HDFS-16540 Data locality is lost when DataNode pod restarts in kubernetes (#4170)

When DN with the same UUID is registered with a different IP, host2DatanodeMap needs to be updated accordingly.

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/DatanodeManager.java

@@ -1171,6 +1171,7 @@ public class DatanodeManager {
         nodeN = null;
       }
   
+      boolean updateHost2DatanodeMap = false;
       if (nodeS != null) {
         if (nodeN == nodeS) {
           // The same datanode has been just restarted to serve the same data 
@@ -1189,7 +1190,11 @@ public class DatanodeManager {
             nodes with its data cleared (or user can just remove the StorageID
             value in "VERSION" file under the data directory of the datanode,
             but this is might not work if VERSION file format has changed 
-         */        
+         */
+          // Check if nodeS's host information is same as nodeReg's, if not,
+          // it needs to update host2DatanodeMap accordringly.
+          updateHost2DatanodeMap = !nodeS.getXferAddr().equals(nodeReg.getXferAddr());
+
           NameNode.stateChangeLog.info("BLOCK* registerDatanode: " + nodeS
               + " is replaced by " + nodeReg + " with the same storageID "
               + nodeReg.getDatanodeUuid());
@@ -1199,6 +1204,11 @@ public class DatanodeManager {
         try {
           // update cluster map
           getNetworkTopology().remove(nodeS);
+
+          // Update Host2DatanodeMap
+          if (updateHost2DatanodeMap) {
+            getHost2DatanodeMap().remove(nodeS);
+          }
           if(shouldCountVersion(nodeS)) {
             decrementVersionCount(nodeS.getSoftwareVersion());
           }
@@ -1217,6 +1227,11 @@ public class DatanodeManager {
             nodeS.setDependentHostNames(
                 getNetworkDependenciesWithDefault(nodeS));
           }
+
+          if (updateHost2DatanodeMap) {
+            getHost2DatanodeMap().add(nodeS);
+          }
+
           getNetworkTopology().add(nodeS);
           resolveUpgradeDomain(nodeS);
 

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/blockmanagement/TestDatanodeManager.java

@@ -138,6 +138,35 @@ public class TestDatanodeManager {
         mapToCheck.get("version1").intValue(), 1);
   }
 
+  /**
+   * This test checks that if a node is re-registered with a different ip, its
+   * host2DatanodeMap is correctly updated with the new ip.
+   */
+  @Test
+  public void testHost2NodeMapCorrectAfterReregister()
+          throws IOException, InterruptedException {
+    //Create the DatanodeManager which will be tested
+    FSNamesystem fsn = Mockito.mock(FSNamesystem.class);
+    Mockito.when(fsn.hasWriteLock()).thenReturn(true);
+    Configuration conf = new Configuration();
+    DatanodeManager dm = mockDatanodeManager(fsn, conf);
+
+    String storageID = "someStorageID1";
+    String ipOld = "someIPOld" + storageID;
+    String ipNew = "someIPNew" + storageID;
+
+    dm.registerDatanode(new DatanodeRegistration(
+            new DatanodeID(ipOld, "", storageID, 9000, 0, 0, 0),
+            null, null, "version"));
+
+    dm.registerDatanode(new DatanodeRegistration(
+            new DatanodeID(ipNew, "", storageID, 9000, 0, 0, 0),
+            null, null, "version"));
+
+    assertNull("should be no node with old ip", dm.getDatanodeByHost(ipOld));
+    assertNotNull("should be a node with new ip", dm.getDatanodeByHost(ipNew));
+  }
+
   /**
    * This test sends a random sequence of node registrations and node removals
    * to the DatanodeManager (of nodes with different IDs and versions), and