Java Code Examples for org.apache.hadoop.hbase.client.Get

private void deleteAndWait(byte[] row, Table source, Table... targets)
throws Exception {
  Delete del = new Delete(row);
  source.delete(del);

  Get get = new Get(row);
  for (int i = 0; i < NB_RETRIES; i++) {
    if (i==NB_RETRIES-1) {
      fail("Waited too much time for del replication");
    }
    boolean removedFromAll = true;
    for (Table target : targets) {
      Result res = target.get(get);
      if (res.size() >= 1) {
        LOG.info("Row not deleted");
        removedFromAll = false;
        break;
      }
    }
    if (removedFromAll) {
      break;
    } else {
      Thread.sleep(SLEEP_TIME);
    }
  }
}
 

/**
 * Create a new protocol buffer GetRequest to get a row, all columns in a family.
 * If there is no such row, return the closest row before it.
 *
 * @param regionName the name of the region to get
 * @param row the row to get
 * @param family the column family to get
 * should return the immediate row before
 * @return a protocol buffer GetReuqest
 */
public static GetRequest buildGetRowOrBeforeRequest(
    final byte[] regionName, final byte[] row, final byte[] family) {
  GetRequest.Builder builder = GetRequest.newBuilder();
  RegionSpecifier region = buildRegionSpecifier(
    RegionSpecifierType.REGION_NAME, regionName);
  builder.setRegion(region);

  Column.Builder columnBuilder = Column.newBuilder();
  columnBuilder.setFamily(ByteStringer.wrap(family));
  ClientProtos.Get.Builder getBuilder =
    ClientProtos.Get.newBuilder();
  getBuilder.setRow(ByteStringer.wrap(row));
  getBuilder.addColumn(columnBuilder.build());
  getBuilder.setClosestRowBefore(true);
  builder.setGet(getBuilder.build());
  return builder.build();
}
 

@Override
public <T> List<T> get(TableName tableName, final List<Get> getList, final RowMapper<T>
        mapper) {
    assertAccessAvailable();
    return execute(tableName, new TableCallback<List<T>>() {
        @Override
        public List<T> doInTable(Table table) throws Throwable {
            Result[] result = table.get(getList);
            List<T> list = new ArrayList<>(result.length);
            for (int i = 0; i < result.length; i++) {
                T t = mapper.mapRow(result[i], i);
                list.add(t);
            }
            return list;
        }
    });
}
 

public void verifyNumericRows(HRegion region, final byte[] f, int startRow, int endRow,
    final boolean present) throws IOException {
  for (int i = startRow; i < endRow; i++) {
    String failMsg = "Failed verification of row :" + i;
    byte[] data = Bytes.toBytes(String.valueOf(i));
    Result result = region.get(new Get(data));

    boolean hasResult = result != null && !result.isEmpty();
    assertEquals(failMsg + result, present, hasResult);
    if (!present) continue;

    assertTrue(failMsg, result.containsColumn(f, null));
    assertEquals(failMsg, result.getColumnCells(f, null).size(), 1);
    Cell cell = result.getColumnLatestCell(f, null);
    assertTrue(failMsg,
      Bytes.equals(data, 0, data.length, cell.getValueArray(), cell.getValueOffset(),
        cell.getValueLength()));
  }
}
 

protected Get createGet(long keyToRead) throws IOException {
  Get get = new Get(dataGenerator.getDeterministicUniqueKey(keyToRead));
  String cfsString = "";
  byte[][] columnFamilies = dataGenerator.getColumnFamilies();
  for (byte[] cf : columnFamilies) {
    get.addFamily(cf);
    if (verbose) {
      if (cfsString.length() > 0) {
        cfsString += ", ";
      }
      cfsString += "[" + Bytes.toStringBinary(cf) + "]";
    }
  }
  get = dataGenerator.beforeGet(keyToRead, get);
  if (regionReplicaId > 0) {
    get.setReplicaId(regionReplicaId);
    get.setConsistency(Consistency.TIMELINE);
  }
  if (verbose) {
    LOG.info("[" + readerId + "] " + "Querying key " + keyToRead + ", cfs " + cfsString);
  }
  return get;
}
 

@Override public Result next() throws IOException {
  if (rawTable == null) return null;
  if (localCache.isEmpty()) {
    // load cache by batch get
    int size = Math.min(rowkeyQueue.size(), LOCAL_CACHE_SIZE);
    List<Get> gets = new ArrayList<>(size);
    for (int i = 0; i < size; i++) {
      gets.add(new Get(rowkeyQueue.poll()));
    }
    Result[] results = rawTable.get(gets);
    for (Result res : results) {
      localCache.add(res);
    }
  }
  if (localCache.isEmpty()) {
    // still empty, no more result, set rawTable to null
    rawTable.close();
    rawTable = null;
    return null;
  }
  return localCache.poll();
}
 

