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

org.apache.hadoop.hbase.client.Get
Used to perform Get operations on a single row.
To get everything for a row, instantiate a Get object with the row to get. To further define the scope of what to get, perform additional methods as outlined below.
To get all columns from specific families, execute {@link #addFamily(byte[]) addFamily}for each family to retrieve.
To get specific columns, execute {@link #addColumn(byte[],byte[]) addColumn}for each column to retrieve.
To only retrieve columns within a specific range of version timestamps, execute {@link #setTimeRange(long,long) setTimeRange}.
To only retrieve columns with a specific timestamp, execute {@link #setTimeStamp(long) setTimestamp}.
To limit the number of versions of each column to be returned, execute {@link #setMaxVersions(int) setMaxVersions}.
To add a filter, execute {@link #setFilter(Filter) setFilter}.

      undeployRegions(hi);
      return;
    }


    // get assignment info and hregioninfo from meta.
    Get get = new Get(hi.getRegionName());
    get.addColumn(HConstants.CATALOG_FAMILY, HConstants.REGIONINFO_QUALIFIER);
    get.addColumn(HConstants.CATALOG_FAMILY, HConstants.SERVER_QUALIFIER);
    get.addColumn(HConstants.CATALOG_FAMILY, HConstants.STARTCODE_QUALIFIER);
    Result r = meta.get(get);
    byte[] value = r.getValue(HConstants.CATALOG_FAMILY, HConstants.SERVER_QUALIFIER);
    byte[] startcodeBytes = r.getValue(HConstants.CATALOG_FAMILY, HConstants.STARTCODE_QUALIFIER);
    if (value == null || startcodeBytes == null) {
      errors.reportError("Unable to close region "

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      byte [] catalogRegionName, byte [] regionName)
  throws IOException {
    Result r = null;
    try {
      r = metaServer.get(catalogRegionName,
        new Get(regionName).
        addColumn(HConstants.CATALOG_FAMILY,
          HConstants.SERVER_QUALIFIER).
        addColumn(HConstants.CATALOG_FAMILY,
          HConstants.STARTCODE_QUALIFIER));
    } catch (java.net.SocketTimeoutException e) {

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   * @throws IOException
   */
  public static Pair<HRegionInfo, ServerName> getRegion(
      CatalogTracker catalogTracker, byte [] regionName)
  throws IOException {
    Get get = new Get(regionName);
    get.addFamily(HConstants.CATALOG_FAMILY);
    Result r = get(getCatalogHTable(catalogTracker, regionName), get);
    return (r == null || r.isEmpty())? null: parseCatalogResult(r);
  }

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                              byte[] family,
                              byte[] qualifier,
                              Map<ByteBuffer, ByteBuffer> attributes) throws IOError {
      try {
        HTable table = getTable(tableName);
        Get get = new Get(getBytes(row));
        addAttributes(get, attributes);
        if (qualifier == null || qualifier.length == 0) {
          get.addFamily(family);
        } else {
          get.addColumn(family, qualifier);
        }
        Result result = table.get(get);
        return ThriftUtilities.cellFromHBase(result.raw());
      } catch (IOException e) {
        LOG.warn(e.getMessage(), e);

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                              byte[] family,
        byte[] qualifier, int numVersions,
        Map<ByteBuffer, ByteBuffer> attributes) throws IOError {
      try {
        HTable table = getTable(tableName);
        Get get = new Get(getBytes(row));
        addAttributes(get, attributes);
        get.addColumn(family, qualifier);
        get.setMaxVersions(numVersions);
        Result result = table.get(get);
        return ThriftUtilities.cellFromHBase(result.raw());
      } catch (IOException e) {
        LOG.warn(e.getMessage(), e);
        throw new IOError(e.getMessage());

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                                   ByteBuffer row, byte [] family,
        byte [] qualifier, long timestamp, int numVersions,
        Map<ByteBuffer, ByteBuffer> attributes) throws IOError {
      try {
        HTable table = getTable(tableName);
        Get get = new Get(getBytes(row));
        addAttributes(get, attributes);
        get.addColumn(family, qualifier);
        get.setTimeRange(Long.MIN_VALUE, timestamp);
        get.setMaxVersions(numVersions);
        Result result = table.get(get);
        return ThriftUtilities.cellFromHBase(result.raw());
      } catch (IOException e) {
        LOG.warn(e.getMessage(), e);
        throw new IOError(e.getMessage());

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        ByteBuffer tableName, ByteBuffer row, List<ByteBuffer> columns,
        long timestamp, Map<ByteBuffer, ByteBuffer> attributes) throws IOError {
      try {
        HTable table = getTable(tableName);
        if (columns == null) {
          Get get = new Get(getBytes(row));
          addAttributes(get, attributes);
          get.setTimeRange(Long.MIN_VALUE, timestamp);
          Result result = table.get(get);
          return ThriftUtilities.rowResultFromHBase(result);
        }
        Get get = new Get(getBytes(row));
        addAttributes(get, attributes);
        for(ByteBuffer column : columns) {
          byte [][] famAndQf = KeyValue.parseColumn(getBytes(column));
          if (famAndQf.length == 1) {
              get.addFamily(famAndQf[0]);
          } else {
              get.addColumn(famAndQf[0], famAndQf[1]);
          }
        }
        get.setTimeRange(Long.MIN_VALUE, timestamp);
        Result result = table.get(get);
        return ThriftUtilities.rowResultFromHBase(result);
      } catch (IOException e) {
        LOG.warn(e.getMessage(), e);
        throw new IOError(e.getMessage());

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        HTable table = getTable(tableName);
        if (metrics != null) {
          metrics.incNumRowKeysInBatchGet(rows.size());
        }
        for (ByteBuffer row : rows) {
          Get get = new Get(getBytes(row));
          addAttributes(get, attributes);
          if (columns != null) {


            for(ByteBuffer column : columns) {
              byte [][] famAndQf = KeyValue.parseColumn(getBytes(column));
              if (famAndQf.length == 1) {
                get.addFamily(famAndQf[0]);
              } else {
                get.addColumn(famAndQf[0], famAndQf[1]);
              }
            }
          }
          get.setTimeRange(Long.MIN_VALUE, timestamp);
          gets.add(get);
        }
        Result[] result = table.get(gets);
        return ThriftUtilities.rowResultFromHBase(result);
      } catch (IOException e) {

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        KeyValue kv = KeyValueTestUtil.create(row, family, column, 0, valueString);
        p.add(kv);
      }
      region.put(p);


      Get get = new Get(row.getBytes());
      Filter filter = new ColumnCountGetFilter(100);
      get.setFilter(filter);
      Scan scan = new Scan(get);
      InternalScanner scanner = region.getScanner(scan);
      List<KeyValue> results = new ArrayList<KeyValue>();
      scanner.next(results);
      assertEquals(100, results.size());

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        KeyValue kv = KeyValueTestUtil.create(row, family, column, 0, valueString);
        p.add(kv);
      }
      region.put(p);


      Get get = new Get(row.getBytes());
      FilterList filterLst = new FilterList ();
      filterLst.addFilter( new ColumnCountGetFilter(100));
      get.setFilter(filterLst);
      Scan scan = new Scan(get);
      InternalScanner scanner = region.getScanner(scan);
      List<KeyValue> results = new ArrayList<KeyValue>();
      scanner.next(results);
      assertEquals(100, results.size());

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