Examples with CancelTaskException org.apache.flink.runtime.execution.CancelTaskException used on opensource projects

Example 6 with CancelTaskException

use of org.apache.flink.runtime.execution.CancelTaskException in project flink by apache.

the class LocalInputChannel method getNextBuffer.

@Override
BufferAndAvailability getNextBuffer() throws IOException, InterruptedException {
    checkError();
    ResultSubpartitionView subpartitionView = this.subpartitionView;
    if (subpartitionView == null) {
        // this can happen if the request for the partition was triggered asynchronously
        // by the time trigger
        // would be good to avoid that, by guaranteeing that the requestPartition() and
        // getNextBuffer() always come from the same thread
        // we could do that by letting the timer insert a special "requesting channel" into the input gate's queue
        subpartitionView = checkAndWaitForSubpartitionView();
    }
    Buffer next = subpartitionView.getNextBuffer();
    if (next == null) {
        if (subpartitionView.isReleased()) {
            throw new CancelTaskException("Consumed partition " + subpartitionView + " has been released.");
        } else {
            // notifications.
            throw new IllegalStateException("Consumed partition has no buffers available. " + "Number of received buffer notifications is " + numBuffersAvailable + ".");
        }
    }
    long remaining = numBuffersAvailable.decrementAndGet();
    if (remaining >= 0) {
        numBytesIn.inc(next.getSize());
        return new BufferAndAvailability(next, remaining > 0);
    } else if (subpartitionView.isReleased()) {
        throw new ProducerFailedException(subpartitionView.getFailureCause());
    } else {
        throw new IllegalStateException("No buffer available and producer partition not released.");
    }
}

Example 7 with CancelTaskException

use of org.apache.flink.runtime.execution.CancelTaskException in project flink by apache.

the class StreamTask method invoke.

@Override
public final void invoke() throws Exception {
    boolean disposed = false;
    try {
        // -------- Initialize ---------
        LOG.debug("Initializing {}.", getName());
        asyncOperationsThreadPool = Executors.newCachedThreadPool();
        configuration = new StreamConfig(getTaskConfiguration());
        stateBackend = createStateBackend();
        accumulatorMap = getEnvironment().getAccumulatorRegistry().getUserMap();
        // if the clock is not already set, then assign a default TimeServiceProvider
        if (timerService == null) {
            ThreadFactory timerThreadFactory = new DispatcherThreadFactory(TRIGGER_THREAD_GROUP, "Time Trigger for " + getName());
            timerService = new SystemProcessingTimeService(this, getCheckpointLock(), timerThreadFactory);
        }
        operatorChain = new OperatorChain<>(this);
        headOperator = operatorChain.getHeadOperator();
        // task specific initialization
        init();
        // save the work of reloading state, etc, if the task is already canceled
        if (canceled) {
            throw new CancelTaskException();
        }
        // -------- Invoke --------
        LOG.debug("Invoking {}", getName());
        // executed before all operators are opened
        synchronized (lock) {
            // both the following operations are protected by the lock
            // so that we avoid race conditions in the case that initializeState()
            // registers a timer, that fires before the open() is called.
            initializeState();
            openAllOperators();
        }
        // final check to exit early before starting to run
        if (canceled) {
            throw new CancelTaskException();
        }
        // let the task do its work
        isRunning = true;
        run();
        // make sure the "clean shutdown" is not attempted
        if (canceled) {
            throw new CancelTaskException();
        }
        // make sure all timers finish and no new timers can come
        timerService.quiesceAndAwaitPending();
        LOG.debug("Finished task {}", getName());
        // at the same time, this makes sure that during any "regular" exit where still
        synchronized (lock) {
            isRunning = false;
            // this is part of the main logic, so if this fails, the task is considered failed
            closeAllOperators();
        }
        LOG.debug("Closed operators for task {}", getName());
        // make sure all buffered data is flushed
        operatorChain.flushOutputs();
        // make an attempt to dispose the operators such that failures in the dispose call
        // still let the computation fail
        tryDisposeAllOperators();
        disposed = true;
    } finally {
        // clean up everything we initialized
        isRunning = false;
        // stop all timers and threads
        if (timerService != null) {
            try {
                timerService.shutdownService();
            } catch (Throwable t) {
                // catch and log the exception to not replace the original exception
                LOG.error("Could not shut down timer service", t);
            }
        }
        // stop all asynchronous checkpoint threads
        try {
            cancelables.close();
            shutdownAsyncThreads();
        } catch (Throwable t) {
            // catch and log the exception to not replace the original exception
            LOG.error("Could not shut down async checkpoint threads", t);
        }
        // we must! perform this cleanup
        try {
            cleanup();
        } catch (Throwable t) {
            // catch and log the exception to not replace the original exception
            LOG.error("Error during cleanup of stream task", t);
        }
        // if the operators were not disposed before, do a hard dispose
        if (!disposed) {
            disposeAllOperators();
        }
        // release the output resources. this method should never fail.
        if (operatorChain != null) {
            operatorChain.releaseOutputs();
        }
    }
}

