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

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.


  private static Scanner createCloneScanner(String tableId, Connector conn) throws TableNotFoundException {
    String tableName = MetadataTable.NAME;
    if (tableId.equals(MetadataTable.ID))
      tableName = RootTable.NAME;
    Scanner mscanner = new IsolatedScanner(conn.createScanner(tableName, Authorizations.EMPTY));
    mscanner.setRange(new KeyExtent(new Text(tableId), null, null).toMetadataRange());
    mscanner.fetchColumnFamily(DataFileColumnFamily.NAME);
    mscanner.fetchColumnFamily(TabletsSection.CurrentLocationColumnFamily.NAME);
    mscanner.fetchColumnFamily(TabletsSection.LastLocationColumnFamily.NAME);
    mscanner.fetchColumnFamily(ClonedColumnFamily.NAME);
    TabletsSection.TabletColumnFamily.PREV_ROW_COLUMN.fetch(mscanner);
    TabletsSection.ServerColumnFamily.TIME_COLUMN.fetch(mscanner);
    return mscanner;
  }

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    ChoppedColumnFamily.CHOPPED_COLUMN.put(m, new Value("chopped".getBytes(Constants.UTF8)));
    update(SystemCredentials.get(), zooLock, m, extent);
  }


  public static void removeBulkLoadEntries(Connector conn, String tableId, long tid) throws Exception {
    Scanner mscanner = new IsolatedScanner(conn.createScanner(MetadataTable.NAME, Authorizations.EMPTY));
    mscanner.setRange(new KeyExtent(new Text(tableId), null, null).toMetadataRange());
    mscanner.fetchColumnFamily(TabletsSection.BulkFileColumnFamily.NAME);
    BatchWriter bw = conn.createBatchWriter(MetadataTable.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<FileRef> getBulkFilesLoaded(Connector conn, KeyExtent extent, long tid) throws IOException {
    List<FileRef> result = new ArrayList<FileRef>();
    try {
      VolumeManager fs = VolumeManagerImpl.get();
      Scanner mscanner = new IsolatedScanner(conn.createScanner(extent.isMeta() ? RootTable.NAME : MetadataTable.NAME, Authorizations.EMPTY));
      mscanner.setRange(extent.toMetadataRange());
      mscanner.fetchColumnFamily(TabletsSection.BulkFileColumnFamily.NAME);
      for (Entry<Key,Value> entry : mscanner) {
        if (Long.parseLong(entry.getValue().toString()) == tid) {
          result.add(new FileRef(fs, entry.getKey()));
        }
      }

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     * have no loaded markers.
     */


    // determine which failed files were loaded
    Connector conn = master.getConnector();
    Scanner mscanner = new IsolatedScanner(conn.createScanner(MetadataTable.NAME, Authorizations.EMPTY));
    mscanner.setRange(new KeyExtent(new Text(tableId), null, null).toMetadataRange());
    mscanner.fetchColumnFamily(TabletsSection.BulkFileColumnFamily.NAME);


    for (Entry<Key,Value> entry : mscanner) {
      if (Long.parseLong(entry.getValue().toString()) == tid) {
        FileRef loadedFile = new FileRef(fs, entry.getKey());
        String absPath = failures.remove(loadedFile);

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    }


    @Override
    public Iterator<String> getBlipIterator() throws TableNotFoundException, AccumuloException, AccumuloSecurityException {
      IsolatedScanner scanner = new IsolatedScanner(instance.getConnector(credentials.getPrincipal(), credentials.getToken()).createScanner(tableName,
          Authorizations.EMPTY));


      scanner.setRange(MetadataSchema.BlipSection.getRange());


      return Iterators.transform(scanner.iterator(), new Function<Entry<Key,Value>,String>() {
        @Override
        public String apply(Entry<Key,Value> entry) {
          return entry.getKey().getRow().toString().substring(MetadataSchema.BlipSection.getRowPrefix().length());
        }
      });

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      });
    }


    @Override
    public Iterator<Entry<Key,Value>> getReferenceIterator() throws TableNotFoundException, AccumuloException, AccumuloSecurityException {
      IsolatedScanner scanner = new IsolatedScanner(instance.getConnector(credentials.getPrincipal(), credentials.getToken()).createScanner(tableName,
          Authorizations.EMPTY));
      scanner.fetchColumnFamily(DataFileColumnFamily.NAME);
      scanner.fetchColumnFamily(ScanFileColumnFamily.NAME);
      TabletsSection.ServerColumnFamily.DIRECTORY_COLUMN.fetch(scanner);
      TabletIterator tabletIterator = new TabletIterator(scanner, MetadataSchema.TabletsSection.getRange(), false, true);


      return Iterators.concat(Iterators.transform(tabletIterator, new Function<Map<Key,Value>,Iterator<Entry<Key,Value>>>() {
        @Override

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      String metaTable = MetadataTable.NAME;
      if (tableId.equals(MetadataTable.ID))
        metaTable = RootTable.NAME;
      Scanner scanner = instance.getConnector(credentials.getPrincipal(), credentials.getToken()).createScanner(metaTable, Authorizations.EMPTY);
      scanner = new IsolatedScanner(scanner);
      TabletsSection.TabletColumnFamily.PREV_ROW_COLUMN.fetch(scanner);
      scanner.fetchColumnFamily(TabletsSection.CurrentLocationColumnFamily.NAME);
      scanner.setRange(range);


      RowIterator rowIter = new RowIterator(scanner);

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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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        serversToFlush.clear();
        
        try {
          Connector conn = getConnector();
          Scanner scanner = new IsolatedScanner(conn.createScanner(Constants.METADATA_TABLE_NAME, Constants.NO_AUTHS));
          ColumnFQ.fetch(scanner, Constants.METADATA_FLUSH_COLUMN);
          ColumnFQ.fetch(scanner, Constants.METADATA_DIRECTORY_COLUMN);
          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());
          
          // TODO this used to be TabletIterator... any problems with splits/merges?
          RowIterator ri = new RowIterator(scanner);
          
          int tabletsToWaitFor = 0;

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