anuragmantri commented on code in PR #14161: URL: https://github.com/apache/iceberg/pull/14161#discussion_r2441460642
########## aws/src/test/java/org/apache/iceberg/aws/TestS3FileIOSharedResourceManagement.java: ########## @@ -0,0 +1,249 @@ +/* + * 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.iceberg.aws; + +import static org.assertj.core.api.Assertions.assertThat; +import static org.assertj.core.api.Assertions.assertThatCode; + +import java.io.ByteArrayInputStream; +import java.io.ByteArrayOutputStream; +import java.io.ObjectInputStream; +import java.io.ObjectOutputStream; +import java.util.Map; +import java.util.concurrent.CountDownLatch; +import java.util.concurrent.ExecutorService; +import java.util.concurrent.Executors; +import java.util.concurrent.TimeUnit; +import java.util.concurrent.atomic.AtomicInteger; +import java.util.concurrent.atomic.AtomicReference; +import org.apache.iceberg.aws.s3.S3FileIO; +import org.apache.iceberg.relocated.com.google.common.collect.Maps; +import org.junit.jupiter.api.BeforeEach; +import org.junit.jupiter.api.Test; + +public class TestS3FileIOSharedResourceManagement { + + private Map<String, String> properties; + + @BeforeEach + public void before() { + properties = Maps.newHashMap(); + properties.put("client.region", "us-east-1"); + properties.put("s3.endpoint", "https://localhost:9000";); + properties.put("s3.path-style-access", "true"); + properties.put("s3.delete.enabled", "false"); // Don't actually delete during tests + } + + @Test + public void testMultipleS3FileIOInstancesShareResources() { + // Create multiple S3FileIO instances with same configuration + S3FileIO fileIO1 = new S3FileIO(); + fileIO1.initialize(properties); + + S3FileIO fileIO2 = new S3FileIO(); + fileIO2.initialize(properties); + + S3FileIO fileIO3 = new S3FileIO(); + fileIO3.initialize(properties); + + // Verify they can coexist without resource conflicts + assertThat(fileIO1.client()).isNotNull(); + assertThat(fileIO2.client()).isNotNull(); + assertThat(fileIO3.client()).isNotNull(); + + // Close some instances - others should continue working + fileIO1.close(); + fileIO2.close(); + + // The remaining instance should still work + assertThatCode(() -> fileIO3.client()).doesNotThrowAnyException(); + + fileIO3.close(); + } + + @Test + public void testSerializationDeserialization() throws Exception { + // This test simulates Spark's broadcast variable serialization/deserialization + S3FileIO originalFileIO = new S3FileIO(); + originalFileIO.initialize(properties); + + // Serialize the S3FileIO + ByteArrayOutputStream baos = new ByteArrayOutputStream(); + try (ObjectOutputStream oos = new ObjectOutputStream(baos)) { + oos.writeObject(originalFileIO); + } + + // Deserialize on "executor" + ByteArrayInputStream bais = new ByteArrayInputStream(baos.toByteArray()); + S3FileIO deserializedFileIO; + try (ObjectInputStream ois = new ObjectInputStream(bais)) { + deserializedFileIO = (S3FileIO) ois.readObject(); + } + + // Both should work without conflicts + assertThat(originalFileIO.client()).isNotNull(); + assertThat(deserializedFileIO.client()).isNotNull(); + + // Close original (simulating broadcast cleanup) - deserialized should still work + originalFileIO.close(); + assertThatCode(deserializedFileIO::client).doesNotThrowAnyException(); + + deserializedFileIO.close(); + } + + @Test + public void testConcurrentAccessFromMultipleThreads() throws InterruptedException { + int threadCount = 10; + ExecutorService executor = Executors.newFixedThreadPool(threadCount); + CountDownLatch startLatch = new CountDownLatch(1); + CountDownLatch completionLatch = new CountDownLatch(threadCount); + AtomicInteger successCount = new AtomicInteger(0); + AtomicReference<Exception> firstException = new AtomicReference<>(); + + // Create multiple threads that each create and use S3FileIO instances + for (int i = 0; i < threadCount; i++) { + executor.submit( + () -> { + try { + startLatch.await(); // Wait for all threads to be ready + + S3FileIO fileIO = new S3FileIO(); + fileIO.initialize(properties); + + // Simulate some operations + assertThat(fileIO.client()).isNotNull(); + + // Simulate random close timing (like Spark GC cleanup) + if (Math.random() > 0.5) { + Thread.sleep((long) (Math.random() * 100)); + } + + fileIO.close(); + successCount.incrementAndGet(); + + } catch (Exception e) { + firstException.compareAndSet(null, e); + } finally { + completionLatch.countDown(); + } + }); + } + + // Start all threads simultaneously + startLatch.countDown(); + + // Wait for completion + assertThat(completionLatch.await(30, TimeUnit.SECONDS)).isTrue(); + + // Verify no exceptions occurred + if (firstException.get() != null) { + throw new RuntimeException("Test failed with exception", firstException.get()); + } + + assertThat(successCount.get()).isEqualTo(threadCount); + + executor.shutdown(); + assertThat(executor.awaitTermination(5, TimeUnit.SECONDS)).isTrue(); + } + + @Test + public void testMemoryPressureSimulation() throws InterruptedException { Review Comment: Agreed, I removed this in the new revision since I don't depend on Cleaner interface anymore. -- This is an automated message from the Apache Git Service. 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