HDFS-17396. BootstrapStandby should download rollback image during RollingUpgrade

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

@@ -26,6 +26,7 @@
 import org.apache.hadoop.hdfs.protocol.HdfsConstants.DatanodeReportType;
 import org.apache.hadoop.hdfs.security.token.block.ExportedBlockKeys;
 import org.apache.hadoop.hdfs.server.namenode.CheckpointSignature;
+import org.apache.hadoop.hdfs.server.namenode.NNStorage;
 import org.apache.hadoop.hdfs.server.namenode.NameNode.OperationCategory;
 import org.apache.hadoop.hdfs.server.protocol.BlocksWithLocations;
 import org.apache.hadoop.hdfs.server.protocol.DatanodeStorageReport;
@@ -114,6 +115,17 @@ public long getMostRecentCheckpointTxId() throws IOException {
     return rpcServer.invokeAtAvailableNs(method, long.class);
   }
 
+  @Override
+  public long getMostRecentNameNodeFileTxId(NNStorage.NameNodeFile nnf)
+      throws IOException {
+    rpcServer.checkOperation(OperationCategory.READ);
+
+    RemoteMethod method =
+        new RemoteMethod(NamenodeProtocol.class, "getMostRecentNameNodeFileTxId",
+            new Class<?>[] {NNStorage.NameNodeFile.class}, nnf);
+    return rpcServer.invokeAtAvailableNs(method, long.class);
+  }
+
   @Override
   public CheckpointSignature rollEditLog() throws IOException {
     rpcServer.checkOperation(OperationCategory.WRITE, false);

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

@@ -145,6 +145,7 @@
 import org.apache.hadoop.hdfs.server.namenode.CheckpointSignature;
 import org.apache.hadoop.hdfs.server.namenode.LeaseExpiredException;
 import org.apache.hadoop.hdfs.server.namenode.NameNode.OperationCategory;
+import org.apache.hadoop.hdfs.server.namenode.NNStorage;
 import org.apache.hadoop.hdfs.server.namenode.NotReplicatedYetException;
 import org.apache.hadoop.hdfs.server.namenode.SafeModeException;
 import org.apache.hadoop.hdfs.server.protocol.BlocksWithLocations;
@@ -1640,6 +1641,12 @@ public long getMostRecentCheckpointTxId() throws IOException {
     return nnProto.getMostRecentCheckpointTxId();
   }
 
+  @Override // NamenodeProtocol
+  public long getMostRecentNameNodeFileTxId(NNStorage.NameNodeFile nnf)
+      throws IOException {
+    return nnProto.getMostRecentNameNodeFileTxId(nnf);
+  }
+
   @Override // NamenodeProtocol
   public CheckpointSignature rollEditLog() throws IOException {
     return nnProto.rollEditLog();

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/protocolPB/NamenodeProtocolServerSideTranslatorPB.java

@@ -35,6 +35,8 @@
 import org.apache.hadoop.hdfs.protocol.proto.NamenodeProtocolProtos.GetEditLogManifestResponseProto;
 import org.apache.hadoop.hdfs.protocol.proto.NamenodeProtocolProtos.GetMostRecentCheckpointTxIdRequestProto;
 import org.apache.hadoop.hdfs.protocol.proto.NamenodeProtocolProtos.GetMostRecentCheckpointTxIdResponseProto;
+import org.apache.hadoop.hdfs.protocol.proto.NamenodeProtocolProtos.GetMostRecentNameNodeFileTxIdRequestProto;
+import org.apache.hadoop.hdfs.protocol.proto.NamenodeProtocolProtos.GetMostRecentNameNodeFileTxIdResponseProto;
 import org.apache.hadoop.hdfs.protocol.proto.NamenodeProtocolProtos.GetNextSPSPathRequestProto;
 import org.apache.hadoop.hdfs.protocol.proto.NamenodeProtocolProtos.GetNextSPSPathResponseProto;
 import org.apache.hadoop.hdfs.protocol.proto.NamenodeProtocolProtos.GetTransactionIdRequestProto;
@@ -51,6 +53,7 @@
 import org.apache.hadoop.hdfs.protocol.proto.NamenodeProtocolProtos.StartCheckpointResponseProto;
 import org.apache.hadoop.hdfs.security.token.block.ExportedBlockKeys;
 import org.apache.hadoop.hdfs.server.namenode.CheckpointSignature;
+import org.apache.hadoop.hdfs.server.namenode.NNStorage;
 import org.apache.hadoop.hdfs.server.protocol.BlocksWithLocations;
 import org.apache.hadoop.hdfs.server.protocol.NamenodeCommand;
 import org.apache.hadoop.hdfs.server.protocol.NamenodeProtocol;
@@ -141,6 +144,20 @@ public GetMostRecentCheckpointTxIdResponseProto getMostRecentCheckpointTxId(
     return GetMostRecentCheckpointTxIdResponseProto.newBuilder().setTxId(txid).build();
   }
 