/**
 * Returns the HRegionLocation from meta for the given region
 * @param connection connection we're using
 * @param regionName region we're looking for
 * @return HRegionLocation for the given region
 * @throws IOException
 */
public static HRegionLocation getRegionLocation(Connection connection,
                                                byte[] regionName) throws IOException {
  byte[] row = regionName;
  HRegionInfo parsedInfo = null;
  try {
    parsedInfo = parseRegionInfoFromRegionName(regionName);
    row = getMetaKeyForRegion(parsedInfo);
  } catch (Exception parseEx) {
    // Ignore. This is used with tableName passed as regionName.
  }
  Get get = new Get(row);
  get.addFamily(HConstants.CATALOG_FAMILY);
  Result r = get(getMetaHTable(connection), get);
  RegionLocations locations = getRegionLocations(r);
  return locations == null
    ? null
    : locations.getRegionLocation(parsedInfo == null ? 0 : parsedInfo.getReplicaId());
}
 

/**
 * Test the case where the secondary region replica is not in reads enabled state because it is
 * waiting for a flush or region open marker from primary region. Replaying CANNOT_FLUSH
 * flush marker entry should restore the reads enabled status in the region and allow the reads
 * to continue.
 */
@Test
public void testReplayingFlushRequestRestoresReadsEnabledState() throws IOException {
  disableReads(secondaryRegion);

  // Test case 1: Test that replaying CANNOT_FLUSH request marker assuming this came from
  // triggered flush restores readsEnabled
  primaryRegion.flushcache(true, true);
  reader = createWALReaderForPrimary();
  while (true) {
    WAL.Entry entry = reader.next();
    if (entry == null) {
      break;
    }
    FlushDescriptor flush = WALEdit.getFlushDescriptor(entry.getEdit().getCells().get(0));
    if (flush != null) {
      secondaryRegion.replayWALFlushMarker(flush, entry.getKey().getLogSeqNum());
    }
  }

  // now reads should be enabled
  secondaryRegion.get(new Get(Bytes.toBytes(0)));
}
 

private void wait(byte[] row, Table target, boolean isDeleted)
    throws Exception {
  Get get = new Get(row);
  for (int i = 0; i < NB_RETRIES; i++) {
    if (i == NB_RETRIES - 1) {
      fail("Waited too much time for replication. Row:" + Bytes.toString(row)
          + ". IsDeleteReplication:" + isDeleted);
    }
    Result res = target.get(get);
    boolean sleep = isDeleted ? res.size() > 0 : res.size() == 0;
    if (sleep) {
      LOG.info("Waiting for more time for replication. Row:"
          + Bytes.toString(row) + ". IsDeleteReplication:" + isDeleted);
      Thread.sleep(SLEEP_TIME);
    } else {
      if (!isDeleted) {
        assertArrayEquals(res.value(), row);
      }
      LOG.info("Obtained row:"
          + Bytes.toString(row) + ". IsDeleteReplication:" + isDeleted);
      break;
    }
  }
}
 

private void checkWithWait(byte[] row, int count, Table table) throws Exception {
  Get get = new Get(row);
  for (int i = 0; i < NB_RETRIES; i++) {
    if (i == NB_RETRIES - 1) {
      fail("Waited too much time while getting the row.");
    }
    boolean rowReplicated = false;
    Result res = table.get(get);
    if (res.size() >= 1) {
      LOG.info("Row is replicated");
      rowReplicated = true;
      assertEquals("Table '" + table + "' did not have the expected number of  results.",
          count, res.size());
      break;
    }
    if (rowReplicated) {
      break;
    } else {
      Thread.sleep(SLEEP_TIME);
    }
  }
}
 

@Test (timeout=180000)
public void testNamespaceUserGrant() throws Exception {
  AccessTestAction getAction = new AccessTestAction() {
    @Override
    public Object run() throws Exception {
      try(Connection conn = ConnectionFactory.createConnection(conf);
          Table t = conn.getTable(TEST_TABLE);) {
        return t.get(new Get(TEST_ROW));
      }
    }
  };

  String namespace = TEST_TABLE.getNamespaceAsString();

  // Grant namespace READ to USER_NONE, this should supersede any table permissions
  grantOnNamespace(TEST_UTIL, USER_NONE.getShortName(), namespace, Permission.Action.READ);
  // Now USER_NONE should be able to read
  verifyAllowed(getAction, USER_NONE);

