HADOOP-18085. S3 SDK Upgrade causes AccessPoint ARN endpoint mistranslation (apache#3902)

Part of HADOOP-17198. Support S3 Access Points.

HADOOP-18068. "upgrade AWS SDK to 1.12.132" broke the access point endpoint
translation.

Correct endpoints should start with "s3-accesspoint.", after SDK upgrade they start with
"s3.accesspoint-" which messes up tests + region detection by the SDK.

Contributed by Bogdan Stolojan

Author: bogthe

hadoop-tools/hadoop-aws/src/main/java/org/apache/hadoop/fs/s3a/ArnResource.java

@@ -21,12 +21,12 @@
 import javax.annotation.Nonnull;
 
 import com.amazonaws.arn.Arn;
-import com.amazonaws.regions.RegionUtils;
 
 /**
  * Represents an Arn Resource, this can be an accesspoint or bucket.
  */
 public final class ArnResource {
+  private final static String ACCESSPOINT_ENDPOINT_FORMAT = "s3-accesspoint.%s.amazonaws.com";
 
   /**
    * Resource name.
@@ -106,8 +106,7 @@ public String getFullArn() {
    * @return resource endpoint.
    */
   public String getEndpoint() {
-    return RegionUtils.getRegion(accessPointRegionKey)
-        .getServiceEndpoint("s3");
+    return String.format(ACCESSPOINT_ENDPOINT_FORMAT, region);
   }
 
   /**

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

@@ -39,39 +39,43 @@
 public class TestArnResource extends HadoopTestBase {
   private final static Logger LOG = LoggerFactory.getLogger(TestArnResource.class);
 
+  private final static String MOCK_ACCOUNT = "123456789101";
+
   @Test
   public void parseAccessPointFromArn() throws IllegalArgumentException {
     describe("Parse AccessPoint ArnResource from arn string");
 
     String accessPoint = "testAp";
-    String accountId = "123456789101";
     String[][] regionPartitionEndpoints = new String[][] {
-        {Regions.EU_WEST_1.getName(), "aws", "eu-west-1.amazonaws.com"},
-        {Regions.US_GOV_EAST_1.getName(), "aws-us-gov",
-            "us-gov-east-1.amazonaws.com"},
-        {Regions.CN_NORTH_1.getName(), "aws-cn", "cn-north-1.amazonaws.com"},
+        {Regions.EU_WEST_1.getName(), "aws"},
+        {Regions.US_GOV_EAST_1.getName(), "aws-us-gov"},
+        {Regions.CN_NORTH_1.getName(), "aws-cn"},
     };
 
     for (String[] testPair : regionPartitionEndpoints) {
       String region = testPair[0];
       String partition = testPair[1];
-      String endpoint = testPair[2];
-
-      // arn:partition:service:region:account-id:resource-type/resource-id
-      String arn = String.format("arn:%s:s3:%s:%s:accesspoint/%s", partition, region, accountId,
-          accessPoint);
 
-      ArnResource resource = ArnResource.accessPointFromArn(arn);
-      assertEquals("Arn does not match", arn, resource.getFullArn());
+      ArnResource resource = getArnResourceFrom(partition, region, MOCK_ACCOUNT, accessPoint);
       assertEquals("Access Point name does not match", accessPoint, resource.getName());
-      assertEquals("Account Id does not match", accountId, resource.getOwnerAccountId());
+      assertEquals("Account Id does not match", MOCK_ACCOUNT, resource.getOwnerAccountId());
       assertEquals("Region does not match", region, resource.getRegion());
-      Assertions.assertThat(resource.getEndpoint())
-          .describedAs("Endpoint does not match")
-          .contains(endpoint);
     }
   }
 
+  @Test
+  public void makeSureEndpointHasTheCorrectFormat() {
+    // Access point (AP) endpoints are different from S3 bucket endpoints, thus when using APs the
+    // endpoints for the client are modified. This test makes sure endpoint is set up correctly.
+    ArnResource accessPoint = getArnResourceFrom("aws", "eu-west-1", MOCK_ACCOUNT,
+        "test");
+    String expected = "s3-accesspoint.eu-west-1.amazonaws.com";
+
+    Assertions.assertThat(accessPoint.getEndpoint())
+        .describedAs("Endpoint has invalid format. Access Point requests will not work")
+        .isEqualTo(expected);
+  }
+
   @Test
   public void invalidARNsMustThrow() throws Exception {
     describe("Using an invalid ARN format must throw when initializing an ArnResource.");
@@ -80,6 +84,23 @@ public void invalidARNsMustThrow() throws Exception {
         ArnResource.accessPointFromArn("invalid:arn:resource"));
   }
 
+  /**
+   * Create an {@link ArnResource} from string components
+   * @param partition - partition for ARN
+   * @param region - region for ARN
+   * @param accountId - accountId for ARN
+   * @param resourceName - ARN resource name
+   * @return ArnResource described by its properties
+   */
+  private ArnResource getArnResourceFrom(String partition, String region, String accountId,
+      String resourceName) {
+    // arn:partition:service:region:account-id:resource-type/resource-id
+    String arn = String.format("arn:%s:s3:%s:%s:accesspoint/%s", partition, region, accountId,
+        resourceName);
+
+    return ArnResource.accessPointFromArn(arn);
+  }
+
   private void describe(String message) {
     LOG.info(message);
   }