Example 8 with CancelTaskException

use of org.apache.flink.runtime.execution.CancelTaskException in project flink by apache.

the class DataSourceTask method invoke.

@Override
public void invoke() throws Exception {
    // --------------------------------------------------------------------
    // Initialize
    // --------------------------------------------------------------------
    initInputFormat();
    LOG.debug(getLogString("Start registering input and output"));
    try {
        initOutputs(getUserCodeClassLoader());
    } catch (Exception ex) {
        throw new RuntimeException("The initialization of the DataSource's outputs caused an error: " + ex.getMessage(), ex);
    }
    LOG.debug(getLogString("Finished registering input and output"));
    // --------------------------------------------------------------------
    // Invoke
    // --------------------------------------------------------------------
    LOG.debug(getLogString("Starting data source operator"));
    RuntimeContext ctx = createRuntimeContext();
    Counter completedSplitsCounter = ctx.getMetricGroup().counter("numSplitsProcessed");
    ((OperatorMetricGroup) ctx.getMetricGroup()).getIOMetricGroup().reuseInputMetricsForTask();
    Counter numRecordsOut = ((OperatorMetricGroup) ctx.getMetricGroup()).getIOMetricGroup().getNumRecordsOutCounter();
    if (this.config.getNumberOfChainedStubs() == 0) {
        ((OperatorMetricGroup) ctx.getMetricGroup()).getIOMetricGroup().reuseOutputMetricsForTask();
    }
    if (RichInputFormat.class.isAssignableFrom(this.format.getClass())) {
        ((RichInputFormat) this.format).setRuntimeContext(ctx);
        LOG.debug(getLogString("Rich Source detected. Initializing runtime context."));
        ((RichInputFormat) this.format).openInputFormat();
        LOG.debug(getLogString("Rich Source detected. Opening the InputFormat."));
    }
    ExecutionConfig executionConfig = getExecutionConfig();
    boolean objectReuseEnabled = executionConfig.isObjectReuseEnabled();
    LOG.debug("DataSourceTask object reuse: " + (objectReuseEnabled ? "ENABLED" : "DISABLED") + ".");
    final TypeSerializer<OT> serializer = this.serializerFactory.getSerializer();
    try {
        // start all chained tasks
        BatchTask.openChainedTasks(this.chainedTasks, this);
        // get input splits to read
        final Iterator<InputSplit> splitIterator = getInputSplits();
        // for each assigned input split
        while (!this.taskCanceled && splitIterator.hasNext()) {
            // get start and end
            final InputSplit split = splitIterator.next();
            LOG.debug(getLogString("Opening input split " + split.toString()));
            final InputFormat<OT, InputSplit> format = this.format;
            // open input format
            format.open(split);
            LOG.debug(getLogString("Starting to read input from split " + split.toString()));
            try {
                final Collector<OT> output = new CountingCollector<>(this.output, numRecordsOut);
                if (objectReuseEnabled) {
                    OT reuse = serializer.createInstance();
                    // as long as there is data to read
                    while (!this.taskCanceled && !format.reachedEnd()) {
                        OT returned;
                        if ((returned = format.nextRecord(reuse)) != null) {
                            output.collect(returned);
                        }
                    }
                } else {
                    // as long as there is data to read
                    while (!this.taskCanceled && !format.reachedEnd()) {
                        OT returned;
                        if ((returned = format.nextRecord(serializer.createInstance())) != null) {
                            output.collect(returned);
                        }
                    }
                }
                if (LOG.isDebugEnabled() && !this.taskCanceled) {
                    LOG.debug(getLogString("Closing input split " + split.toString()));
                }
            } finally {
                // close. We close here such that a regular close throwing an exception marks a task as failed.
                format.close();
            }
            completedSplitsCounter.inc();
        }
        // end for all input splits
        // close the collector. if it is a chaining task collector, it will close its chained tasks
        this.output.close();
        // close all chained tasks letting them report failure
        BatchTask.closeChainedTasks(this.chainedTasks, this);
    } catch (Exception ex) {
        // close the input, but do not report any exceptions, since we already have another root cause
        try {
            this.format.close();
        } catch (Throwable ignored) {
        }
        BatchTask.cancelChainedTasks(this.chainedTasks);
        ex = ExceptionInChainedStubException.exceptionUnwrap(ex);
        if (ex instanceof CancelTaskException) {
            // forward canceling exception
            throw ex;
        } else if (!this.taskCanceled) {
            // drop exception, if the task was canceled
            BatchTask.logAndThrowException(ex, this);
        }
    } finally {
        BatchTask.clearWriters(eventualOutputs);
        // --------------------------------------------------------------------
        if (this.format != null && RichInputFormat.class.isAssignableFrom(this.format.getClass())) {
            ((RichInputFormat) this.format).closeInputFormat();
            LOG.debug(getLogString("Rich Source detected. Closing the InputFormat."));
        }
    }
    if (!this.taskCanceled) {
        LOG.debug(getLogString("Finished data source operator"));
    } else {
        LOG.debug(getLogString("Data source operator cancelled"));
    }
}

