Github user aljoscha commented on a diff in the pull request:
https://github.com/apache/flink/pull/3778#discussion_r114345125
--- Diff:
flink-connectors/flink-connector-kafka-base/src/test/java/org/apache/flink/streaming/connectors/kafka/FlinkKafkaConsumerBaseFrom12MigrationTest.java
---
@@ -0,0 +1,491 @@
+/*
+ * 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.streaming.connectors.kafka;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNull;
+import static org.junit.Assert.assertTrue;
+import static org.mockito.Matchers.anyMapOf;
+import static org.mockito.Mockito.doAnswer;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.when;
+
+import java.io.Serializable;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import org.apache.flink.core.testutils.OneShotLatch;
+import org.apache.flink.streaming.api.TimeCharacteristic;
+import
org.apache.flink.streaming.api.functions.AssignerWithPeriodicWatermarks;
+import
org.apache.flink.streaming.api.functions.AssignerWithPunctuatedWatermarks;
+import org.apache.flink.streaming.api.functions.source.SourceFunction;
+import org.apache.flink.streaming.api.operators.StreamSource;
+import org.apache.flink.streaming.api.operators.StreamingRuntimeContext;
+import org.apache.flink.streaming.api.watermark.Watermark;
+import
org.apache.flink.streaming.connectors.kafka.internals.AbstractFetcher;
+import
org.apache.flink.streaming.connectors.kafka.internals.KafkaTopicPartition;
+import org.apache.flink.streaming.runtime.tasks.OperatorStateHandles;
+import org.apache.flink.streaming.util.AbstractStreamOperatorTestHarness;
+import org.apache.flink.streaming.util.OperatorSnapshotUtil;
+import
org.apache.flink.streaming.util.serialization.KeyedDeserializationSchema;
+import org.apache.flink.util.SerializedValue;
+import org.junit.Assert;
+import org.junit.Ignore;
+import org.junit.Test;
+import org.mockito.invocation.InvocationOnMock;
+import org.mockito.stubbing.Answer;
+
+/**
+ * Tests for checking whether {@link FlinkKafkaConsumerBase} can restore
from snapshots that were
+ * done using the Flink 1.2 {@link FlinkKafkaConsumerBase}.
+ *
+ * <p>For regenerating the binary snapshot files run {@link
#writeSnapshot()} on the Flink 1.2
+ * branch.
+ */
+public class FlinkKafkaConsumerBaseFrom12MigrationTest {
+
+
+ /**
+ * Manually run this to write binary snapshot data.
+ */
+ @Ignore
+ @Test
+ public void writeSnapshot() throws Exception {
+ final HashMap<KafkaTopicPartition, Long> state = new
HashMap<>();
+ state.put(new KafkaTopicPartition("abc", 13), 16768L);
+ state.put(new KafkaTopicPartition("def", 7), 987654321L);
+
writeSnapshot("src/test/resources/kafka-consumer-migration-test-flink1.2-snapshot",
state);
+
+ final HashMap<KafkaTopicPartition, Long> emptyState = new
HashMap<>();
+
writeSnapshot("src/test/resources/kafka-consumer-migration-test-flink1.2-snapshot-empty-state",
emptyState);
+ }
+
+ private void writeSnapshot(String path, HashMap<KafkaTopicPartition,
Long> state) throws Exception {
+
+ final OneShotLatch latch = new OneShotLatch();
+ final AbstractFetcher<String, ?> fetcher =
mock(AbstractFetcher.class);
+
+ doAnswer(new Answer<Void>() {
+ @Override
+ public Void answer(InvocationOnMock invocation) throws
Throwable {
+ latch.trigger();
+ return null;
+ }
+ }).when(fetcher).runFetchLoop();
+
+ when(fetcher.snapshotCurrentState()).thenReturn(state);
+
+ final List<KafkaTopicPartition> partitions = new ArrayList<>();
+ partitions.add(new KafkaTopicPartition("abc", 13));
+ partitions.add(new KafkaTopicPartition("def", 7));
+
+ final DummyFlinkKafkaConsumer<String> consumerFunction = new
DummyFlinkKafkaConsumer<>(
+ new FetcherFactory<String>() {
+ private static final long
serialVersionUID = -2803131905656983619L;
+
+ @Override
+ public AbstractFetcher<String, ?>
createFetcher() {