  // Revoke namespace READ to USER_NONE
  revokeFromNamespace(TEST_UTIL, USER_NONE.getShortName(), namespace, Permission.Action.READ);
  verifyDenied(getAction, USER_NONE);
}
 

public void verifyNumericRows(Table table, final byte[] f, int startRow, int endRow,
    int replicaId)
    throws IOException {
  for (int i = startRow; i < endRow; i++) {
    String failMsg = "Failed verification of row :" + i;
    byte[] data = Bytes.toBytes(String.valueOf(i));
    Get get = new Get(data);
    get.setReplicaId(replicaId);
    get.setConsistency(Consistency.TIMELINE);
    Result result = table.get(get);
    assertTrue(failMsg, result.containsColumn(f, null));
    assertEquals(failMsg, result.getColumnCells(f, null).size(), 1);
    Cell cell = result.getColumnLatestCell(f, null);
    assertTrue(failMsg,
      Bytes.equals(data, 0, data.length, cell.getValueArray(), cell.getValueOffset(),
        cell.getValueLength()));
  }
}
 

public static void blockUntilRegionIsOpened(Configuration conf, long timeout, HRegionInfo hri)
    throws IOException, InterruptedException {
  log("blocking until region is opened for reading:" + hri.getRegionNameAsString());
  long start = System.currentTimeMillis();
  try (Connection conn = ConnectionFactory.createConnection(conf);
      Table table = conn.getTable(hri.getTable())) {
    byte[] row = hri.getStartKey();
    // Check for null/empty row. If we find one, use a key that is likely to be in first region.
    if (row == null || row.length <= 0) row = new byte[] { '0' };
    Get get = new Get(row);
    while (System.currentTimeMillis() - start < timeout) {
      try {
        table.get(get);
        break;
      } catch (IOException ex) {
        // wait some more
      }
      Threads.sleep(10);
    }
  }
}
 

/**
 * Gets a Table for this table, does the get and closes the Table
 */
public Result doGet(final Get get) {
    Result result;
    final Table tableInterface = getTable();
    try {
        result = doGet(tableInterface, get);
    } finally {
        closeTable(tableInterface);
    }
    return result;
}
 

/**
 * Test merge tool.
 * @throws Exception
 */
public void testMergeTool() throws Exception {
  // First verify we can read the rows from the source regions and that they
  // contain the right data.
  for (int i = 0; i < regions.length; i++) {
    for (int j = 0; j < rows[i].length; j++) {
      Get get = new Get(rows[i][j]);
      get.addFamily(FAMILY);
      Result result = regions[i].get(get);
      byte [] bytes =  CellUtil.cloneValue(result.rawCells()[0]);
      assertNotNull(bytes);
      assertTrue(Bytes.equals(bytes, rows[i][j]));
    }
    // Close the region and delete the log
    HRegion.closeHRegion(regions[i]);
  }
  WAL log = wals.getWAL(new byte[]{});
   // Merge Region 0 and Region 1
  HRegion merged = mergeAndVerify("merging regions 0 and 1 ",
    this.sourceRegions[0].getRegionNameAsString(),
    this.sourceRegions[1].getRegionNameAsString(), log, 2);

  // Merge the result of merging regions 0 and 1 with region 2
  merged = mergeAndVerify("merging regions 0+1 and 2",
    merged.getRegionInfo().getRegionNameAsString(),
    this.sourceRegions[2].getRegionNameAsString(), log, 3);

  // Merge the result of merging regions 0, 1 and 2 with region 3
  merged = mergeAndVerify("merging regions 0+1+2 and 3",
    merged.getRegionInfo().getRegionNameAsString(),
    this.sourceRegions[3].getRegionNameAsString(), log, 4);

  // Merge the result of merging regions 0, 1, 2 and 3 with region 4
  merged = mergeAndVerify("merging regions 0+1+2+3 and 4",
    merged.getRegionInfo().getRegionNameAsString(),
    this.sourceRegions[4].getRegionNameAsString(), log, rows.length);
}
 

/**
 * Usecase:
 *
 *  - create a row with 1M cells, 10 bytes in each
 *  - flush & run major compaction
 *  - try to Get whole row.
 *
 *  OOME happened in StoreScanner.next(..).
 *
 * @throws IOException
 */
@Test(expected = RowTooBigException.class)
public void testScanAcrossManySmallColumns() throws IOException {
  byte[] row1 = Bytes.toBytes("row1");
  byte[] fam1 = Bytes.toBytes("fam1");

