abmo-x commented on code in PR #9998:
URL: https://github.com/apache/iceberg/pull/9998#discussion_r1540155731


##########
core/src/test/java/org/apache/hadoop/fs/s3a/S3ABlockOutputStream.java:
##########
@@ -0,0 +1,67 @@
+/*
+ * 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.hadoop.fs.s3a;
+
+import java.io.IOException;
+import java.io.OutputStream;
+import java.util.concurrent.CancellationException;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+import java.util.concurrent.Future;
+
+/** mock class for testing hadoop s3a writer */
+public class S3ABlockOutputStream extends OutputStream {
+  public ExecutorService mockCloseService;
+  public Future<?> mockUploadOnClose;
+
+  public S3ABlockOutputStream() {
+    mockCloseService = Executors.newSingleThreadExecutor();
+  }
+
+  @Override
+  public void write(int b) throws IOException {
+    throw new IOException("mocked class, do not use");
+  }
+
+  @Override
+  public void close() throws IOException {
+    try {
+      mockUploadOnClose =
+          mockCloseService.submit(
+              () -> {
+                try {
+                  Thread.sleep(30 * 1000);

Review Comment:
   removed assert for duration. 
   
   Looked into awaitlity, I don't think we need it here as awaitility provides 
utils to make test wait for results and assert with a timeout. We are not doing 
that here anymore.
   
   



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