steveloughran commented on a change in pull request #1838: HADOOP-16711 Add way 
to skip verifyBuckets check in S3A fs init()
URL: https://github.com/apache/hadoop/pull/1838#discussion_r378419167
 
 

 ##########
 File path: 
hadoop-tools/hadoop-aws/src/test/java/org/apache/hadoop/fs/s3a/ITestS3ABucketExistence.java
 ##########
 @@ -0,0 +1,119 @@
+/*
+ * 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.FileNotFoundException;
+import java.io.IOException;
+import java.net.URI;
+import java.util.UUID;
+
+import org.junit.After;
+import org.junit.Test;
+
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.fs.FileSystem;
+import org.apache.hadoop.fs.Path;
+import org.apache.hadoop.io.IOUtils;
+
+import static org.apache.hadoop.fs.contract.ContractTestUtils.dataset;
+import static org.apache.hadoop.fs.contract.ContractTestUtils.writeDataset;
+import static org.apache.hadoop.fs.s3a.Constants.FS_S3A;
+import static org.apache.hadoop.fs.s3a.Constants.S3A_BUCKET_PROBE;
+import static org.apache.hadoop.test.LambdaTestUtils.intercept;
+
+/**
+ * Class to test bucket existence api.
+ * See {@link S3AFileSystem#doBucketProbing()}.
+ */
+public class ITestS3ABucketExistence extends AbstractS3ATestBase {
+
+  private FileSystem fs;
+
+  private final String randomBucket =
+          "random-bucket-" + UUID.randomUUID().toString();
+
+  private final URI uri = URI.create(FS_S3A + "://" + randomBucket);
+
+  @Test
+  public void testNoBucketProbing() throws Exception {
+    Configuration configuration = getConfiguration();
+    configuration.setInt(S3A_BUCKET_PROBE, 0);
+    try {
+      fs = FileSystem.get(uri, configuration);
+    } catch (IOException ex) {
+      LOG.error("Exception : ", ex);
+      throw ex;
+    }
+
+    Path path = new Path(uri);
+    intercept(FileNotFoundException.class,
+            "No such file or directory: " + path,
+        () -> fs.getFileStatus(path));
+
+    Path src = new Path(fs.getUri() + "/testfile");
+    byte[] data = dataset(1024, 'a', 'z');
+    intercept(FileNotFoundException.class,
+            "The specified bucket does not exist",
+        () -> writeDataset(fs, src, data, data.length, 1024 * 1024, true));
+  }
+
+  @Test
+  public void testBucketProbingV1() throws Exception {
+    Configuration configuration = getConfiguration();
+    configuration.setInt(S3A_BUCKET_PROBE, 1);
+    intercept(FileNotFoundException.class,
+        () -> FileSystem.get(uri, configuration));
+  }
+
+  @Test
+  public void testBucketProbingV2() throws Exception {
+    Configuration configuration = getConfiguration();
+    configuration.setInt(S3A_BUCKET_PROBE, 2);
+    intercept(FileNotFoundException.class,
+        () -> FileSystem.get(uri, configuration));
+  }
+
+  @Test
+  public void testBucketProbingParameterValidation() throws Exception {
+    Configuration configuration = getConfiguration();
+    configuration.setInt(S3A_BUCKET_PROBE, 3);
+    intercept(IllegalArgumentException.class,
+            "Value of " + S3A_BUCKET_PROBE + " should be between 0 to 2",
+            "Should throw IllegalArgumentException",
+        () -> FileSystem.get(uri, configuration));
+    configuration.setInt(S3A_BUCKET_PROBE, -1);
+    intercept(IllegalArgumentException.class,
+            "Value of " + S3A_BUCKET_PROBE + " should be between 0 to 2",
+            "Should throw IllegalArgumentException",
+        () -> FileSystem.get(uri, configuration));
+  }
+
+  @Override
+  protected Configuration getConfiguration() {
+    Configuration configuration = super.getConfiguration();
+    S3ATestUtils.disableFilesystemCaching(configuration);
+    return configuration;
+  }
+
+  @After
+  public void tearDown() throws Exception {
+    IOUtils.cleanupWithLogger(getLogger(), fs);
 
 Review comment:
   no worries

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