  HTableDescriptor htd = TEST_HTD;
  HColumnDescriptor hcd = new HColumnDescriptor(fam1);
  if (htd.hasFamily(hcd.getName())) {
    htd.modifyFamily(hcd);
  } else {
    htd.addFamily(hcd);
  }

  final HRegionInfo hri =
    new HRegionInfo(htd.getTableName(), HConstants.EMPTY_END_ROW,
      HConstants.EMPTY_END_ROW);
  Region region = HTU.createHRegion(hri, rootRegionDir, HTU.getConfiguration(), htd);
  try {
    // Add to memstore
    for (int i = 0; i < 10; i++) {
      Put put = new Put(row1);
      for (int j = 0; j < 10 * 10000; j++) {
        put.add(fam1, Bytes.toBytes("col_" + i + "_" + j), new byte[10]);
      }
      region.put(put);
      region.flush(true);
    }
    region.compact(true);

    Get get = new Get(row1);
    region.get(get);
  } finally {
    HBaseTestingUtility.closeRegion(region);
  }
}
 

public void store(Record record) throws Exception {
	table = conn.getTable(TableName.valueOf(nameSpaceName + ":" + tableName));
	Get get = new Get(Bytes.toBytes(record.getId().hashCode() + "" + record.getDate().hashCode()));
	if (table.get(get) == null) {

		Put put = new Put(Bytes.toBytes(record.getId().hashCode() + "" + record.getDate().hashCode())); // row
																										// key
		/*
		 * 7 结果公示类型——读取二级页面
		 */
		if (noticeType == 7) {
			ExtendCandidate candidate = getRequest.getData(record.getId());
			if (candidate != null) {
				put.addColumn(Bytes.toBytes(secondFamily), Bytes.toBytes("title"),
						Bytes.toBytes(candidate.getTitle()));
				put.addColumn(Bytes.toBytes(secondFamily), Bytes.toBytes("content"),
						Bytes.toBytes(candidate.getContent()));
			}
		}

		put.addColumn(Bytes.toBytes(firstFamily), Bytes.toBytes("name"), Bytes.toBytes(record.getName()));
		put.addColumn(Bytes.toBytes(firstFamily), Bytes.toBytes("type"), Bytes.toBytes(record.getTypeName()));
		put.addColumn(Bytes.toBytes(firstFamily), Bytes.toBytes("content"), Bytes.toBytes(record.getContent()));
		put.addColumn(Bytes.toBytes(firstFamily), Bytes.toBytes("date"), Bytes.toBytes(record.getDate()));
		put.addColumn(Bytes.toBytes(firstFamily), Bytes.toBytes("id"), Bytes.toBytes(record.getId()));

		table.put(put);
	}
}
 

/**
 * Dump out extra info around references if there are any. Helps debugging.
 * @return StringBuilder filled with references if any.
 * @throws IOException
 */
private StringBuilder dumpExtraInfoOnRefs(final BytesWritable key, final Context context,
    final List<byte []> refs)
throws IOException {
  StringBuilder refsSb = null;
  if (refs.isEmpty()) return refsSb;
  refsSb = new StringBuilder();
  String comma = "";
  // If a row is a reference but has no define, print the content of the row that has
  // this row as a 'prev'; it will help debug.  The missing row was written just before
  // the row we are dumping out here.
  TableName tn = getTableName(context.getConfiguration());
  try (Table t = this.connection.getTable(tn)) {
    for (byte [] ref : refs) {
      Result r = t.get(new Get(ref));
      List<Cell> cells = r.listCells();
      String ts = (cells != null && !cells.isEmpty())?
          new java.util.Date(cells.get(0).getTimestamp()).toString(): "";
      byte [] b = r.getValue(FAMILY_NAME, COLUMN_CLIENT);
      String jobStr = (b != null && b.length > 0)? Bytes.toString(b): "";
      b = r.getValue(FAMILY_NAME, COLUMN_COUNT);
      long count = (b != null && b.length > 0)? Bytes.toLong(b): -1;
      b = r.getValue(FAMILY_NAME, COLUMN_PREV);
      String refRegionLocation = "";
      String keyRegionLocation = "";
      if (b != null && b.length > 0) {
        try (RegionLocator rl = this.connection.getRegionLocator(tn)) {
          HRegionLocation hrl = rl.getRegionLocation(b);
          if (hrl != null) refRegionLocation = hrl.toString();
          // Key here probably has trailing zeros on it.
          hrl = rl.getRegionLocation(key.getBytes());
          if (hrl != null) keyRegionLocation = hrl.toString();
        }
      }
      LOG.error("Extras on ref without a def, ref=" + Bytes.toStringBinary(ref) +
        ", refPrevEqualsKey=" +
          (Bytes.compareTo(key.getBytes(), 0, key.getLength(), b, 0, b.length) == 0) +
          ", key=" + Bytes.toStringBinary(key.getBytes(), 0, key.getLength()) +
          ", ref row date=" + ts + ", jobStr=" + jobStr +
          ", ref row count=" + count +
          ", ref row regionLocation=" + refRegionLocation +
          ", key row regionLocation=" + keyRegionLocation);
      refsSb.append(comma);
      comma = ",";
      refsSb.append(Bytes.toStringBinary(ref));
    }
  }
  return refsSb;
}
 

