-
Notifications
You must be signed in to change notification settings - Fork 1.1k
/
HandlingCorruptedInputRecordsIntegrationTest.java
140 lines (122 loc) · 5.9 KB
/
HandlingCorruptedInputRecordsIntegrationTest.java
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
/*
* Copyright Confluent Inc.
*
* Licensed 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 io.confluent.examples.streams;
import org.apache.kafka.common.errors.SerializationException;
import org.apache.kafka.common.serialization.ByteArraySerializer;
import org.apache.kafka.common.serialization.LongDeserializer;
import org.apache.kafka.common.serialization.LongSerializer;
import org.apache.kafka.common.serialization.Serde;
import org.apache.kafka.common.serialization.Serdes;
import org.apache.kafka.common.serialization.StringSerializer;
import org.apache.kafka.streams.KeyValue;
import org.apache.kafka.streams.StreamsBuilder;
import org.apache.kafka.streams.StreamsConfig;
import org.apache.kafka.streams.TestInputTopic;
import org.apache.kafka.streams.TestOutputTopic;
import org.apache.kafka.streams.TopologyTestDriver;
import org.apache.kafka.streams.kstream.KStream;
import org.apache.kafka.streams.kstream.Produced;
import org.junit.Test;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import java.util.Properties;
import java.util.stream.Collectors;
import static org.hamcrest.CoreMatchers.equalTo;
import static org.hamcrest.MatcherAssert.assertThat;
/**
* End-to-end integration test that demonstrates how to handle corrupt input records (think: poison
* pill messages) in a Kafka topic, which would normally lead to application failures due to
* (de)serialization exceptions.
* <p>
* In this example we choose to ignore/skip corrupted input records. We describe further options at
* http://docs.confluent.io/current/streams/faq.html, e.g. sending corrupted records to a quarantine
* topic (think: dead letter queue).
* <p>
* Note: This example uses lambda expressions and thus works with Java 8+ only.
*/
public class HandlingCorruptedInputRecordsIntegrationTest {
@Test
public void shouldIgnoreCorruptInputRecords() {
//
// Step 1: Configure and start the processor topology.
//
final StreamsBuilder builder = new StreamsBuilder();
final Properties streamsConfiguration = new Properties();
streamsConfiguration.put(StreamsConfig.APPLICATION_ID_CONFIG, "failure-handling-integration-test");
streamsConfiguration.put(StreamsConfig.BOOTSTRAP_SERVERS_CONFIG, "dummy config");
streamsConfiguration.put(StreamsConfig.DEFAULT_KEY_SERDE_CLASS_CONFIG, Serdes.ByteArray().getClass().getName());
streamsConfiguration.put(StreamsConfig.DEFAULT_VALUE_SERDE_CLASS_CONFIG, Serdes.ByteArray().getClass().getName());
final Serde<String> stringSerde = Serdes.String();
final Serde<Long> longSerde = Serdes.Long();
final String inputTopic = "inputTopic";
final String outputTopic = "outputTopic";
final KStream<byte[], byte[]> stream = builder.stream(inputTopic);
// Note how the returned stream is of type `KStream<String, Long>`.
final KStream<String, Long> doubled = stream.flatMap(
(k, v) -> {
try {
// Attempt deserialization
final String key = stringSerde.deserializer().deserialize("input-topic", k);
final long value = longSerde.deserializer().deserialize("input-topic", v);
// Ok, the record is valid (not corrupted). Let's take the
// opportunity to also process the record in some way so that
// we haven't paid the deserialization cost just for "poison pill"
// checking.
return Collections.singletonList(KeyValue.pair(key, 2 * value));
} catch (final SerializationException e) {
// Ignore/skip the corrupted record by catching the exception.
// Optionally, we can log the fact that we did so:
System.err.println("Could not deserialize record: " + e.getMessage());
}
return Collections.emptyList();
}
);
// Write the processing results (which was generated from valid records only) to Kafka.
doubled.to(outputTopic, Produced.with(stringSerde, longSerde));
final List<Long> inputValues = Arrays.asList(1L, 2L, 3L);
final LongSerializer longSerializer = new LongSerializer();
final List<byte[]> serializedInputValues =
inputValues.stream().map(x -> longSerializer.serialize(inputTopic, x)).collect(Collectors.toList());
final List<Long> expectedValues = inputValues.stream().map(x -> 2 * x).collect(Collectors.toList());
try (final TopologyTestDriver topologyTestDriver = new TopologyTestDriver(builder.build(), streamsConfiguration)) {
//
// Step 2: Setup input and output topics.
//
// setup input topic as byte[]-value type to allow ingesting corrupted data
final TestInputTopic<Void, byte[]> input = topologyTestDriver
.createInputTopic(inputTopic,
new IntegrationTestUtils.NothingSerde<>(),
new ByteArraySerializer());
final TestOutputTopic<Void, Long> output = topologyTestDriver
.createOutputTopic(outputTopic,
new IntegrationTestUtils.NothingSerde<>(),
new LongDeserializer());
//
// Step 3: Produce some corrupt input data to the input topic.
//
input.pipeInput(new StringSerializer().serialize(inputTopic, "corrupt"));
//
// Step 4: Produce some (valid) input data to the input topic.
//
input.pipeValueList(serializedInputValues);
//
// Step 5: Verify the application's output data.
//
assertThat(output.readValuesToList(), equalTo(expectedValues));
}
}
}