Examples of org.apache.accumulo.core.client.IsolatedScanner

org.apache.accumulo.core.client.IsolatedScanner
A scanner that presents a row isolated view of an accumulo table. Rows are buffered in memory on the client side. If you think your rows may not fit into memory, then you can provide an alternative row buffer factory to the constructor. This would allow rows to be buffered to disk for example.

    Constants.METADATA_CHOPPED_COLUMN.put(m, new Value("chopped".getBytes(Constants.UTF8)));
    update(SecurityConstants.getSystemCredentials(), zooLock, m);
  }
  
  public static void removeBulkLoadEntries(Connector conn, String tableId, long tid) throws Exception {
    Scanner mscanner = new IsolatedScanner(conn.createScanner(Constants.METADATA_TABLE_NAME, Constants.NO_AUTHS));
    mscanner.setRange(new KeyExtent(new Text(tableId), null, null).toMetadataRange());
    mscanner.fetchColumnFamily(Constants.METADATA_BULKFILE_COLUMN_FAMILY);
    BatchWriter bw = conn.createBatchWriter(Constants.METADATA_TABLE_NAME, new BatchWriterConfig());
    for (Entry<Key,Value> entry : mscanner) {
      log.debug("Looking at entry " + entry + " with tid " + tid);
      if (Long.parseLong(entry.getValue().toString()) == tid) {
        log.debug("deleting entry " + entry);

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  }
  
  public static List<String> getBulkFilesLoaded(Connector conn, KeyExtent extent, long tid) {
    List<String> result = new ArrayList<String>();
    try {
      Scanner mscanner = new IsolatedScanner(conn.createScanner(Constants.METADATA_TABLE_NAME, Constants.NO_AUTHS));
      mscanner.setRange(extent.toMetadataRange());
      mscanner.fetchColumnFamily(Constants.METADATA_BULKFILE_COLUMN_FAMILY);
      for (Entry<Key,Value> entry : mscanner) {
        if (Long.parseLong(entry.getValue().toString()) == tid) {
          result.add(entry.getKey().getColumnQualifier().toString());
        }
      }

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        serversToFlush.clear();
        
        try {
          Connector conn = getConnector();
          Scanner scanner = new IsolatedScanner(conn.createScanner(Constants.METADATA_TABLE_NAME, Constants.NO_AUTHS));
          Constants.METADATA_FLUSH_COLUMN.fetch(scanner);
          Constants.METADATA_DIRECTORY_COLUMN.fetch(scanner);
          scanner.fetchColumnFamily(Constants.METADATA_CURRENT_LOCATION_COLUMN_FAMILY);
          scanner.fetchColumnFamily(Constants.METADATA_LOG_COLUMN_FAMILY);
          scanner.setRange(new KeyExtent(new Text(tableId), null, ByteBufferUtil.toText(startRow)).toMetadataRange());
          
          RowIterator ri = new RowIterator(scanner);
          
          int tabletsToWaitFor = 0;
          int tabletCount = 0;

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  @Override
  public T get(K key, String[] fields) {
    try {
      // TODO make isolated scanner optional?
      Scanner scanner = new IsolatedScanner(conn.createScanner(mapping.tableName, Constants.NO_AUTHS));
      Range rowRange = new Range(new Text(toBytes(key)));


      scanner.setRange(rowRange);
      setFetchColumns(scanner, fields);


      T persistent = newPersistent();
      ByteSequence row = populate(scanner.iterator(), persistent);
      if (row == null)
        return null;
      return persistent;
    } catch (TableNotFoundException e) {
      LOG.error(e.getMessage(), e);

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  }


  private Scanner createScanner(Query<K,T> query) throws TableNotFoundException {
    // TODO make isolated scanner optional?
    Scanner scanner = new IsolatedScanner(conn.createScanner(mapping.tableName, Constants.NO_AUTHS));
    setFetchColumns(scanner, query.getFields());


    scanner.setRange(createRange(query));


    if (query.getStartTime() != -1 || query.getEndTime() != -1) {
      IteratorSetting is = new IteratorSetting(30, TimestampFilter.class);
      if (query.getStartTime() != -1)
        TimestampFilter.setStart(is, query.getStartTime(), true);
      if (query.getEndTime() != -1)
        TimestampFilter.setEnd(is, query.getEndTime(), true);


      scanner.addScanIterator(is);
    }


    return scanner;
  }

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  @Override
  public T get(K key, String[] fields) throws IOException {
    try {
      // TODO make isolated scanner optional?
      Scanner scanner = new IsolatedScanner(conn.createScanner(mapping.tableName, Constants.NO_AUTHS));
      Range rowRange = new Range(new Text(toBytes(key)));
      
      scanner.setRange(rowRange);
      setFetchColumns(scanner, fields);
      
      T persistent = newPersistent();
      ByteSequence row = populate(scanner.iterator(), persistent);
      if (row == null)
        return null;
      return persistent;
    } catch (TableNotFoundException e) {
      return null;

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  }
  
  private Scanner createScanner(Query<K,T> query) throws TableNotFoundException {
    // TODO make isolated scanner optional?
    Scanner scanner = new IsolatedScanner(conn.createScanner(mapping.tableName, Constants.NO_AUTHS));
    setFetchColumns(scanner, query.getFields());
    
    scanner.setRange(createRange(query));
    
    if (query.getStartTime() != -1 || query.getEndTime() != -1) {
      IteratorSetting is = new IteratorSetting(30, TimestampFilter.class);
      if (query.getStartTime() != -1)
        TimestampFilter.setStart(is, query.getStartTime(), true);
      if (query.getEndTime() != -1)
        TimestampFilter.setEnd(is, query.getEndTime(), true);
      
      scanner.addScanIterator(is);
    }
    
    return scanner;
  }

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        // general solution to solve contention problems like this. However in this particular case, exponential back-off could penalize the earliest threads
        // that attempted to make a reservation by putting them later in the list. A more complex solution could involve having independent sub-queues within
        // the row that approximately maintain arrival order and use exponential back off to fairly merge the sub-queues into the main queue.
        
        // it is important to use an isolated scanner so that only whole mutations are seen
        Scanner scanner = new IsolatedScanner(conn.createScanner(rTable, Authorizations.EMPTY));
        scanner.setRange(new Range(row));
        
        int seq = -1;
        int maxReservation = -1;
        
        for (Entry<Key,Value> entry : scanner) {

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    try {
      while (true) {
        
        // its important to use an isolated scanner so that only whole mutations are seen
        Scanner scanner = new IsolatedScanner(conn.createScanner(rTable, Authorizations.EMPTY));
        scanner.setRange(new Range(row));
        
        int seq = -1;
        String reservation = null;
        
        for (Entry<Key,Value> entry : scanner) {

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  public List<String> list(String what, String when) throws Exception {
    String row = what + ":" + when;
    
    // its important to use an isolated scanner so that only whole mutations are seen
    Scanner scanner = new IsolatedScanner(conn.createScanner(rTable, Authorizations.EMPTY));
    scanner.setRange(new Range(row));
    scanner.fetchColumnFamily(new Text("res"));
    
    List<String> reservations = new ArrayList<String>();
    
    for (Entry<Key,Value> entry : scanner) {
      String val = entry.getValue().toString();

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