Examples of org.apache.hadoop.hbase.client.ResultScanner

org.apache.hadoop.hbase.client.ResultScanner
Interface for client-side scanning. Go to {@link HTable} to obtain instances.

        }


        long result = 0;
        final HTableInterface hTable = _tablePool.getTable(table.getName());
        try {
            ResultScanner scanner = hTable.getScanner(new Scan());
            try {
                while (scanner.next() != null) {
                    result++;
                }
            } finally {
                scanner.close();
            }
            return result;
        } catch (IOException e) {
            throw new MetaModelException(e);
        }

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            setMaxRows(scan, maxRows);
        }


        final HTableInterface hTable = _tablePool.getTable(table.getName());
        try {
            final ResultScanner scanner = hTable.getScanner(scan);
            return new HBaseDataSet(columns, scanner, hTable);
        } catch (Exception e) {
            FileHelper.safeClose(hTable);
            throw new MetaModelException(e);
        }

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        Scan s = new Scan();
        s.addFamily(TEST_FAMILY);


        HTable table = new HTable(conf, TEST_TABLE);
        try {
          ResultScanner scanner = table.getScanner(s);
          try {
            for (Result r = scanner.next(); r != null; r = scanner.next()) {
              // do nothing
            }
          } catch (IOException e) {
          } finally {
            scanner.close();
          }
        } finally {
          table.close();
        }
        return null;

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  }


  @Override
  public int openScanner(ByteBuffer table, TScan scan) throws TIOError, TException {
    HTableInterface htable = getTable(table);
    ResultScanner resultScanner = null;
    try {
      resultScanner = htable.getScanner(scanFromThrift(scan));
    } catch (IOException e) {
      throw getTIOError(e);
    } finally {

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  }


  @Override
  public List<TResult> getScannerRows(int scannerId, int numRows) throws TIOError,
      TIllegalArgument, TException {
    ResultScanner scanner = getScanner(scannerId);
    if (scanner == null) {
      TIllegalArgument ex = new TIllegalArgument();
      ex.setMessage("Invalid scanner Id");
      throw ex;
    }


    try {
      return resultsFromHBase(scanner.next(numRows));
    } catch (IOException e) {
      throw getTIOError(e);
    }
  }

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  }


  @Override
  public void closeScanner(int scannerId) throws TIOError, TIllegalArgument, TException {
    LOG.debug("scannerClose: id=" + scannerId);
    ResultScanner scanner = getScanner(scannerId);
    if (scanner == null) {
      String message = "scanner ID is invalid";
      LOG.warn(message);
      TIllegalArgument ex = new TIllegalArgument();
      ex.setMessage("Invalid scanner Id");
      throw ex;
    }
    scanner.close();
    removeScanner(scannerId);
  }

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  @Override
  public List<TResult> getScannerResults(ByteBuffer table, TScan scan, int numRows)
      throws TIOError, TException {
    HTableInterface htable = getTable(table);
    List<TResult> results = null;
    ResultScanner scanner = null;
    try {
      scanner = htable.getScanner(scanFromThrift(scan));
      results = resultsFromHBase(scanner.next(numRows));
    } catch (IOException e) {
      throw getTIOError(e);
    } finally {
      if (scanner != null) {
        scanner.close();
      }
      closeTable(htable);
    }
    return results;
  }

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    Configuration c = new Configuration(this.conf);
    this.hbaseCluster = new MiniHBaseCluster(c, numMasters, numSlaves);
    // Don't leave here till we've done a successful scan of the .META.
    HTable t = new HTable(c, HConstants.META_TABLE_NAME);
    ResultScanner s = t.getScanner(new Scan());
    while (s.next() != null) {
      continue;
    }
    s.close();
    t.close();


    getHBaseAdmin(); // create immediately the hbaseAdmin
    LOG.info("Minicluster is up");
    return (MiniHBaseCluster)this.hbaseCluster;

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   */
  public void restartHBaseCluster(int servers) throws IOException, InterruptedException {
    this.hbaseCluster = new MiniHBaseCluster(this.conf, servers);
    // Don't leave here till we've done a successful scan of the .META.
    HTable t = new HTable(new Configuration(this.conf), HConstants.META_TABLE_NAME);
    ResultScanner s = t.getScanner(new Scan());
    while (s.next() != null) {
      // do nothing
    }
    LOG.info("HBase has been restarted");
    s.close();
    t.close();
  }

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   * @throws IOException
   */
  public HTable truncateTable(byte [] tableName) throws IOException {
    HTable table = new HTable(getConfiguration(), tableName);
    Scan scan = new Scan();
    ResultScanner resScan = table.getScanner(scan);
    for(Result res : resScan) {
      Delete del = new Delete(res.getRow());
      table.delete(del);
    }
    resScan = table.getScanner(scan);
    resScan.close();
    return table;
  }

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