HDFS-15510. RBF: Quota and Content Summary was not correct in Multiple Destinations. Contributed by Hemanth Boyina.

(cherry picked from commit ca8e7a7725)

hadoop-hdfs-project/hadoop-hdfs-rbf/src/main/java/org/apache/hadoop/hdfs/server/federation/router/RouterClientProtocol.java

@@ -1857,6 +1857,8 @@ private RemoteLocation getFirstMatchingLocation(RemoteLocation location,
 
   /**
    * Aggregate content summaries for each subcluster.
+   * If the mount point has multiple destinations
+   * add the quota set value only once.
    *
    * @param summaries Collection of individual summaries.
    * @return Aggregated content summary.
@@ -1879,9 +1881,9 @@ private ContentSummary aggregateContentSummary(
       length += summary.getLength();
       fileCount += summary.getFileCount();
       directoryCount += summary.getDirectoryCount();
-      quota += summary.getQuota();
+      quota = summary.getQuota();
       spaceConsumed += summary.getSpaceConsumed();
-      spaceQuota += summary.getSpaceQuota();
+      spaceQuota = summary.getSpaceQuota();
       // We return from the first response as we assume that the EC policy
       // of each sub-cluster is same.
       if (ecPolicy.isEmpty()) {

hadoop-hdfs-project/hadoop-hdfs-rbf/src/test/java/org/apache/hadoop/hdfs/server/federation/router/TestRouterRPCMultipleDestinationMountTableResolver.java

@@ -550,6 +550,63 @@ public void testClearQuota() throws Exception {
     assertEquals(-1, cs1.getSpaceQuota());
   }
 
+  @Test
+  public void testContentSummaryWithMultipleDest() throws Exception {
+    MountTable addEntry;
+    long nsQuota = 5;
+    long ssQuota = 100;
+    Path path = new Path("/testContentSummaryWithMultipleDest");
+    Map<String, String> destMap = new HashMap<>();
+    destMap.put("ns0", "/testContentSummaryWithMultipleDest");
+    destMap.put("ns1", "/testContentSummaryWithMultipleDest");
+    nnFs0.mkdirs(path);
+    nnFs1.mkdirs(path);
+    addEntry =
+        MountTable.newInstance("/testContentSummaryWithMultipleDest", destMap);
+    addEntry.setQuota(
+        new RouterQuotaUsage.Builder().quota(nsQuota).spaceQuota(ssQuota)
+            .build());
+    assertTrue(addMountTable(addEntry));
+    RouterQuotaUpdateService updateService =
+        routerContext.getRouter().getQuotaCacheUpdateService();
+    updateService.periodicInvoke();
+    ContentSummary cs = routerFs.getContentSummary(path);
+    assertEquals(nsQuota, cs.getQuota());
+    assertEquals(ssQuota, cs.getSpaceQuota());
+    ContentSummary ns0Cs = nnFs0.getContentSummary(path);
+    assertEquals(nsQuota, ns0Cs.getQuota());
+    assertEquals(ssQuota, ns0Cs.getSpaceQuota());
+    ContentSummary ns1Cs = nnFs1.getContentSummary(path);
+    assertEquals(nsQuota, ns1Cs.getQuota());
+    assertEquals(ssQuota, ns1Cs.getSpaceQuota());
+  }
+
+  @Test
+  public void testContentSummaryMultipleDestWithMaxValue()
+      throws Exception {
+    MountTable addEntry;
+    long nsQuota = Long.MAX_VALUE - 2;
+    long ssQuota = Long.MAX_VALUE - 2;
+    Path path = new Path("/testContentSummaryMultipleDestWithMaxValue");
+    Map<String, String> destMap = new HashMap<>();
+    destMap.put("ns0", "/testContentSummaryMultipleDestWithMaxValue");
+    destMap.put("ns1", "/testContentSummaryMultipleDestWithMaxValue");
+    nnFs0.mkdirs(path);
+    nnFs1.mkdirs(path);
+    addEntry = MountTable
+        .newInstance("/testContentSummaryMultipleDestWithMaxValue", destMap);
+    addEntry.setQuota(
+        new RouterQuotaUsage.Builder().quota(nsQuota).spaceQuota(ssQuota)
+            .build());
+    assertTrue(addMountTable(addEntry));
+    RouterQuotaUpdateService updateService =
+        routerContext.getRouter().getQuotaCacheUpdateService();
+    updateService.periodicInvoke();
+    ContentSummary cs = routerFs.getContentSummary(path);
+    assertEquals(nsQuota, cs.getQuota());
+    assertEquals(ssQuota, cs.getSpaceQuota());
+  }
+
   /**
    * Test to verify rename operation on directories in case of multiple
    * destinations.