HADOOP-18168. . (#4140)

This moves off use of the purged s3a://landsat-pds bucket, so fixing tests
which had started failing.
* Adds a new class, PublicDatasetTestUtils to manage the use of public datasets.
* The new test bucket s3a://usgs-landsat/ is requester pays, so depends upon
  HADOOP-14661.

Consult the updated  test documentation when running against other S3 stores.

Contributed by Daniel Carl Jones

hadoop-tools/hadoop-aws/src/site/markdown/tools/hadoop-aws/testing.md

@@ -544,6 +544,18 @@ which address issues. In particular, we encourage testing of Hadoop release
 candidates, as these third-party endpoints get even less testing than the
 S3 endpoint itself.
 
+### Public datasets used in tests
+
+Some tests rely on the presence of existing public datasets available on Amazon S3.
+You may find a number of these in `org.apache.hadoop.fs.s3a.test.PublicDatasetTestUtils`.
+
+When testing against an endpoint which is not part of Amazon S3's standard commercial partition
+(`aws`) such as third-party implementations or AWS's China regions, you should replace these
+configurations with an empty space (` `) to disable the tests or an existing path in your object
+store that supports these tests.
+
+An example of this might be the MarkerTools tests which require a bucket with a large number of
+objects or the requester pays tests that require requester pays to be enabled for the bucket.
 
 ### Disabling the encryption tests
 

hadoop-tools/hadoop-aws/src/test/java/org/apache/hadoop/fs/s3a/ITestS3ARequesterPays.java

@@ -26,11 +26,11 @@ import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.fs.FSDataInputStream;
 import org.apache.hadoop.fs.FileSystem;
 import org.apache.hadoop.fs.Path;
+import org.apache.hadoop.fs.s3a.test.PublicDatasetTestUtils;
 import org.apache.hadoop.fs.statistics.IOStatisticAssertions;
 import org.apache.hadoop.fs.statistics.StreamStatisticNames;
 
 import static org.apache.hadoop.fs.s3a.Constants.ALLOW_REQUESTER_PAYS;
-import static org.apache.hadoop.fs.s3a.Constants.ENDPOINT;
 import static org.apache.hadoop.fs.s3a.Constants.S3A_BUCKET_PROBE;
 import static org.apache.hadoop.test.LambdaTestUtils.intercept;
 
@@ -42,10 +42,15 @@ public class ITestS3ARequesterPays extends AbstractS3ATestBase {
   @Override
   protected Configuration createConfiguration() {
     Configuration conf = super.createConfiguration();
-    S3ATestUtils.removeBaseAndBucketOverrides(conf,
+
+    Path requesterPaysPath = getRequesterPaysPath(conf);
+    String requesterPaysBucketName = requesterPaysPath.toUri().getHost();
+    S3ATestUtils.removeBaseAndBucketOverrides(
+        requesterPaysBucketName,
+        conf,
         ALLOW_REQUESTER_PAYS,
-        ENDPOINT,
         S3A_BUCKET_PROBE);
+
     return conf;
   }
 
@@ -102,14 +107,8 @@ public class ITestS3ARequesterPays extends AbstractS3ATestBase {
     }
   }
 
-  private Path getRequesterPaysPath(Configuration conf) {
-    String requesterPaysFile =
-        conf.getTrimmed(KEY_REQUESTER_PAYS_FILE, DEFAULT_REQUESTER_PAYS_FILE);
-    S3ATestUtils.assume(
-        "Empty test property: " + KEY_REQUESTER_PAYS_FILE,
-        !requesterPaysFile.isEmpty()
-    );
-    return new Path(requesterPaysFile);
+  private static Path getRequesterPaysPath(Configuration conf) {
+    return new Path(PublicDatasetTestUtils.getRequesterPaysObject(conf));
   }
 
 }

hadoop-tools/hadoop-aws/src/test/java/org/apache/hadoop/fs/s3a/S3ATestConstants.java

