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.

      scan.setCaching(caching);
    }
    scan.addFamily(HConstants.CATALOG_FAMILY);
    HTable metaTable = scanRoot?
      getRootHTable(catalogTracker): getMetaHTable(catalogTracker);
    ResultScanner scanner = metaTable.getScanner(scan);
    try {
      Result data;
      while((data = scanner.next()) != null) {
        if (data.isEmpty()) continue;
        // Break if visit returns false.
        if (!visitor.visit(data)) break;
      }
    } finally {
      scanner.close();
      metaTable.close();
    }
    return;
  }

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      }
    }


    public void scannerClose(int id) throws IOError, IllegalArgument {
      LOG.debug("scannerClose: id=" + id);
      ResultScanner scanner = getScanner(id);
      if (scanner == null) {
        String message = "scanner ID is invalid";
        LOG.warn(message);
        throw new IllegalArgument("scanner ID is invalid");
      }
      scanner.close();
      removeScanner(id);
    }

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    @Override
    public List<TRowResult> scannerGetList(int id,int nbRows)
        throws IllegalArgument, IOError {
      LOG.debug("scannerGetList: id=" + id);
      ResultScanner scanner = getScanner(id);
      if (null == scanner) {
        String message = "scanner ID is invalid";
        LOG.warn(message);
        throw new IllegalArgument("scanner ID is invalid");
      }


      Result [] results = null;
      try {
        results = scanner.next(nbRows);
        if (null == results) {
          return new ArrayList<TRowResult>();
        }
      } catch (IOException e) {
        LOG.warn(e.getMessage(), e);

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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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  /**
   * Return the number of rows in the given table.
   */
  public int countRows(final HTable table) throws IOException {
    Scan scan = new Scan();
    ResultScanner results = table.getScanner(scan);
    int count = 0;
    for (@SuppressWarnings("unused") Result res : results) {
      count++;
    }
    results.close();
    return count;
  }

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  public int countRows(final HTable table, final byte[]... families) throws IOException {
    Scan scan = new Scan();
    for (byte[] family: families) {
      scan.addFamily(family);
    }
    ResultScanner results = table.getScanner(scan);
    int count = 0;
    for (@SuppressWarnings("unused") Result res : results) {
      count++;
    }
    results.close();
    return count;
  }

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  /**
   * Return an md5 digest of the entire contents of a table.
   */
  public String checksumRows(final HTable table) throws Exception {
    Scan scan = new Scan();
    ResultScanner results = table.getScanner(scan);
    MessageDigest digest = MessageDigest.getInstance("MD5");
    for (Result res : results) {
      digest.update(res.getRow());
    }
    results.close();
    return digest.toString();
  }

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   */
  public List<byte[]> getMetaTableRows() throws IOException {
    // TODO: Redo using MetaReader class
    HTable t = new HTable(new Configuration(this.conf), HConstants.META_TABLE_NAME);
    List<byte[]> rows = new ArrayList<byte[]>();
    ResultScanner s = t.getScanner(new Scan());
    for (Result result : s) {
      LOG.info("getMetaTableRows: row -> " +
        Bytes.toStringBinary(result.getRow()));
      rows.add(result.getRow());
    }
    s.close();
    t.close();
    return rows;
  }

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