Java Code Examples for org.apache.hadoop.hdfs.server.common.Storage.StorageState

The following examples show how to use org.apache.hadoop.hdfs.server.common.Storage.StorageState. These examples are extracted from open source projects. You can vote up the ones you like or vote down the ones you don't like, and go to the original project or source file by following the links above each example. You may check out the related API usage on the sidebar.
Example 1
Source Project: hadoop   Source File: BackupImage.java    License: Apache License 2.0 5 votes vote down vote up
/**
 * Analyze backup storage directories for consistency.<br>
 * Recover from incomplete checkpoints if required.<br>
 * Read VERSION and fstime files if exist.<br>
 * Do not load image or edits.
 *
 * @throws IOException if the node should shutdown.
 */
void recoverCreateRead() throws IOException {
  for (Iterator<StorageDirectory> it = storage.dirIterator(); it.hasNext();) {
    StorageDirectory sd = it.next();
    StorageState curState;
    try {
      curState = sd.analyzeStorage(HdfsServerConstants.StartupOption.REGULAR, storage);
      // sd is locked but not opened
      switch(curState) {
      case NON_EXISTENT:
        // fail if any of the configured storage dirs are inaccessible
        throw new InconsistentFSStateException(sd.getRoot(),
              "checkpoint directory does not exist or is not accessible.");
      case NOT_FORMATTED:
        // for backup node all directories may be unformatted initially
        LOG.info("Storage directory " + sd.getRoot() + " is not formatted.");
        LOG.info("Formatting ...");
        sd.clearDirectory(); // create empty current
        break;
      case NORMAL:
        break;
      default:  // recovery is possible
        sd.doRecover(curState);
      }
      if(curState != StorageState.NOT_FORMATTED) {
        // read and verify consistency with other directories
        storage.readProperties(sd);
      }
    } catch(IOException ioe) {
      sd.unlock();
      throw ioe;
    }
  }
}
 
Example 2
Source Project: big-c   Source File: BackupImage.java    License: Apache License 2.0 5 votes vote down vote up
/**
 * Analyze backup storage directories for consistency.<br>
 * Recover from incomplete checkpoints if required.<br>
 * Read VERSION and fstime files if exist.<br>
 * Do not load image or edits.
 *
 * @throws IOException if the node should shutdown.
 */
void recoverCreateRead() throws IOException {
  for (Iterator<StorageDirectory> it = storage.dirIterator(); it.hasNext();) {
    StorageDirectory sd = it.next();
    StorageState curState;
    try {
      curState = sd.analyzeStorage(HdfsServerConstants.StartupOption.REGULAR, storage);
      // sd is locked but not opened
      switch(curState) {
      case NON_EXISTENT:
        // fail if any of the configured storage dirs are inaccessible
        throw new InconsistentFSStateException(sd.getRoot(),
              "checkpoint directory does not exist or is not accessible.");
      case NOT_FORMATTED:
        // for backup node all directories may be unformatted initially
        LOG.info("Storage directory " + sd.getRoot() + " is not formatted.");
        LOG.info("Formatting ...");
        sd.clearDirectory(); // create empty current
        break;
      case NORMAL:
        break;
      default:  // recovery is possible
        sd.doRecover(curState);
      }
      if(curState != StorageState.NOT_FORMATTED) {
        // read and verify consistency with other directories
        storage.readProperties(sd);
      }
    } catch(IOException ioe) {
      sd.unlock();
      throw ioe;
    }
  }
}
 
Example 3
Source Project: hadoop   Source File: FSImage.java    License: Apache License 2.0 4 votes vote down vote up
/**
 * For each storage directory, performs recovery of incomplete transitions
 * (eg. upgrade, rollback, checkpoint) and inserts the directory's storage
 * state into the dataDirStates map.
 * @param dataDirStates output of storage directory states
 * @return true if there is at least one valid formatted storage directory
 */
public static boolean recoverStorageDirs(StartupOption startOpt,
    NNStorage storage, Map<StorageDirectory, StorageState> dataDirStates)
    throws IOException {
  boolean isFormatted = false;
  // This loop needs to be over all storage dirs, even shared dirs, to make
  // sure that we properly examine their state, but we make sure we don't
  // mutate the shared dir below in the actual loop.
  for (Iterator<StorageDirectory> it = 
                    storage.dirIterator(); it.hasNext();) {
    StorageDirectory sd = it.next();
    StorageState curState;
    if (startOpt == StartupOption.METADATAVERSION) {
      /* All we need is the layout version. */
      storage.readProperties(sd);
      return true;
    }

