this.aggregators = new HashMap<>();
    for (AggregatorWithName<?> aggWithName : taskConfig.getIterationAggregators(getUserCodeClassLoader())) {
        aggregators.put(aggWithName.getName(), aggWithName.getAggregator());
    }
    // store the aggregator convergence criterion
    if (taskConfig.usesConvergenceCriterion()) {
        convergenceCriterion = taskConfig.getConvergenceCriterion(getUserCodeClassLoader());
        convergenceAggregatorName = taskConfig.getConvergenceCriterionAggregatorName();
        Preconditions.checkNotNull(convergenceAggregatorName);
    }
    // store the default aggregator convergence criterion
    if (taskConfig.usesImplicitConvergenceCriterion()) {
        implicitConvergenceCriterion = taskConfig.getImplicitConvergenceCriterion(getUserCodeClassLoader());
        implicitConvergenceAggregatorName = taskConfig.getImplicitConvergenceCriterionAggregatorName();
        Preconditions.checkNotNull(implicitConvergenceAggregatorName);
    }
    maxNumberOfIterations = taskConfig.getNumberOfIterations();
    // set up the event handler
    int numEventsTillEndOfSuperstep = taskConfig.getNumberOfEventsUntilInterruptInIterativeGate(0);
    eventHandler = new SyncEventHandler(numEventsTillEndOfSuperstep, aggregators, getEnvironment().getUserClassLoader());
    headEventReader.registerTaskEventListener(eventHandler, WorkerDoneEvent.class);
    IntValue dummy = new IntValue();
    while (!terminationRequested()) {
        if (log.isInfoEnabled()) {
            log.info(formatLogString("starting iteration [" + currentIteration + "]"));
        }
        // this call listens for events until the end-of-superstep is reached
        readHeadEventChannel(dummy);
        if (log.isInfoEnabled()) {
            log.info(formatLogString("finishing iteration [" + currentIteration + "]"));
        }
        if (checkForConvergence()) {
            if (log.isInfoEnabled()) {
                log.info(formatLogString("signaling that all workers are to terminate in iteration [" + currentIteration + "]"));
            }
            requestTermination();
            sendToAllWorkers(new TerminationEvent());
        } else {
            if (log.isInfoEnabled()) {
                log.info(formatLogString("signaling that all workers are done in iteration [" + currentIteration + "]"));
            }
            AllWorkersDoneEvent allWorkersDoneEvent = new AllWorkersDoneEvent(aggregators);
            sendToAllWorkers(allWorkersDoneEvent);
            // reset all aggregators
            for (Aggregator<?> agg : aggregators.values()) {
                agg.reset();
            }
            currentIteration++;
        }
    }
}