+  @Override
+  public GetMostRecentNameNodeFileTxIdResponseProto getMostRecentNameNodeFileTxId(
+      RpcController unused, GetMostRecentNameNodeFileTxIdRequestProto request)
+      throws ServiceException {
+    long txid;
+    try {
+      txid = impl.getMostRecentNameNodeFileTxId(
+          NNStorage.NameNodeFile.valueOf(request.getNameNodeFile()));
+    } catch (IOException e) {
+      throw new ServiceException(e);
+    }
+    return GetMostRecentNameNodeFileTxIdResponseProto.newBuilder().setTxId(txid).build();
+  }
+
 
   @Override
   public RollEditLogResponseProto rollEditLog(RpcController unused,

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/protocolPB/NamenodeProtocolTranslatorPB.java

@@ -34,6 +34,7 @@
 import org.apache.hadoop.hdfs.protocol.proto.NamenodeProtocolProtos.GetBlocksRequestProto;
 import org.apache.hadoop.hdfs.protocol.proto.NamenodeProtocolProtos.GetEditLogManifestRequestProto;
 import org.apache.hadoop.hdfs.protocol.proto.NamenodeProtocolProtos.GetMostRecentCheckpointTxIdRequestProto;
+import org.apache.hadoop.hdfs.protocol.proto.NamenodeProtocolProtos.GetMostRecentNameNodeFileTxIdRequestProto;
 import org.apache.hadoop.hdfs.protocol.proto.NamenodeProtocolProtos.GetNextSPSPathRequestProto;
 import org.apache.hadoop.hdfs.protocol.proto.NamenodeProtocolProtos.GetNextSPSPathResponseProto;
 import org.apache.hadoop.hdfs.protocol.proto.NamenodeProtocolProtos.GetTransactionIdRequestProto;
@@ -46,6 +47,7 @@
 import org.apache.hadoop.hdfs.protocol.proto.NamenodeProtocolProtos.StartCheckpointRequestProto;
 import org.apache.hadoop.hdfs.security.token.block.ExportedBlockKeys;
 import org.apache.hadoop.hdfs.server.namenode.CheckpointSignature;
+import org.apache.hadoop.hdfs.server.namenode.NNStorage;
 import org.apache.hadoop.hdfs.server.protocol.BlocksWithLocations;
 import org.apache.hadoop.hdfs.server.protocol.NamenodeCommand;
 import org.apache.hadoop.hdfs.server.protocol.NamenodeProtocol;
@@ -134,6 +136,17 @@ public long getMostRecentCheckpointTxId() throws IOException {
         GetMostRecentCheckpointTxIdRequestProto.getDefaultInstance()).getTxId());
   }
 
