| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package org.apache.flink.test.checkpointing.utils; |
| |
| import org.apache.flink.api.common.functions.RuntimeContext; |
| import org.apache.flink.api.common.state.CheckpointListener; |
| import org.apache.flink.api.java.tuple.Tuple2; |
| import org.apache.flink.configuration.Configuration; |
| import org.apache.flink.streaming.api.checkpoint.ListCheckpointed; |
| import org.apache.flink.streaming.api.functions.source.RichSourceFunction; |
| |
| import javax.annotation.Nonnegative; |
| import javax.annotation.Nonnull; |
| |
| import java.io.Serializable; |
| import java.util.Collections; |
| import java.util.List; |
| import java.util.concurrent.atomic.AtomicLong; |
| |
| import static org.junit.Assert.assertEquals; |
| |
| /** Source for window checkpointing IT cases that can introduce artificial failures. */ |
| public class FailingSource extends RichSourceFunction<Tuple2<Long, IntType>> |
| implements ListCheckpointed<Integer>, CheckpointListener { |
| |
| /** Function to generate and emit the test events (and watermarks if required). */ |
| @FunctionalInterface |
| public interface EventEmittingGenerator extends Serializable { |
| void emitEvent(SourceContext<Tuple2<Long, IntType>> ctx, int eventSequenceNo); |
| } |
| |
| private static final long INITIAL = Long.MIN_VALUE; |
| private static final long STATEFUL_CHECKPOINT_COMPLETED = Long.MIN_VALUE; |
| |
| @Nonnull private final EventEmittingGenerator eventEmittingGenerator; |
| private final int expectedEmitCalls; |
| private final int failureAfterNumElements; |
| private final boolean usingProcessingTime; |
| private final AtomicLong checkpointStatus; |
| |
| private int emitCallCount; |
| private volatile boolean running; |
| |
| public FailingSource( |
| @Nonnull EventEmittingGenerator eventEmittingGenerator, |
| @Nonnegative int numberOfGeneratorInvocations) { |
| this(eventEmittingGenerator, numberOfGeneratorInvocations, false); |
| } |
| |
| public FailingSource( |
| @Nonnull EventEmittingGenerator eventEmittingGenerator, |
| @Nonnegative int numberOfGeneratorInvocations, |
| boolean usingProcessingTime) { |
| this.eventEmittingGenerator = eventEmittingGenerator; |
| this.running = true; |
| this.emitCallCount = 0; |
| this.expectedEmitCalls = numberOfGeneratorInvocations; |
| this.failureAfterNumElements = numberOfGeneratorInvocations / 2; |
| this.checkpointStatus = new AtomicLong(INITIAL); |
| this.usingProcessingTime = usingProcessingTime; |
| } |
| |
| @Override |
| public void open(Configuration parameters) { |
| // non-parallel source |
| assertEquals(1, getRuntimeContext().getNumberOfParallelSubtasks()); |
| } |
| |
| @Override |
| public void run(SourceContext<Tuple2<Long, IntType>> ctx) throws Exception { |
| |
| final RuntimeContext runtimeContext = getRuntimeContext(); |
| // detect if this task is "the chosen one" and should fail (via subtaskidx), if it did not |
| // fail before (via attempt) |
| final boolean failThisTask = |
| runtimeContext.getAttemptNumber() == 0 |
| && runtimeContext.getIndexOfThisSubtask() == 0; |
| |
| // we loop longer than we have elements, to permit delayed checkpoints |
| // to still cause a failure |
| while (running && emitCallCount < expectedEmitCalls) { |
| |
| // the function failed before, or we are in the elements before the failure |
| synchronized (ctx.getCheckpointLock()) { |
| eventEmittingGenerator.emitEvent(ctx, emitCallCount++); |
| } |
| |
| if (emitCallCount < failureAfterNumElements) { |
| Thread.sleep(1); |
| } else if (failThisTask && emitCallCount == failureAfterNumElements) { |
| // wait for a pending checkpoint that fulfills our requirements if needed |
| while (checkpointStatus.get() != STATEFUL_CHECKPOINT_COMPLETED) { |
| Thread.sleep(1); |
| } |
| throw new Exception("Artificial Failure"); |
| } |
| } |
| |
| if (usingProcessingTime) { |
| while (running) { |
| Thread.sleep(10); |
| } |
| } |
| } |
| |
| @Override |
| public void cancel() { |
| running = false; |
| } |
| |
| @Override |
| public void notifyCheckpointComplete(long checkpointId) { |
| // This will unblock the task for failing, if this is the checkpoint we are waiting for |
| checkpointStatus.compareAndSet(checkpointId, STATEFUL_CHECKPOINT_COMPLETED); |
| } |
| |
| @Override |
| public void notifyCheckpointAborted(long checkpointId) {} |
| |
| @Override |
| public List<Integer> snapshotState(long checkpointId, long timestamp) throws Exception { |
| // We accept a checkpoint as basis if it should have a "decent amount" of state |
| if (emitCallCount > failureAfterNumElements / 2) { |
| // This means we are waiting for notification of this checkpoint to completed now. |
| checkpointStatus.compareAndSet(INITIAL, checkpointId); |
| } |
| return Collections.singletonList(this.emitCallCount); |
| } |
| |
| @Override |
| public void restoreState(List<Integer> state) throws Exception { |
| if (state.isEmpty() || state.size() > 1) { |
| throw new RuntimeException( |
| "Test failed due to unexpected recovered state size " + state.size()); |
| } |
| this.emitCallCount = state.get(0); |
| } |
| } |