Examples of org.apache.hadoop.hbase.filter.KeyOnlyFilter

org.apache.hadoop.hbase.filter.KeyOnlyFilter
A filter that will only return the key component of each KV (the value will be rewritten as empty).
This filter can be used to grab all of the keys without having to also grab the values.

      ResultScanner rs = null;
      try {
        Scan s = new Scan();
        s.setBatch(2);
        s.addFamily(FAMILY);
        s.setFilter(new KeyOnlyFilter());
        s.setMaxVersions(1);


        rs = table.getScanner(s);
        Result result = rs.next();
        return result != null && result.size() > 0;

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        break;
      case InclusiveStopFilter:
        filter = new InclusiveStopFilter(Base64.decode(value));
        break;
      case KeyOnlyFilter:
        filter = new KeyOnlyFilter();
        break;
      case MultipleColumnPrefixFilter: {
        byte[][] values = new byte[prefixes.size()][];
        for (int i = 0; i < prefixes.size(); i++) {
          values[i] = Base64.decode(prefixes.get(i));

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      put.add(FAMILY, QUALIFIERS[i], VALUE);
      ht.put(put);
    }
    Scan scan = new Scan();
    scan.addFamily(FAMILY);
    Filter filter = new KeyOnlyFilter(true);
    scan.setFilter(filter);
    ResultScanner scanner = ht.getScanner(scan);
    int count = 0;
    for(Result result : ht.getScanner(scan)) {
      assertEquals(result.size(), 1);

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      ht.put(put);
    }
    Scan scan = new Scan();
    scan.setReversed(true);
    scan.addFamily(FAMILY);
    Filter filter = new KeyOnlyFilter(true);
    scan.setFilter(filter);
    ResultScanner scanner = ht.getScanner(scan);
    int count = 0;
    for (Result result : ht.getScanner(scan)) {
      assertEquals(result.size(), 1);

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      put.add(FAMILY, QUALIFIERS[i], VALUE);
      ht.put(put);
    }
    Scan scan = new Scan();
    scan.addFamily(FAMILY);
    Filter filter = new KeyOnlyFilter(true);
    scan.setFilter(filter);
    ResultScanner scanner = ht.getScanner(scan);
    int count = 0;
    for(Result result : ht.getScanner(scan)) {
      assertEquals(result.size(), 1);

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        HTableInterface hTable = services.getTable(tableRef.getTable().getPhysicalName().getBytes());
        try {
            byte[] minKey = null, maxKey = null;
            // Do a key-only scan to get the first row of a table. This is the min
            // key for the table.
            Scan scan = new Scan(HConstants.EMPTY_START_ROW, new KeyOnlyFilter());
            ResultScanner scanner = hTable.getScanner(scan);
            try {
                Result r = scanner.next(); 
                if (r != null) {
                    minKey = r.getRow();
                }
            } finally {
                scanner.close();
            }
            
            // Get max possible key value
            scan = new Scan();
            scan.setFilter(new KeyOnlyFilter());
            scan.setReversed(true);
            scanner = hTable.getScanner(scan);
            try {
                Result r = scanner.next(); 
                if (r != null) {

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      put.add(FAMILY, QUALIFIERS[i], VALUE);
      ht.put(put);
    }
    Scan scan = new Scan();
    scan.addFamily(FAMILY);
    Filter filter = new KeyOnlyFilter(true);
    scan.setFilter(filter);
    ResultScanner scanner = ht.getScanner(scan);
    int count = 0;
    for(Result result : ht.getScanner(scan)) {
      assertEquals(result.size(), 1);

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      ht.put(put);
    }
    Scan scan = new Scan();
    scan.setReversed(true);
    scan.addFamily(FAMILY);
    Filter filter = new KeyOnlyFilter(true);
    scan.setFilter(filter);
    ResultScanner scanner = ht.getScanner(scan);
    int count = 0;
    for (Result result : ht.getScanner(scan)) {
      assertEquals(result.size(), 1);

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      put.add(FAMILY, QUALIFIERS[i], VALUE);
      ht.put(put);
    }
    Scan scan = new Scan();
    scan.addFamily(FAMILY);
    Filter filter = new KeyOnlyFilter(true);
    scan.setFilter(filter);
    ResultScanner scanner = ht.getScanner(scan);
    int count = 0;
    for(Result result : ht.getScanner(scan)) {
      assertEquals(result.size(), 1);

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      ht.put(put);
    }
    Scan scan = new Scan();
    scan.setReversed(true);
    scan.addFamily(FAMILY);
    Filter filter = new KeyOnlyFilter(true);
    scan.setFilter(filter);
    ResultScanner scanner = ht.getScanner(scan);
    int count = 0;
    for (Result result : ht.getScanner(scan)) {
      assertEquals(result.size(), 1);

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