    try {
      curState = sd.analyzeStorage(startOpt, storage);
      // sd is locked but not opened
      switch(curState) {
      case NON_EXISTENT:
        // name-node fails if any of the configured storage dirs are missing
        throw new InconsistentFSStateException(sd.getRoot(),
                    "storage directory does not exist or is not accessible.");
      case NOT_FORMATTED:
        break;
      case NORMAL:
        break;
      default:  // recovery is possible
        sd.doRecover(curState);
      }
      if (curState != StorageState.NOT_FORMATTED 
          && startOpt != StartupOption.ROLLBACK) {
        // read and verify consistency with other directories
        storage.readProperties(sd, startOpt);
        isFormatted = true;
      }
      if (startOpt == StartupOption.IMPORT && isFormatted)
        // import of a checkpoint is allowed only into empty image directories
        throw new IOException("Cannot import image from a checkpoint. " 
            + " NameNode already contains an image in " + sd.getRoot());
    } catch (IOException ioe) {
      sd.unlock();
      throw ioe;
    }
    dataDirStates.put(sd,curState);
  }
  return isFormatted;
}
 
Example 4
Source Project: hadoop   Source File: SecondaryNameNode.java    License: Apache License 2.0 4 votes vote down vote up
/**
 * Analyze checkpoint directories.
 * Create directories if they do not exist.
 * Recover from an unsuccessful checkpoint if necessary.
 *
 * @throws IOException
 */
void recoverCreate(boolean format) throws IOException {
  storage.attemptRestoreRemovedStorage();
  storage.unlockAll();

  for (Iterator<StorageDirectory> it = 
               storage.dirIterator(); it.hasNext();) {
    StorageDirectory sd = it.next();
    boolean isAccessible = true;
    try { // create directories if don't exist yet
      if(!sd.getRoot().mkdirs()) {
        // do nothing, directory is already created
      }
    } catch(SecurityException se) {
      isAccessible = false;
    }
    if(!isAccessible)
      throw new InconsistentFSStateException(sd.getRoot(),
          "cannot access checkpoint directory.");
    
    if (format) {
      // Don't confirm, since this is just the secondary namenode.
      LOG.info("Formatting storage directory " + sd);
      sd.clearDirectory();
    }
    
    StorageState curState;
    try {
      curState = sd.analyzeStorage(HdfsServerConstants.StartupOption.REGULAR, storage);
      // sd is locked but not opened
      switch(curState) {
      case NON_EXISTENT:
        // fail if any of the configured checkpoint dirs are inaccessible 
        throw new InconsistentFSStateException(sd.getRoot(),
              "checkpoint directory does not exist or is not accessible.");
      case NOT_FORMATTED:
        break;  // it's ok since initially there is no current and VERSION
      case NORMAL:
        // Read the VERSION file. This verifies that:
        // (a) the VERSION file for each of the directories is the same,
        // and (b) when we connect to a NN, we can verify that the remote
        // node matches the same namespace that we ran on previously.
        storage.readProperties(sd);
        break;
      default:  // recovery is possible
        sd.doRecover(curState);
      }
    } catch (IOException ioe) {
      sd.unlock();
      throw ioe;
    }
  }
}
 
Example 5
Source Project: big-c   Source File: FSImage.java    License: Apache License 2.0 4 votes vote down vote up
/**
 * For each storage directory, performs recovery of incomplete transitions
 * (eg. upgrade, rollback, checkpoint) and inserts the directory's storage
 * state into the dataDirStates map.
 * @param dataDirStates output of storage directory states
 * @return true if there is at least one valid formatted storage directory
 */
public static boolean recoverStorageDirs(StartupOption startOpt,
    NNStorage storage, Map<StorageDirectory, StorageState> dataDirStates)
    throws IOException {
  boolean isFormatted = false;
  // This loop needs to be over all storage dirs, even shared dirs, to make
  // sure that we properly examine their state, but we make sure we don't
  // mutate the shared dir below in the actual loop.
  for (Iterator<StorageDirectory> it = 
                    storage.dirIterator(); it.hasNext();) {
    StorageDirectory sd = it.next();
    StorageState curState;
    if (startOpt == StartupOption.METADATAVERSION) {
      /* All we need is the layout version. */
      storage.readProperties(sd);
      return true;
    }

    try {
      curState = sd.analyzeStorage(startOpt, storage);
      // sd is locked but not opened
      switch(curState) {
      case NON_EXISTENT:
        // name-node fails if any of the configured storage dirs are missing
        throw new InconsistentFSStateException(sd.getRoot(),
                    "storage directory does not exist or is not accessible.");
      case NOT_FORMATTED:
        break;
      case NORMAL:
        break;
      default:  // recovery is possible
        sd.doRecover(curState);
      }
      if (curState != StorageState.NOT_FORMATTED 
          && startOpt != StartupOption.ROLLBACK) {
        // read and verify consistency with other directories
        storage.readProperties(sd, startOpt);
        isFormatted = true;
      }
      if (startOpt == StartupOption.IMPORT && isFormatted)
        // import of a checkpoint is allowed only into empty image directories
        throw new IOException("Cannot import image from a checkpoint. " 
            + " NameNode already contains an image in " + sd.getRoot());
    } catch (IOException ioe) {
      sd.unlock();
      throw ioe;
    }
    dataDirStates.put(sd,curState);
  }
  return isFormatted;
}
 