Example 9 with CancelTaskException

use of org.apache.flink.runtime.execution.CancelTaskException in project flink by apache.

the class Task method run.

/**
	 * The core work method that bootstraps the task and executes it code
	 */
@Override
public void run() {
    // ----------------------------
    while (true) {
        ExecutionState current = this.executionState;
        if (current == ExecutionState.CREATED) {
            if (transitionState(ExecutionState.CREATED, ExecutionState.DEPLOYING)) {
                // success, we can start our work
                break;
            }
        } else if (current == ExecutionState.FAILED) {
            // we were immediately failed. tell the TaskManager that we reached our final state
            notifyFinalState();
            return;
        } else if (current == ExecutionState.CANCELING) {
            if (transitionState(ExecutionState.CANCELING, ExecutionState.CANCELED)) {
                // we were immediately canceled. tell the TaskManager that we reached our final state
                notifyFinalState();
                return;
            }
        } else {
            throw new IllegalStateException("Invalid state for beginning of operation of task " + this + '.');
        }
    }
    // all resource acquisitions and registrations from here on
    // need to be undone in the end
    Map<String, Future<Path>> distributedCacheEntries = new HashMap<String, Future<Path>>();
    AbstractInvokable invokable = null;
    ClassLoader userCodeClassLoader;
    try {
        // ----------------------------
        //  Task Bootstrap - We periodically
        //  check for canceling as a shortcut
        // ----------------------------
        // activate safety net for task thread
        LOG.info("Creating FileSystem stream leak safety net for task {}", this);
        FileSystemSafetyNet.initializeSafetyNetForThread();
        // first of all, get a user-code classloader
        // this may involve downloading the job's JAR files and/or classes
        LOG.info("Loading JAR files for task {}.", this);
        userCodeClassLoader = createUserCodeClassloader(libraryCache);
        final ExecutionConfig executionConfig = serializedExecutionConfig.deserializeValue(userCodeClassLoader);
        if (executionConfig.getTaskCancellationInterval() >= 0) {
            // override task cancellation interval from Flink config if set in ExecutionConfig
            taskCancellationInterval = executionConfig.getTaskCancellationInterval();
        }
        if (executionConfig.getTaskCancellationTimeout() >= 0) {
            // override task cancellation timeout from Flink config if set in ExecutionConfig
            taskCancellationTimeout = executionConfig.getTaskCancellationTimeout();
        }
        // now load the task's invokable code
        invokable = loadAndInstantiateInvokable(userCodeClassLoader, nameOfInvokableClass);
        if (isCanceledOrFailed()) {
            throw new CancelTaskException();
        }
        // ----------------------------------------------------------------
        // register the task with the network stack
        // this operation may fail if the system does not have enough
        // memory to run the necessary data exchanges
        // the registration must also strictly be undone
        // ----------------------------------------------------------------
        LOG.info("Registering task at network: {}.", this);
        network.registerTask(this);
        // next, kick off the background copying of files for the distributed cache
        try {
            for (Map.Entry<String, DistributedCache.DistributedCacheEntry> entry : DistributedCache.readFileInfoFromConfig(jobConfiguration)) {
                LOG.info("Obtaining local cache file for '{}'.", entry.getKey());
                Future<Path> cp = fileCache.createTmpFile(entry.getKey(), entry.getValue(), jobId);
                distributedCacheEntries.put(entry.getKey(), cp);
            }
        } catch (Exception e) {
            throw new Exception(String.format("Exception while adding files to distributed cache of task %s (%s).", taskNameWithSubtask, executionId), e);
        }
        if (isCanceledOrFailed()) {
            throw new CancelTaskException();
        }
        // ----------------------------------------------------------------
        //  call the user code initialization methods
        // ----------------------------------------------------------------
        TaskKvStateRegistry kvStateRegistry = network.createKvStateTaskRegistry(jobId, getJobVertexId());
        Environment env = new RuntimeEnvironment(jobId, vertexId, executionId, executionConfig, taskInfo, jobConfiguration, taskConfiguration, userCodeClassLoader, memoryManager, ioManager, broadcastVariableManager, accumulatorRegistry, kvStateRegistry, inputSplitProvider, distributedCacheEntries, writers, inputGates, checkpointResponder, taskManagerConfig, metrics, this);
        // let the task code create its readers and writers
        invokable.setEnvironment(env);
        if (null != taskStateHandles) {
            if (invokable instanceof StatefulTask) {
                StatefulTask op = (StatefulTask) invokable;
                op.setInitialState(taskStateHandles);
            } else {
                throw new IllegalStateException("Found operator state for a non-stateful task invokable");
            }
            // be memory and GC friendly - since the code stays in invoke() for a potentially long time,
            // we clear the reference to the state handle
            //noinspection UnusedAssignment
            taskStateHandles = null;
        }
        // ----------------------------------------------------------------
        //  actual task core work
        // ----------------------------------------------------------------
        // we must make strictly sure that the invokable is accessible to the cancel() call
