HDFS-12596. Add TestFsck#testFsckCorruptWhenOneReplicaIsCorrupt back to branch-2.7.

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestFsck.java

@@ -1471,4 +1471,41 @@ public class TestFsck {
       }
     }
   }
+
+  @Test(timeout = 300000)
+  public void testFsckCorruptWhenOneReplicaIsCorrupt()
+      throws Exception {
+    Configuration conf = new HdfsConfiguration();
+    final MiniDFSCluster cluster = new MiniDFSCluster.Builder(conf)
+        .nnTopology(MiniDFSNNTopology.simpleHATopology()).numDataNodes(2)
+        .build();
+    try {
+      cluster.waitActive();
+      FileSystem fs = HATestUtil.configureFailoverFs(cluster, conf);
+      cluster.transitionToActive(0);
+      String filePath = "/appendTest";
+      Path fileName = new Path(filePath);
+      DFSTestUtil.createFile(fs, fileName, 512, (short) 2, 0);
+      DFSTestUtil.waitReplication(fs, fileName, (short) 2);
+      assertTrue("File not created", fs.exists(fileName));
+      cluster.getDataNodes().get(1).shutdown();
+      DFSTestUtil.appendFile(fs, fileName, "appendCorruptBlock");
+      cluster.restartDataNode(1, true);
+      GenericTestUtils.waitFor(new Supplier<Boolean>() {
+        @Override
+        public Boolean get() {
+          return (
+              cluster.getNameNode(0).getNamesystem().getCorruptReplicaBlocks()
+                  > 0);
+        }
+      }, 100, 5000);
+
+      DFSTestUtil.appendFile(fs, fileName, "appendCorruptBlock");
+      runFsck(cluster.getConfiguration(0), 0, true, "/");
+    }finally {
+      if(cluster!=null){
+        cluster.shutdown();
+      }
+    }
+  }
 }