org.apache.flink.streaming.connectors.kafka.KafkaConsumerTest.java Source code

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/*
 * 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 org.apache.commons.collections.map.LinkedMap;

import org.apache.flink.streaming.connectors.kafka.internals.KafkaTopicPartition;
import org.apache.flink.streaming.util.serialization.SimpleStringSchema;
import org.apache.kafka.clients.consumer.ConsumerConfig;
import org.junit.Ignore;
import org.junit.Test;

import java.lang.reflect.Field;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import java.util.Properties;

import static org.junit.Assert.*;
import static org.mockito.Mockito.*;

public class KafkaConsumerTest {

    @Test
    public void testValidateZooKeeperConfig() {
        try {
            // empty
            Properties emptyProperties = new Properties();
            try {
                FlinkKafkaConsumer08.validateZooKeeperConfig(emptyProperties);
                fail("should fail with an exception");
            } catch (IllegalArgumentException e) {
                // expected
            }

            // no connect string (only group string)
            Properties noConnect = new Properties();
            noConnect.put(ConsumerConfig.GROUP_ID_CONFIG, "flink-test-group");
            try {
                FlinkKafkaConsumer08.validateZooKeeperConfig(noConnect);
                fail("should fail with an exception");
            } catch (IllegalArgumentException e) {
                // expected
            }

            // no group string (only connect string)
            Properties noGroup = new Properties();
            noGroup.put("zookeeper.connect", "localhost:47574");
            try {
                FlinkKafkaConsumer08.validateZooKeeperConfig(noGroup);
                fail("should fail with an exception");
            } catch (IllegalArgumentException e) {
                // expected
            }
        } catch (Exception e) {
            e.printStackTrace();
            fail(e.getMessage());
        }
    }

    @Test
    public void testSnapshot() {
        try {
            Field offsetsField = FlinkKafkaConsumerBase.class.getDeclaredField("offsetsState");
            Field runningField = FlinkKafkaConsumerBase.class.getDeclaredField("running");
            Field mapField = FlinkKafkaConsumerBase.class.getDeclaredField("pendingCheckpoints");

            offsetsField.setAccessible(true);
            runningField.setAccessible(true);
            mapField.setAccessible(true);

            FlinkKafkaConsumer08<?> consumer = mock(FlinkKafkaConsumer08.class);
            when(consumer.snapshotState(anyLong(), anyLong())).thenCallRealMethod();

            HashMap<KafkaTopicPartition, Long> testOffsets = new HashMap<>();
            long[] offsets = new long[] { 43, 6146, 133, 16, 162, 616 };
            int j = 0;
            for (long i : offsets) {
                KafkaTopicPartition ktp = new KafkaTopicPartition("topic", j++);
                testOffsets.put(ktp, i);
            }

            LinkedMap map = new LinkedMap();

            offsetsField.set(consumer, testOffsets);
            runningField.set(consumer, true);
            mapField.set(consumer, map);

            assertTrue(map.isEmpty());

            // make multiple checkpoints
            for (long checkpointId = 10L; checkpointId <= 2000L; checkpointId += 9L) {
                HashMap<KafkaTopicPartition, Long> checkpoint = consumer.snapshotState(checkpointId,
                        47 * checkpointId);
                assertEquals(testOffsets, checkpoint);

                // change the offsets, make sure the snapshot did not change
                HashMap<KafkaTopicPartition, Long> checkpointCopy = (HashMap<KafkaTopicPartition, Long>) checkpoint
                        .clone();

                for (Map.Entry<KafkaTopicPartition, Long> e : testOffsets.entrySet()) {
                    testOffsets.put(e.getKey(), e.getValue() + 1);
                }

                assertEquals(checkpointCopy, checkpoint);

                assertTrue(map.size() > 0);
                assertTrue(map.size() <= FlinkKafkaConsumer08.MAX_NUM_PENDING_CHECKPOINTS);
            }
        } catch (Exception e) {
            e.printStackTrace();
            fail(e.getMessage());
        }
    }

    @Test
    @Ignore("Kafka consumer internally makes an infinite loop")
    public void testCreateSourceWithoutCluster() {
        try {
            Properties props = new Properties();
            props.setProperty("zookeeper.connect", "localhost:56794");
            props.setProperty("bootstrap.servers", "localhost:11111, localhost:22222");
            props.setProperty("group.id", "non-existent-group");

            new FlinkKafkaConsumer08<>(Collections.singletonList("no op topic"), new SimpleStringSchema(), props);
        } catch (Exception e) {
            e.printStackTrace();
            fail(e.getMessage());
        }
    }
}