Package org.apache.hadoop.hbase.filter

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

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            // be quite a bit faster.
            if (familyMap.isEmpty() && table.getColumnFamilies().size() == 1) {
                // Project the one column family. We must project a column family since it's possible
                // that there are other non declared column families that we need to ignore.
                scan.addFamily(table.getColumnFamilies().get(0).getName().getBytes());
                ScanUtil.andFilterAtBeginning(scan, new FirstKeyOnlyFilter());
            } else {
                byte[] ecf = SchemaUtil.getEmptyColumnFamily(table.getColumnFamilies());
                // Project empty key value unless the column family containing it has
                // been projected in its entirety.
                if (!familyMap.containsKey(ecf) || familyMap.get(ecf) != null) {
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        stop[prefix.length - 1]++; // this is safe because the last byte is always '/'

        Scan scan = new Scan();
        scan.setStartRow(prefix);
        scan.setStopRow(stop);
        scan.setFilter(new FirstKeyOnlyFilter());
        scan.setMaxVersions(1);
        ResultScanner resultScanner = hTable.getScanner(scan);

        List<Delete> deletes = Lists.newArrayList();
        Result result;
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        stop[prefix.length - 1]++; // this is safe because the last byte is always '/'

        Scan scan = new Scan();
        scan.setStartRow(prefix);
        scan.setStopRow(stop);
        scan.setFilter(new FirstKeyOnlyFilter());
        scan.setMaxVersions(1);
        ResultScanner resultScanner = hTable.getScanner(scan);

        List<Delete> deletes = Lists.newArrayList();
        Result result;
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    List<Delete> deletes = Lists.newArrayListWithCapacity(deletesPerRound);
    // repeatedly scan a batch rows to detect their row keys, then delete all in a single call.
    Scan scan = new Scan();
    scan.setTimeRange(0, HConstants.LATEST_TIMESTAMP);
    scan.setMaxVersions(1); // we only need to see one version of each row
    scan.setFilter(new FirstKeyOnlyFilter()); // we only need to see the first column (=key) of each row
    scan.setStartRow(prefix);
    ResultScanner scanner = this.hTable.getScanner(scan);
    try {
      Result result;
      while ((result = scanner.next()) != null) {
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    return result;
  }

  @Override
  public long getRowCount() throws IOException {
    return getRowCount(new FirstKeyOnlyFilter());
  }
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       * to fetch only one KV from each row. If a filter is already part of this
       * scan, add the FirstKeyOnlyFilter as the LAST filter of a MUST_PASS_ALL
       * FilterList.
       */
      hbaseScan.setFilter(
          HBaseUtils.andFilterAtIndex(hbaseScan.getFilter(), HBaseUtils.LAST_FILTER, new FirstKeyOnlyFilter())
          );
    }
    hbaseScan.setCaching(TARGET_RECORD_COUNT);
  }
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    // TODO: think over limiting of fetched data: set single columnFam:qual with small value to fetch
    Scan scan = new Scan(firstInclusive, lastNonInclusive);
    // TODO: make configurable?
    scan.setCaching(1024);

    scan.setFilter(new FirstKeyOnlyFilter());

    return scan;
  }
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