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.

      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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      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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   */
  private synchronized void refreshItemIDs() throws IOException {
    // Get the list of item ids
    HTableInterface table = pool.getTable(tableName);
    Scan scan = new Scan(new byte[]{0x69}, new byte[]{0x70});
    scan.setFilter(new FilterList(FilterList.Operator.MUST_PASS_ALL, new KeyOnlyFilter(), new FirstKeyOnlyFilter()));
    ResultScanner scanner = table.getScanner(scan);
    Collection<Long> ids = Lists.newLinkedList();
    for (Result result : scanner) {
      ids.add(bytesToUserOrItemID(result.getRow()));
    }

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   */
  private synchronized void refreshUserIDs() throws IOException {
    // Get the list of user ids
    HTableInterface table = pool.getTable(tableName);
    Scan scan = new Scan(new byte[]{0x75}, new byte[]{0x76});
    scan.setFilter(new FilterList(FilterList.Operator.MUST_PASS_ALL, new KeyOnlyFilter(), new FirstKeyOnlyFilter()));
    ResultScanner scanner = table.getScanner(scan);
    Collection<Long> ids = Lists.newLinkedList();
    for (Result result : scanner) {
      ids.add(bytesToUserOrItemID(result.getRow()));
    }

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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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     */
    private void deleteRowsInRange(byte[] start, byte[] end) {
        final Scan scan = new Scan(start, end).setFilter(
                new FilterList(
                        new FirstKeyOnlyFilter(),
                        new KeyOnlyFilter()));


        try {
            hTable.coprocessorExec(
                    BulkDeleteProtocol.class, start, end, new Batch.Call<BulkDeleteProtocol, BulkDeleteResponse>() {
                        @Override

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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();

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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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        HBaseClient client = (HBaseClient) clients.get("hbaseTest");


        Filter filter = new PrefixFilter(Bytes.toBytes("100" + "_"));


        client.setFilter(new KeyOnlyFilter());
        client.addFilter("city_similarity", filter);


        String query2 = "select u from CitySimilarity u";
        com.impetus.kundera.query.Query queryObject = (com.impetus.kundera.query.Query) em
                .createQuery(query2);

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        HBaseClient client = (HBaseClient) clients.get("hbaseTest");


        Filter filter = new PrefixFilter(Bytes.toBytes("100" + "_"));


        client.addFilter("city_similarity", filter);
        client.addFilter("bookinfo", new KeyOnlyFilter());


        String query2 = "select u from CitySimilarity u";
        com.impetus.kundera.query.Query queryObject = (com.impetus.kundera.query.Query) em
                .createQuery(query2);

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