@@ -20,6 +20,9 @@ package org.apache.hadoop.fs.s3a;
 
 import java.time.Duration;
 
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.fs.s3a.test.PublicDatasetTestUtils;
+
 /**
  * Constants for S3A Testing.
  */
@@ -99,14 +102,19 @@ public interface S3ATestConstants {
 
   /**
    * Configuration key for an existing object in a requester pays bucket: {@value}.
-   * If not set, defaults to {@value DEFAULT_REQUESTER_PAYS_FILE}.
+   *
+   * Accessible via
+   * {@link PublicDatasetTestUtils#getRequesterPaysObject(Configuration)}.
    */
   String KEY_REQUESTER_PAYS_FILE = TEST_FS_S3A + "requester.pays.file";
 
   /**
-   * Default path for an S3 object inside a requester pays enabled bucket: {@value}.
+   * Configuration key for an existing bucket with many objects: {@value}.
+   *
+   * This is used for tests depending on buckets with a large number of keys.
    */
-  String DEFAULT_REQUESTER_PAYS_FILE = "s3a://usgs-landsat/collection02/catalog.json";
+  String KEY_BUCKET_WITH_MANY_OBJECTS
+      = TEST_FS_S3A + "bucket-with-many-objects";
 
   /**
    * Name of the property to define the timeout for scale tests: {@value}.

hadoop-tools/hadoop-aws/src/test/java/org/apache/hadoop/fs/s3a/test/PublicDatasetTestUtils.java

@@ -0,0 +1,101 @@
+/*
+ * 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.test;
+
+import org.apache.hadoop.classification.InterfaceAudience;
+import org.apache.hadoop.classification.InterfaceStability;
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.fs.s3a.S3ATestUtils;
+
+import static org.apache.hadoop.fs.s3a.S3ATestConstants.KEY_BUCKET_WITH_MANY_OBJECTS;
+import static org.apache.hadoop.fs.s3a.S3ATestConstants.KEY_REQUESTER_PAYS_FILE;
+
+/**
+ * Provides S3A filesystem URIs for public data sets for specific use cases.
+ *
+ * This allows for the contract between S3A tests and the existence of data sets
+ * to be explicit and also standardizes access and configuration of
+ * replacements.
+ *
+ * Bucket specific configuration such as endpoint or requester pays should be
+ * configured within "hadoop-tools/hadoop-aws/src/test/resources/core-site.xml".
+ *
+ * Warning: methods may mutate the configuration instance passed in.
+ */
+@InterfaceAudience.Private
+@InterfaceStability.Unstable
+public final class PublicDatasetTestUtils {
+
+  /**
+   * Private constructor for utility class.
+   */
+  private PublicDatasetTestUtils() {}
+
+  /**
+   * Default path for an object inside a requester pays bucket: {@value}.
+   */
+  private static final String DEFAULT_REQUESTER_PAYS_FILE
+      = "s3a://usgs-landsat/collection02/catalog.json";
+
+  /**
+   * Default bucket for an S3A file system with many objects: {@value}.
+   *
+   * We use a subdirectory to ensure we have permissions on all objects
+   * contained within as well as permission to inspect the directory itself.
+   */
+  private static final String DEFAULT_BUCKET_WITH_MANY_OBJECTS
+      = "s3a://usgs-landsat/collection02/level-1/";
+
+  /**
+   * Provide a URI for a directory containing many objects.
+   *
+   * Unless otherwise configured,
+   * this will be {@value DEFAULT_BUCKET_WITH_MANY_OBJECTS}.
+   *
+   * @param conf Hadoop configuration
+   * @return S3A FS URI
+   */
+  public static String getBucketPrefixWithManyObjects(Configuration conf) {
+    return fetchFromConfig(conf,
+        KEY_BUCKET_WITH_MANY_OBJECTS, DEFAULT_BUCKET_WITH_MANY_OBJECTS);
+  }
+
+  /**
+   * Provide a URI to an object within a requester pays enabled bucket.
+   *
+   * Unless otherwise configured,
+   * this will be {@value DEFAULT_REQUESTER_PAYS_FILE}.
+   *
+   * @param conf Hadoop configuration
+   * @return S3A FS URI
+   */
+  public static String getRequesterPaysObject(Configuration conf) {
+    return fetchFromConfig(conf,
+        KEY_REQUESTER_PAYS_FILE, DEFAULT_REQUESTER_PAYS_FILE);
+  }
+
+  private static String fetchFromConfig(Configuration conf, String key, String defaultValue) {
+    String value = conf.getTrimmed(key, defaultValue);
+
+    S3ATestUtils.assume("Empty test property: " + key, !value.isEmpty());
+
+    return value;
+  }
+
+}