+  @Override
+  public long getMostRecentNameNodeFileTxId(NNStorage.NameNodeFile nnf) throws IOException {
+    try {
+      return rpcProxy.getMostRecentNameNodeFileTxId(NULL_CONTROLLER,
+          GetMostRecentNameNodeFileTxIdRequestProto.newBuilder()
+              .setNameNodeFile(nnf.toString()).build()).getTxId();
+    } catch (ServiceException e) {
+      throw ProtobufHelper.getRemoteException(e);
+    }
+  }
+
   @Override
   public CheckpointSignature rollEditLog() throws IOException {
     return PBHelper.convert(ipc(() -> rpcProxy.rollEditLog(NULL_CONTROLLER,

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSImage.java

@@ -1562,4 +1562,25 @@ public void updateLastAppliedTxIdFromWritten() {
   public long getMostRecentCheckpointTxId() {
     return storage.getMostRecentCheckpointTxId();
   }
+
+  /**
+   * @return the latest txid for the NameNodeFile type, or
+   * {@link HdfsServerConstants::INVALID_TXID}if there is no FSImage file of the
+   * type requested.
+   */
+  public long getMostRecentNameNodeFileTxId(NameNodeFile nnf) throws IOException {
+    final FSImageStorageInspector inspector =
+        new FSImageTransactionalStorageInspector(EnumSet.of(nnf));
+    storage.inspectStorageDirs(inspector);
+    try {
+      List<FSImageFile> images = inspector.getLatestImages();
+      if (images != null && !images.isEmpty()) {
+        return images.get(0).getCheckpointTxId();
+      } else {
+        return HdfsServerConstants.INVALID_TXID;
+      }
+    } catch (FileNotFoundException e) {
+      return HdfsServerConstants.INVALID_TXID;
+    }
+  }
 }

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/NameNodeRpcServer.java

@@ -1361,6 +1361,14 @@ public long getMostRecentCheckpointTxId() throws IOException {
     namesystem.checkSuperuserPrivilege(operationName);
     return namesystem.getFSImage().getMostRecentCheckpointTxId();
   }
+
+  @Override // NamenodeProtocol
+  public long getMostRecentNameNodeFileTxId(NNStorage.NameNodeFile nnf) throws IOException {
+    checkNNStartup();
+    namesystem.checkOperation(OperationCategory.UNCHECKED);
+    namesystem.checkSuperuserPrivilege();
+    return namesystem.getFSImage().getMostRecentNameNodeFileTxId(nnf);
+  }
 
   @Override // NamenodeProtocol
   public CheckpointSignature rollEditLog() throws IOException {

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/ha/BootstrapStandby.java

@@ -248,7 +248,7 @@ private int doRun() throws IOException {
     }
 
     // download the fsimage from active namenode
-    int download = downloadImage(storage, proxy, proxyInfo);
+    int download = downloadImage(storage, proxy, proxyInfo, isRollingUpgrade);
     if (download != 0) {
       return download;
     }
@@ -351,12 +351,32 @@ private void doUpgrade(NNStorage storage) throws IOException {
     }
   }
 
-  private int downloadImage(NNStorage storage, NamenodeProtocol proxy, RemoteNameNodeInfo proxyInfo)
+  private int downloadImage(NNStorage storage, NamenodeProtocol proxy, RemoteNameNodeInfo proxyInfo,
+        boolean isRollingUpgrade)
       throws IOException {
     // Load the newly formatted image, using all of the directories
     // (including shared edits)
     final long imageTxId = proxy.getMostRecentCheckpointTxId();
     final long curTxId = proxy.getTransactionID();
+
+    if (isRollingUpgrade) {
+      final long rollbackTxId =
+          proxy.getMostRecentNameNodeFileTxId(NameNodeFile.IMAGE_ROLLBACK);
+      assert rollbackTxId != HdfsServerConstants.INVALID_TXID :
+          "Expected a valid TXID for fsimage_rollback file";
+      FSImage rollbackImage = new FSImage(conf);
+      try {
+        rollbackImage.getStorage().setStorageInfo(storage);
+        MD5Hash hash = TransferFsImage.downloadImageToStorage(
+            proxyInfo.getHttpAddress(), rollbackTxId, storage, true, true);
+        rollbackImage.saveDigestAndRenameCheckpointImage(
+            NameNodeFile.IMAGE_ROLLBACK, rollbackTxId, hash);
+      } catch (IOException ioe) {
+        throw ioe;
+      } finally {
+        rollbackImage.close();
+      }
+    }
     FSImage image = new FSImage(conf);
     try {
       image.getStorage().setStorageInfo(storage);