Example 6
Source Project: big-c   Source File: SecondaryNameNode.java    License: Apache License 2.0 4 votes vote down vote up
/**
 * Analyze checkpoint directories.
 * Create directories if they do not exist.
 * Recover from an unsuccessful checkpoint if necessary.
 *
 * @throws IOException
 */
void recoverCreate(boolean format) throws IOException {
  storage.attemptRestoreRemovedStorage();
  storage.unlockAll();

  for (Iterator<StorageDirectory> it = 
               storage.dirIterator(); it.hasNext();) {
    StorageDirectory sd = it.next();
    boolean isAccessible = true;
    try { // create directories if don't exist yet
      if(!sd.getRoot().mkdirs()) {
        // do nothing, directory is already created
      }
    } catch(SecurityException se) {
      isAccessible = false;
    }
    if(!isAccessible)
      throw new InconsistentFSStateException(sd.getRoot(),
          "cannot access checkpoint directory.");
    
    if (format) {
      // Don't confirm, since this is just the secondary namenode.
      LOG.info("Formatting storage directory " + sd);
      sd.clearDirectory();
    }
    
    StorageState curState;
    try {
      curState = sd.analyzeStorage(HdfsServerConstants.StartupOption.REGULAR, storage);
      // sd is locked but not opened
      switch(curState) {
      case NON_EXISTENT:
        // fail if any of the configured checkpoint dirs are inaccessible 
        throw new InconsistentFSStateException(sd.getRoot(),
              "checkpoint directory does not exist or is not accessible.");
      case NOT_FORMATTED:
        break;  // it's ok since initially there is no current and VERSION
      case NORMAL:
        // Read the VERSION file. This verifies that:
        // (a) the VERSION file for each of the directories is the same,
        // and (b) when we connect to a NN, we can verify that the remote
        // node matches the same namespace that we ran on previously.
        storage.readProperties(sd);
        break;
      default:  // recovery is possible
        sd.doRecover(curState);
      }
    } catch (IOException ioe) {
      sd.unlock();
      throw ioe;
    }
  }
}
 
Example 7
Source Project: RDFS   Source File: DataStorage.java    License: Apache License 2.0 4 votes vote down vote up
ArrayList<StorageDirectory> analyzeStorageDirs(NamespaceInfo nsInfo,
        Collection<File> dataDirs,
        StartupOption startOpt
        ) throws IOException {
  
  if (storageID == null)
    this.storageID = "";

  if (storageDirs == null) {
    this.storageDirs = new ArrayList<StorageDirectory>(dataDirs.size());
  } else {
    ((ArrayList<StorageDirectory>) storageDirs)
        .ensureCapacity(storageDirs.size() + dataDirs.size());
  }

  ArrayList<StorageDirectory> newDirs = new ArrayList<StorageDirectory>(
      dataDirs.size());
  ArrayList<StorageState> dataDirStates = new ArrayList<StorageState>(dataDirs.size());
  for(Iterator<File> it = dataDirs.iterator(); it.hasNext();) {
    File dataDir = it.next();
    StorageDirectory sd = new StorageDirectory(dataDir);
    StorageState curState;
    try {
      curState = sd.analyzeStorage(startOpt);
      // sd is locked but not opened
      switch(curState) {
        case NORMAL:
          break;
        case NON_EXISTENT:
          // ignore this storage
          LOG.info("Storage directory " + dataDir + " does not exist.");
          it.remove();
          continue;
        case NOT_FORMATTED: // format
          LOG.info("Storage directory " + dataDir + " is not formatted.");
          if (!sd.isEmpty()) {
            LOG.error("Storage directory " + dataDir
              + " is not empty, and will not be formatted! Exiting.");
            throw new IOException(
              "Storage directory " + dataDir + " is not empty!");
          }
          LOG.info("Formatting ...");
          format(sd, nsInfo);
          break;
        default:  // recovery part is common
          sd.doRecover(curState);
      }
    } catch (IOException ioe) {
      try {
        sd.unlock();
      }
      catch (IOException e) {
        LOG.warn("Exception when unlocking storage directory", e);
      }
      LOG.warn("Ignoring storage directory " + dataDir, ioe);
      //continue with other good dirs
      continue;
    }
    // add to the storage list
    addStorageDir(sd);
    newDirs.add(sd);
    dataDirStates.add(curState);
  }
  
  if (dataDirs.size() == 0)  // none of the data dirs exist
      throw new IOException(
                        "All specified directories are not accessible or do not exist.");
  
  return newDirs;
}