        // by the time we switched to running.
        this.invokable = invokable;
        // switch to the RUNNING state, if that fails, we have been canceled/failed in the meantime
        if (!transitionState(ExecutionState.DEPLOYING, ExecutionState.RUNNING)) {
            throw new CancelTaskException();
        }
        // notify everyone that we switched to running
        notifyObservers(ExecutionState.RUNNING, null);
        taskManagerActions.updateTaskExecutionState(new TaskExecutionState(jobId, executionId, ExecutionState.RUNNING));
        // make sure the user code classloader is accessible thread-locally
        executingThread.setContextClassLoader(userCodeClassLoader);
        // run the invokable
        invokable.invoke();
        // to the fact that it has been canceled
        if (isCanceledOrFailed()) {
            throw new CancelTaskException();
        }
        // finish the produced partitions. if this fails, we consider the execution failed.
        for (ResultPartition partition : producedPartitions) {
            if (partition != null) {
                partition.finish();
            }
        }
        // if that fails, the task was canceled/failed in the meantime
        if (transitionState(ExecutionState.RUNNING, ExecutionState.FINISHED)) {
            notifyObservers(ExecutionState.FINISHED, null);
        } else {
            throw new CancelTaskException();
        }
    } catch (Throwable t) {
        try {
            // check if the exception is unrecoverable
            if (ExceptionUtils.isJvmFatalError(t) || (t instanceof OutOfMemoryError && taskManagerConfig.shouldExitJvmOnOutOfMemoryError())) {
                // don't attempt a clean shutdown, because we cannot expect the clean shutdown to complete
                try {
                    LOG.error("Encountered fatal error {} - terminating the JVM", t.getClass().getName(), t);
                } finally {
                    Runtime.getRuntime().halt(-1);
                }
            }
            // to failExternally()
            while (true) {
                ExecutionState current = this.executionState;
                if (current == ExecutionState.RUNNING || current == ExecutionState.DEPLOYING) {
                    if (t instanceof CancelTaskException) {
                        if (transitionState(current, ExecutionState.CANCELED)) {
                            cancelInvokable();
                            notifyObservers(ExecutionState.CANCELED, null);
                            break;
                        }
                    } else {
                        if (transitionState(current, ExecutionState.FAILED, t)) {
                            // proper failure of the task. record the exception as the root cause
                            String errorMessage = String.format("Execution of %s (%s) failed.", taskNameWithSubtask, executionId);
                            failureCause = t;
                            cancelInvokable();
                            notifyObservers(ExecutionState.FAILED, new Exception(errorMessage, t));
                            break;
                        }
                    }
                } else if (current == ExecutionState.CANCELING) {
                    if (transitionState(current, ExecutionState.CANCELED)) {
                        notifyObservers(ExecutionState.CANCELED, null);
                        break;
                    }
                } else if (current == ExecutionState.FAILED) {
                    // in state failed already, no transition necessary any more
                    break;
                } else // unexpected state, go to failed
                if (transitionState(current, ExecutionState.FAILED, t)) {
                    LOG.error("Unexpected state in task {} ({}) during an exception: {}.", taskNameWithSubtask, executionId, current);
                    break;
                }
            // else fall through the loop and
            }
        } catch (Throwable tt) {
            String message = String.format("FATAL - exception in exception handler of task %s (%s).", taskNameWithSubtask, executionId);
            LOG.error(message, tt);
            notifyFatalError(message, tt);
        }
    } finally {
        try {
            LOG.info("Freeing task resources for {} ({}).", taskNameWithSubtask, executionId);
            // stop the async dispatcher.
            // copy dispatcher reference to stack, against concurrent release
            ExecutorService dispatcher = this.asyncCallDispatcher;
            if (dispatcher != null && !dispatcher.isShutdown()) {
                dispatcher.shutdownNow();
            }
            // free the network resources
            network.unregisterTask(this);
            // free memory resources
            if (invokable != null) {
                memoryManager.releaseAll(invokable);
            }
            // remove all of the tasks library resources
            libraryCache.unregisterTask(jobId, executionId);
            // remove all files in the distributed cache
            removeCachedFiles(distributedCacheEntries, fileCache);
            // close and de-activate safety net for task thread
            LOG.info("Ensuring all FileSystem streams are closed for task {}", this);
            FileSystemSafetyNet.closeSafetyNetAndGuardedResourcesForThread();
            notifyFinalState();
        } catch (Throwable t) {
            // an error in the resource cleanup is fatal
            String message = String.format("FATAL - exception in resource cleanup of task %s (%s).", taskNameWithSubtask, executionId);
            LOG.error(message, t);
            notifyFatalError(message, t);
        }
        // errors here will only be logged
        try {
            metrics.close();
        } catch (Throwable t) {
            LOG.error("Error during metrics de-registration of task {} ({}).", taskNameWithSubtask, executionId, t);
        }
    }
}

