wcarlson5 commented on a change in pull request #9615: URL: https://github.com/apache/kafka/pull/9615#discussion_r529709595
########## File path: streams/src/test/java/org/apache/kafka/streams/integration/AdjustStreamThreadCountTest.java ########## @@ -0,0 +1,115 @@ +/* + * 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.kafka.streams.integration; + +import org.apache.kafka.common.serialization.Serdes; +import org.apache.kafka.common.serialization.StringSerializer; +import org.apache.kafka.streams.KafkaStreams; +import org.apache.kafka.streams.KeyValue; +import org.apache.kafka.streams.StreamsBuilder; +import org.apache.kafka.streams.StreamsConfig; +import org.apache.kafka.streams.integration.utils.EmbeddedKafkaCluster; +import org.apache.kafka.streams.integration.utils.IntegrationTestUtils; +import org.apache.kafka.test.IntegrationTest; +import org.apache.kafka.test.StreamsTestUtils; +import org.apache.kafka.test.TestUtils; +import org.junit.After; +import org.junit.Before; +import org.junit.ClassRule; +import org.junit.Rule; +import org.junit.Test; +import org.junit.experimental.categories.Category; +import org.junit.rules.TestName; + +import java.io.IOException; +import java.util.Collections; +import java.util.Properties; + +import static org.apache.kafka.common.utils.Utils.mkEntry; +import static org.apache.kafka.common.utils.Utils.mkMap; +import static org.apache.kafka.common.utils.Utils.mkObjectProperties; +import static org.apache.kafka.streams.integration.utils.IntegrationTestUtils.purgeLocalStreamsState; +import static org.apache.kafka.streams.integration.utils.IntegrationTestUtils.safeUniqueTestName; +import static org.hamcrest.CoreMatchers.equalTo; +import static org.hamcrest.MatcherAssert.assertThat; + +@Category(IntegrationTest.class) +public class AdjustStreamThreadCountTest { + + @ClassRule + public static final EmbeddedKafkaCluster CLUSTER = new EmbeddedKafkaCluster(1); + + @Rule + public TestName testName = new TestName(); + + private static String inputTopic; + private static StreamsBuilder builder; + private static Properties properties; + private static String appId = ""; + + @Before + public void setup() { + final String testId = safeUniqueTestName(getClass(), testName); + appId = "appId_" + testId; + inputTopic = "input" + testId; + IntegrationTestUtils.cleanStateBeforeTest(CLUSTER, inputTopic); + + builder = new StreamsBuilder(); + builder.stream(inputTopic); + + properties = mkObjectProperties( + mkMap( + mkEntry(StreamsConfig.BOOTSTRAP_SERVERS_CONFIG, CLUSTER.bootstrapServers()), + mkEntry(StreamsConfig.APPLICATION_ID_CONFIG, appId), + mkEntry(StreamsConfig.STATE_DIR_CONFIG, TestUtils.tempDirectory().getPath()), + mkEntry(StreamsConfig.NUM_STREAM_THREADS_CONFIG, 2), + mkEntry(StreamsConfig.DEFAULT_KEY_SERDE_CLASS_CONFIG, Serdes.StringSerde.class), + mkEntry(StreamsConfig.DEFAULT_VALUE_SERDE_CLASS_CONFIG, Serdes.StringSerde.class) + ) + ); + } + + @After + public void teardown() throws IOException { + purgeLocalStreamsState(properties); + } + + private void produceMessages(final long timestamp, final String streamOneInput, final String msg) { + IntegrationTestUtils.produceKeyValuesSynchronouslyWithTimestamp( + streamOneInput, + Collections.singletonList(new KeyValue<>("1", msg)), + TestUtils.producerConfig( + CLUSTER.bootstrapServers(), + StringSerializer.class, + StringSerializer.class, + new Properties()), + timestamp); + } + + @Test + public void shouldAddStreamThread() throws Exception { + try (final KafkaStreams kafkaStreams = new KafkaStreams(builder.build(), properties)) { + StreamsTestUtils.startKafkaStreamsAndWaitForRunningState(kafkaStreams); + final int oldThreadCount = kafkaStreams.localThreadsMetadata().size(); + + kafkaStreams.addStreamThread(); + produceMessages(0L, inputTopic, "A"); Review comment: no, we don't ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: us...@infra.apache.org