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/protocol/NamenodeProtocol.java

@@ -26,6 +26,7 @@
 import org.apache.hadoop.hdfs.protocol.DatanodeInfo;
 import org.apache.hadoop.hdfs.security.token.block.ExportedBlockKeys;
 import org.apache.hadoop.hdfs.server.namenode.CheckpointSignature;
+import org.apache.hadoop.hdfs.server.namenode.NNStorage;
 import org.apache.hadoop.hdfs.server.namenode.ha.ReadOnly;
 import org.apache.hadoop.io.retry.AtMostOnce;
 import org.apache.hadoop.io.retry.Idempotent;
@@ -111,6 +112,12 @@ BlocksWithLocations getBlocks(DatanodeInfo datanode, long size, long
   @Idempotent
   public long getMostRecentCheckpointTxId() throws IOException;
 
+  /**
+   * Get the transaction ID of the most recent checkpoint for the given NameNodeFile.
+   */
+  @Idempotent
+  public long getMostRecentNameNodeFileTxId(NNStorage.NameNodeFile nnf) throws IOException;
+
   /**
    * Closes the current edit log and opens a new one. The 
    * call fails if the file system is in SafeMode.

hadoop-hdfs-project/hadoop-hdfs/src/main/proto/NamenodeProtocol.proto

@@ -108,6 +108,14 @@ message GetMostRecentCheckpointTxIdResponseProto{
   required uint64 txId = 1;
 }
 
+message GetMostRecentNameNodeFileTxIdRequestProto {
+  required string nameNodeFile = 1;
+}
+
+message GetMostRecentNameNodeFileTxIdResponseProto{
+  required uint64 txId = 1;
+}
+
 /**
  * registration - Namenode reporting the error
  * errorCode - error code indicating the error
@@ -253,6 +261,12 @@ service NamenodeProtocolService {
   rpc getMostRecentCheckpointTxId(GetMostRecentCheckpointTxIdRequestProto) 
       returns(GetMostRecentCheckpointTxIdResponseProto);
 
+  /**
+   * Get the transaction ID of the NameNodeFile
+   */
+  rpc getMostRecentNameNodeFileTxId(GetMostRecentNameNodeFileTxIdRequestProto)
+      returns(GetMostRecentNameNodeFileTxIdResponseProto);
+
   /**
    * Close the current editlog and open a new one for checkpointing purposes
    */

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

@@ -519,6 +519,23 @@ public static void assertNNHasCheckpoints(MiniDFSCluster cluster,
     }
   }
 
+  public static void assertNNHasRollbackCheckpoints(MiniDFSCluster cluster,
+      int nnIdx, List<Integer> txids) {
+
+    for (File nameDir : getNameNodeCurrentDirs(cluster, nnIdx)) {
+      LOG.info("examining name dir with files: " +
+                   Joiner.on(",").join(nameDir.listFiles()));
+      // Should have fsimage_N for the three checkpoints
+      LOG.info("Examining storage dir " + nameDir + " with contents: "
+                   + StringUtils.join(nameDir.listFiles(), ", "));
+      for (long checkpointTxId : txids) {
+        File image = new File(nameDir,
+            NNStorage.getRollbackImageFileName(checkpointTxId));
+        assertTrue("Expected non-empty " + image, image.length() > 0);
+      }
+    }
+  }
+
   public static List<File> getNameNodeCurrentDirs(MiniDFSCluster cluster, int nnIdx) {
     List<File> nameDirs = Lists.newArrayList();
     for (URI u : cluster.getNameDirs(nnIdx)) {