Example 10 with CancelTaskException

use of org.apache.flink.runtime.execution.CancelTaskException in project flink by apache.

the class PartitionRequestQueueTest method testProducerFailedException.

@Test
public void testProducerFailedException() throws Exception {
    PartitionRequestQueue queue = new PartitionRequestQueue();
    ResultPartitionProvider partitionProvider = mock(ResultPartitionProvider.class);
    ResultPartitionID rpid = new ResultPartitionID();
    BufferProvider bufferProvider = mock(BufferProvider.class);
    ResultSubpartitionView view = mock(ResultSubpartitionView.class);
    when(view.isReleased()).thenReturn(true);
    when(view.getFailureCause()).thenReturn(new RuntimeException("Expected test exception"));
    when(partitionProvider.createSubpartitionView(eq(rpid), eq(0), eq(bufferProvider), any(BufferAvailabilityListener.class))).thenReturn(view);
    EmbeddedChannel ch = new EmbeddedChannel(queue);
    SequenceNumberingViewReader seqView = new SequenceNumberingViewReader(new InputChannelID(), queue);
    seqView.requestSubpartitionView(partitionProvider, rpid, 0, bufferProvider);
    // Enqueue the erroneous view
    queue.notifyReaderNonEmpty(seqView);
    ch.runPendingTasks();
    // Read the enqueued msg
    Object msg = ch.readOutbound();
    assertEquals(msg.getClass(), NettyMessage.ErrorResponse.class);
    NettyMessage.ErrorResponse err = (NettyMessage.ErrorResponse) msg;
    assertTrue(err.cause instanceof CancelTaskException);
}