hadoop-tools/hadoop-aws/src/test/java/org/apache/hadoop/fs/s3a/tools/ITestMarkerTool.java

@@ -28,9 +28,11 @@ import org.junit.Test;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
+import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.fs.FileSystem;
 import org.apache.hadoop.fs.Path;
 import org.apache.hadoop.fs.contract.ContractTestUtils;
+import org.apache.hadoop.fs.s3a.test.PublicDatasetTestUtils;
 import org.apache.hadoop.fs.s3a.S3AFileSystem;
 
 import static org.apache.hadoop.fs.s3a.Constants.DIRECTORY_MARKER_POLICY_AUTHORITATIVE;
@@ -307,22 +309,25 @@ public class ITestMarkerTool extends AbstractMarkerToolTest {
   }
 
   /**
-   * Run an audit against the landsat bucket.
+   * Run an audit against a bucket with a large number of objects.
    * <p></p>
    * This tests paging/scale against a larger bucket without
    * worrying about setup costs.
    */
   @Test
-  public void testRunLimitedLandsatAudit() throws Throwable {
-    describe("Audit a few thousand landsat objects");
+  public void testRunAuditManyObjectsInBucket() throws Throwable {
+    describe("Audit a few thousand objects");
     final File audit = tempAuditFile();
 
+    Configuration conf = super.createConfiguration();
+    String bucketUri = PublicDatasetTestUtils.getBucketPrefixWithManyObjects(conf);
+
     runToFailure(EXIT_INTERRUPTED,
         MARKERS,
         AUDIT,
         m(OPT_LIMIT), 3000,
         m(OPT_OUT), audit,
-        LANDSAT_BUCKET);
+        bucketUri);
     readOutput(audit);
   }
 

hadoop-tools/hadoop-aws/src/test/resources/core-site.xml

@@ -30,6 +30,8 @@
     <final>false</final>
   </property>
 
+  <!-- Per-bucket configurations: landsat-pds -->
+
   <property>
     <name>fs.s3a.bucket.landsat-pds.endpoint</name>
     <value>${central.endpoint}</value>
@@ -55,6 +57,31 @@
     <description>Do not add the referrer header to landsat operations</description>
   </property>
 
+  <!-- Per-bucket configurations: usgs-landsat -->
+
+  <property>
+    <name>fs.s3a.bucket.usgs-landsat.endpoint</name>
+    <value>${central.endpoint}</value>
+  </property>
+
+  <property>
+    <name>fs.s3a.bucket.usgs-landsat.requester.pays.enabled</name>
+    <value>true</value>
+    <description>usgs-landsat requires requester pays enabled</description>
+  </property>
+
+  <property>
+    <name>fs.s3a.bucket.usgs-landsat.multipart.purge</name>
+    <value>false</value>
+    <description>Don't try to purge uploads in the read-only bucket, as
+      it will only create log noise.</description>
+  </property>
+
+  <property>
+    <name>fs.s3a.bucket.usgs-landsat.audit.add.referrer.header</name>
+    <value>false</value>
+  </property>
+
 
   <!--
    This is the default endpoint, which can be used to interact