+ return fetcher;
+ }
+ },
+ partitions);
+
+ StreamSource<String, DummyFlinkKafkaConsumer<String>>
consumerOperator =
+ new StreamSource<>(consumerFunction);
+
+
+ final AbstractStreamOperatorTestHarness<String> testHarness =
+ new
AbstractStreamOperatorTestHarness<>(consumerOperator, 1, 1, 0);
+
+
testHarness.setTimeCharacteristic(TimeCharacteristic.ProcessingTime);
+
+ testHarness.setup();
+ testHarness.open();
+
+ final Throwable[] error = new Throwable[1];
+
+ // run the source asynchronously
+ Thread runner = new Thread() {
+ @Override
+ public void run() {
+ try {
+ consumerFunction.run(new
DummySourceContext() {
+ @Override
+ public void collect(String
element) {
+ latch.trigger();
+ }
+ });
+ }
+ catch (Throwable t) {
+ t.printStackTrace();
+ error[0] = t;
+ }
+ }
+ };
+ runner.start();
+
+ if (!latch.isTriggered()) {
+ latch.await();
+ }
+
+ final OperatorStateHandles snapshot;
+ synchronized (testHarness.getCheckpointLock()) {
+ snapshot = testHarness.snapshot(0L, 0L);
+ }
+
+ OperatorSnapshotUtil.writeStateHandle(snapshot, path);
+
+ consumerOperator.close();
+ runner.join();
+ }
+
+ @Test
+ public void testRestoreWithEmptyStateNoPartitions() throws Exception {
+ //
--------------------------------------------------------------------
+ // prepare fake states
+ //
--------------------------------------------------------------------
+
+ final OneShotLatch latch = new OneShotLatch();
+ final AbstractFetcher<String, ?> fetcher =
mock(AbstractFetcher.class);
+
+ doAnswer(new Answer() {
+ @Override
+ public Object answer(InvocationOnMock invocationOnMock)
throws Throwable {
+ latch.trigger();
+ Assert.fail("This should never be called");
+ return null;
+ }
+
}).when(fetcher).restoreOffsets(anyMapOf(KafkaTopicPartition.class,
Long.class));
+
+ doAnswer(new Answer<Void>() {
+ @Override
+ public Void answer(InvocationOnMock invocation) throws
Throwable {
+ latch.trigger();
+ Assert.fail("This should never be called");
+ return null;
+ }
+ }).when(fetcher).runFetchLoop();
+
+ final DummyFlinkKafkaConsumer<String> consumerFunction = new
DummyFlinkKafkaConsumer<>(
+ new FetcherFactory<String>() {
+ private static final long
serialVersionUID = -2803131905656983619L;
+
+ @Override
+ public AbstractFetcher<String, ?>
createFetcher() {
+ return fetcher;
+ }
+ },
+ Collections.<KafkaTopicPartition>emptyList());
+
+ StreamSource<String, DummyFlinkKafkaConsumer<String>>
consumerOperator =
+ new StreamSource<>(consumerFunction);
+
+ final AbstractStreamOperatorTestHarness<String> testHarness =
+ new
AbstractStreamOperatorTestHarness<>(consumerOperator, 1, 1, 0);
+
+
testHarness.setTimeCharacteristic(TimeCharacteristic.ProcessingTime);
+
+ testHarness.setup();
+ testHarness.initializeState(
+ OperatorSnapshotUtil.readStateHandle(
+
OperatorSnapshotUtil.getResourceFilename("kafka-consumer-migration-test-flink1.2-snapshot-empty-state")));
+ testHarness.open();
+
+ final Throwable[] error = new Throwable[1];
+
+ // run the source asynchronously
+ Thread runner = new Thread() {
+ @Override
+ public void run() {
+ try {
+ consumerFunction.run(new
DummySourceContext() {
+ @Override
+ public void collect(String
element) {
+ latch.trigger();
+ Assert.fail("This
should never be called.");
+ }
+
+ @Override
+ public void
emitWatermark(Watermark mark) {
+ latch.trigger();
+
assertEquals(Long.MAX_VALUE, mark.getTimestamp());
+ }
+ });
+ }
+ catch (Throwable t) {
+ t.printStackTrace();
+ error[0] = t;
+ }
+ }
+ };
+ runner.start();
+
+ if (!latch.isTriggered()) {
+ latch.await();
+ }
+
+ consumerOperator.cancel();
+ consumerOperator.close();
+
+ runner.interrupt();
+ runner.join();
+
+ assertNull(error[0]);
--- End diff --
Changing to
```
assertNull("Got error: " + error[0], error[0]);
```
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