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.

    
    Thread writer = new Thread(new Writer(conn.createBatchWriter(opts.tableName, bwOpts.getBatchWriterConfig()), opts.iterations));
    writer.start();
    Reader r;
    if (opts.isolated)
      r = new Reader(new IsolatedScanner(conn.createScanner(opts.tableName, opts.auths)));
    else
      r = new Reader(conn.createScanner(opts.tableName, opts.auths));
    Thread reader;
    reader = new Thread(r);
    reader.start();

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     */


    // determine which failed files were loaded
    AuthInfo creds = SecurityConstants.getSystemCredentials();
    Connector conn = HdfsZooInstance.getInstance().getConnector(creds.user, creds.password);
    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);
    
    for (Entry<Key,Value> entry : mscanner) {
      if (Long.parseLong(entry.getValue().toString()) == tid) {
        String loadedFile = entry.getKey().getColumnQualifier().toString();
        String absPath = failures.remove(loadedFile);

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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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    List<String> tableNames = (List<String>) state.get("tables");
    
    String tableName = tableNames.get(rand.nextInt(tableNames.size()));
    
    try {
      RowIterator iter = new RowIterator(new IsolatedScanner(conn.createScanner(tableName, Authorizations.EMPTY)));
      
      while (iter.hasNext()) {
        PeekingIterator<Entry<Key,Value>> row = new PeekingIterator<Entry<Key,Value>>(iter.next());
        Entry<Key,Value> kv = null;
        if (row.hasNext())

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  private void verifyBank(String table, Connector conn, String row, int numAccts) throws TableNotFoundException, Exception {
    log.debug("Verifying bank " + row);


    // TODO do not use IsolatedScanner, just enable isolation on scanner
    Scanner scanner = new IsolatedScanner(conn.createScanner(table, Authorizations.EMPTY));


    scanner.setRange(new Range(row));
    IteratorSetting iterConf = new IteratorSetting(100, "cqsl", ColumnSliceFilter.class);
    ColumnSliceFilter.setSlice(iterConf, "bal", true, "bal", true);
    scanner.clearScanIterators();
    scanner.addScanIterator(iterConf);


    int count = 0;
    int sum = 0;
    int min = Integer.MAX_VALUE;
    int max = Integer.MIN_VALUE;

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  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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      // intentionally not using zipf distribution to pick on retry
      acct2 = Utils.getAccount(rand.nextInt(numAccts));
    }


    // TODO document how data should be read when using ConditionalWriter
    Scanner scanner = new IsolatedScanner(conn.createScanner(table, Authorizations.EMPTY));


    scanner.setRange(new Range(bank));
    scanner.fetchColumnFamily(new Text(acct1));
    scanner.fetchColumnFamily(new Text(acct2));


    Account a1 = new Account();
    Account a2 = new Account();
    Account a;

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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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Related Classes of org.apache.accumulo.core.client.IsolatedScanner

org.apache.accumulo.core.client.impl.ScannerOptions

org.apache.accumulo.core.client.impl.TableOperationsImpl

org.apache.accumulo.core.client.mapred.AbstractInputFormat$AbstractRecordReader

org.apache.accumulo.core.client.mapred.InputFormatBase$RecordReaderBase

org.apache.accumulo.core.client.mapreduce.AbstractInputFormat$AbstractRecordReader

org.apache.accumulo.core.client.mapreduce.AccumuloInputFormat

org.apache.accumulo.core.client.mapreduce.InputFormatBase$RecordReaderBase

org.apache.accumulo.core.data.ByteSequence

org.apache.accumulo.core.data.Key

org.apache.accumulo.core.data.Range

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