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

@@ -36,6 +36,7 @@
 import java.util.function.Supplier;
 import org.apache.hadoop.hdfs.DistributedFileSystem;
 import org.apache.hadoop.hdfs.protocol.HdfsConstants.RollingUpgradeAction;
+import org.apache.hadoop.hdfs.protocol.RollingUpgradeInfo;
 import org.apache.hadoop.hdfs.server.common.HttpGetFailedException;
 import org.apache.hadoop.hdfs.server.namenode.FSImage;
 import org.apache.hadoop.hdfs.server.namenode.NameNodeLayoutVersion;
@@ -189,7 +190,8 @@ public void testDownloadingLaterCheckpoint() throws Exception {
    */
   @Test
   public void testRollingUpgradeBootstrapStandby() throws Exception {
-    removeStandbyNameDirs();
+    // This node is needed to create the rollback fsimage
+    cluster.restartNameNode(1);
 
     int futureVersion = NameNodeLayoutVersion.CURRENT_LAYOUT_VERSION - 1;
 
@@ -208,12 +210,21 @@ public void testRollingUpgradeBootstrapStandby() throws Exception {
 
     // BootstrapStandby should fail if the node has a future version
     // and the cluster isn't in rolling upgrade
-    bs.setConf(cluster.getConfiguration(1));
+    bs.setConf(cluster.getConfiguration(2));
     assertEquals("BootstrapStandby should return ERR_CODE_INVALID_VERSION",
         ERR_CODE_INVALID_VERSION, bs.run(new String[]{"-force"}));
 
     // Start rolling upgrade
     fs.rollingUpgrade(RollingUpgradeAction.PREPARE);
+    RollingUpgradeInfo info = fs.rollingUpgrade(RollingUpgradeAction.QUERY);
+    while (!info.createdRollbackImages()) {
+      Thread.sleep(1000);
+      info = fs.rollingUpgrade(RollingUpgradeAction.QUERY);
+    }
+    // After the rollback image is created the standby is not needed
+    cluster.shutdownNameNode(1);
+    removeStandbyNameDirs();
+
     nn0 = spy(nn0);
 
     // Make nn0 think it is a future version
@@ -237,6 +248,9 @@ public void testRollingUpgradeBootstrapStandby() throws Exception {
 
     long expectedCheckpointTxId = NameNodeAdapter.getNamesystem(nn0)
         .getFSImage().getMostRecentCheckpointTxId();
+    long expectedRollbackTxId = NameNodeAdapter.getNamesystem(nn0)
+       .getFSImage().getMostRecentNameNodeFileTxId(
+           NNStorage.NameNodeFile.IMAGE_ROLLBACK);
     assertEquals(11, expectedCheckpointTxId);
 
     for (int i = 1; i < maxNNCount; i++) {
@@ -245,6 +259,8 @@ public void testRollingUpgradeBootstrapStandby() throws Exception {
       bs.run(new String[]{"-force"});
       FSImageTestUtil.assertNNHasCheckpoints(cluster, i,
           ImmutableList.of((int) expectedCheckpointTxId));
+      FSImageTestUtil.assertNNHasRollbackCheckpoints(cluster, i,
+          ImmutableList.of((int) expectedRollbackTxId));
     }
 
     // Make sure the bootstrap was successful
@@ -253,6 +269,13 @@ public void testRollingUpgradeBootstrapStandby() throws Exception {
     // We should now be able to start the standby successfully
     restartNameNodesFromIndex(1, "-rollingUpgrade", "started");
 
+    for (int i = 1; i < maxNNCount; i++) {
+      assertTrue("NameNodes should all have the rollback FSImage",
+          cluster.getNameNode(i).getFSImage().hasRollbackFSImage());
+      assertTrue("NameNodes should all be inRollingUpgrade",
+          cluster.getNameNode(i).getNamesystem().isRollingUpgrade());
+    }
+
     // Cleanup standby dirs
     for (int i = 1; i < maxNNCount; i++) {
       cluster.shutdownNameNode(i);