Yunyung commented on code in PR #20110: URL: https://github.com/apache/kafka/pull/20110#discussion_r2194370254
########## storage/src/test/java/org/apache/kafka/storage/internals/log/LogConcurrencyTest.java: ########## @@ -0,0 +1,204 @@ +/* + * 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.storage.internals.log; + +import org.apache.kafka.common.compress.Compression; +import org.apache.kafka.common.record.MemoryRecords; +import org.apache.kafka.common.record.RecordBatch; +import org.apache.kafka.common.record.SimpleRecord; +import org.apache.kafka.common.utils.Time; +import org.apache.kafka.common.utils.Utils; +import org.apache.kafka.coordinator.transaction.TransactionLogConfig; +import org.apache.kafka.server.storage.log.FetchIsolation; +import org.apache.kafka.server.util.KafkaScheduler; +import org.apache.kafka.storage.log.metrics.BrokerTopicStats; +import org.apache.kafka.test.TestUtils; + +import org.junit.jupiter.api.AfterEach; +import org.junit.jupiter.api.BeforeEach; +import org.junit.jupiter.api.Test; + +import java.io.File; +import java.io.IOException; +import java.util.ArrayList; +import java.util.Iterator; +import java.util.List; +import java.util.Map; +import java.util.Optional; +import java.util.Properties; +import java.util.concurrent.CompletableFuture; +import java.util.function.Supplier; +import java.util.stream.IntStream; + +import static org.junit.jupiter.api.Assertions.assertDoesNotThrow; +import static org.junit.jupiter.api.Assertions.assertEquals; + + + +public class LogConcurrencyTest { + private final BrokerTopicStats brokerTopicStats = new BrokerTopicStats(); + private final KafkaScheduler scheduler = new KafkaScheduler(1); + private final File tmpDir = TestUtils.tempDirectory(); + private final File logDir = TestUtils.randomPartitionLogDir(tmpDir); + private UnifiedLog log; + + @BeforeEach + public void setup() { + scheduler.startup(); + } + + @AfterEach + public void teardown() throws Exception { + scheduler.shutdown(); + if (log != null) { + log.close(); + } + Utils.delete(tmpDir); + } + + @Test + public void testUncommittedDataNotConsumed() throws Exception { + testUncommittedDataNotConsumed(createLog()); + } + + @Test + public void testUncommittedDataNotConsumedFrequentSegmentRolls() throws Exception { + final Properties logProps = new Properties(); + logProps.put(LogConfig.INTERNAL_SEGMENT_BYTES_CONFIG, 237); + final LogConfig logConfig = new LogConfig(logProps); + testUncommittedDataNotConsumed(createLog(logConfig)); + } + + private void testUncommittedDataNotConsumed(UnifiedLog log) throws Exception { + var maxOffset = 5000; + var consumerFuture = CompletableFuture.supplyAsync(consumerTask(log, maxOffset)); + var fetcherTaskFuture = CompletableFuture.runAsync(logAppendTask(log, maxOffset)); + + fetcherTaskFuture.join(); + validateConsumedData(log, consumerFuture.join()); + } + + /** + * Simple consumption task which reads the log in ascending order and collects + * consumed batches for validation + */ + private Supplier<List<FetchedBatch>> consumerTask(UnifiedLog log, int lastOffset) { + return () -> assertDoesNotThrow(() -> { + final List<FetchedBatch> consumedBatches = new ArrayList<>(); + long fetchOffset = 0L; + while (log.highWatermark() < lastOffset) { + final FetchDataInfo readInfo = log.read(fetchOffset, 1, FetchIsolation.HIGH_WATERMARK, true); + for (RecordBatch batch : readInfo.records.batches()) { + consumedBatches.add(new FetchedBatch(batch.baseOffset(), batch.partitionLeaderEpoch())); + fetchOffset = batch.lastOffset() + 1; + } + } + return consumedBatches; + }); + } + + /** + * This class simulates basic leader/follower behavior. + */ + private Runnable logAppendTask(UnifiedLog log, int lastOffset) { + return () -> assertDoesNotThrow(() -> { + int leaderEpoch = 1; + boolean isLeader = true; + while (log.highWatermark() < lastOffset) { + switch (TestUtils.RANDOM.nextInt(2)) { + case 0 -> { + final LogOffsetMetadata logEndOffsetMetadata = log.logEndOffsetMetadata(); + final long logEndOffset = logEndOffsetMetadata.messageOffset; + final int batchSize = TestUtils.RANDOM.nextInt(9) + 1; + final SimpleRecord[] records = IntStream.rangeClosed(0, batchSize) + .mapToObj(i -> new SimpleRecord(String.valueOf(i).getBytes())) + .toArray(SimpleRecord[]::new); + + if (isLeader) { + log.appendAsLeader(MemoryRecords.withRecords(Compression.NONE, records), leaderEpoch); + log.maybeIncrementHighWatermark(logEndOffsetMetadata); + } else { + log.appendAsFollower( + MemoryRecords.withRecords( + logEndOffset, + Compression.NONE, + leaderEpoch, + records + ), + Integer.MAX_VALUE + ); + log.updateHighWatermark(logEndOffset); + } + } + case 1 -> { + isLeader = !isLeader; + leaderEpoch += 1; + + if (!isLeader) { + log.truncateTo(log.highWatermark()); + } + } + } + } + }); + } + + private UnifiedLog createLog() throws IOException { + return createLog(new LogConfig(Map.of())); + } + + private UnifiedLog createLog(LogConfig config) throws IOException { + log = UnifiedLog.create( + logDir, + config, + 0L, + 0L, + scheduler, + brokerTopicStats, + Time.SYSTEM, + 5 * 60 * 1000, + new ProducerStateManagerConfig(TransactionLogConfig.PRODUCER_ID_EXPIRATION_MS_DEFAULT, false), + TransactionLogConfig.PRODUCER_ID_EXPIRATION_CHECK_INTERVAL_MS_DEFAULT, + new LogDirFailureChannel(10), + true, + Optional.empty() + ); + + return log; + } + + private void validateConsumedData(UnifiedLog log, List<FetchedBatch> consumedBatches) { + final Iterator<FetchedBatch> iter = consumedBatches.iterator(); + log.logSegments().forEach(segment -> + segment.log().batches().forEach(batch -> { + if (iter.hasNext()) { + final FetchedBatch consumedBatch = iter.next(); + assertEquals(batch.partitionLeaderEpoch(), + consumedBatch.epoch(), + "Consumed batch " + consumedBatch + " does not match next expected batch in log " + batch); + assertEquals(batch.baseOffset(), + consumedBatch.baseOffset(), + "Consumed batch " + consumedBatch + " does not match next expected batch in log " + batch); + } + }) + ); + } + + private record FetchedBatch(long baseOffset, int epoch) { Review Comment: Sure. 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