/**
 * Do a small get/scan against one store. This is required because store
 * has no actual methods of querying itself, and relies on StoreScanner.
 */
public static List<Cell> getFromStoreFile(HStore store,
                                              byte [] row,
                                              NavigableSet<byte[]> columns
                                              ) throws IOException {
  Get get = new Get(row);
  Map<byte[], NavigableSet<byte[]>> s = get.getFamilyMap();
  s.put(store.getFamily().getName(), columns);

  return getFromStoreFile(store,get);
}
 

static void assertGet(final HRegion r, final byte[] family, final byte[] k) throws IOException {
  // Now I have k, get values out and assert they are as expected.
  Get get = new Get(k).addFamily(family).setMaxVersions();
  Cell[] results = r.get(get).rawCells();
  for (int j = 0; j < results.length; j++) {
    byte[] tmp = CellUtil.cloneValue(results[j]);
    // Row should be equal to value every time.
    assertTrue(Bytes.equals(k, tmp));
  }
}
 

/**
 * Test basic Get conversions.
 *
 * @throws IOException
 */
@Test
public void testGet() throws IOException {
  ClientProtos.Get.Builder getBuilder = ClientProtos.Get.newBuilder();
  getBuilder.setRow(ByteString.copyFromUtf8("row"));
  Column.Builder columnBuilder = Column.newBuilder();
  columnBuilder.setFamily(ByteString.copyFromUtf8("f1"));
  columnBuilder.addQualifier(ByteString.copyFromUtf8("c1"));
  columnBuilder.addQualifier(ByteString.copyFromUtf8("c2"));
  getBuilder.addColumn(columnBuilder.build());

  columnBuilder.clear();
  columnBuilder.setFamily(ByteString.copyFromUtf8("f2"));
  getBuilder.addColumn(columnBuilder.build());

  ClientProtos.Get proto = getBuilder.build();
  // default fields
  assertEquals(1, proto.getMaxVersions());
  assertEquals(true, proto.getCacheBlocks());

  // set the default value for equal comparison
  getBuilder = ClientProtos.Get.newBuilder(proto);
  getBuilder.setMaxVersions(1);
  getBuilder.setCacheBlocks(true);

  Get get = ProtobufUtil.toGet(proto);
  assertEquals(getBuilder.build(), ProtobufUtil.toGet(get));
}
 

private static void assertGet(final HRegion region, byte [] row, byte [] familiy,
    byte[] qualifier, byte[] value) throws IOException {
  // run a get and see if the value matches
  Get get = new Get(row);
  get.addColumn(familiy, qualifier);
  Result result = region.get(get);
  assertEquals(1, result.size());

  Cell kv = result.rawCells()[0];
  byte[] r = CellUtil.cloneValue(kv);
  assertTrue(Bytes.compareTo(r, value) == 0);
}
 

@Override public Result[] next(int nbRows) throws IOException {
  if (candidates == null || candidates.isEmpty()) return null;
  int size = Math.min(candidates.size(), nbRows);
  Result[] results = new Result[size];
  for (int i = 0; i < size; i++) {
    results[i] = rawTable.get(new Get(candidates.poll().id));
  }
  return results;
}
 

@Override
public void run() {
  for (int i = 0; i < numIncrements; i++) {
    try {
      Increment inc = new Increment(row);
      inc.addColumn(fam1, qual1, amount);
      inc.addColumn(fam1, qual2, amount*2);
      inc.addColumn(fam2, qual3, amount*3);
      inc.setDurability(Durability.ASYNC_WAL);
      region.increment(inc, HConstants.NO_NONCE, HConstants.NO_NONCE);

      // verify: Make sure we only see completed increments
      Get g = new Get(row);
      Result result = region.get(g);
      if (result != null) {
        assertTrue(result.getValue(fam1, qual1) != null);
        assertTrue(result.getValue(fam1, qual2) != null);
        assertEquals(Bytes.toLong(result.getValue(fam1, qual1))*2,
          Bytes.toLong(result.getValue(fam1, qual2)));
        assertTrue(result.getValue(fam2, qual3) != null);
        assertEquals(Bytes.toLong(result.getValue(fam1, qual1))*3,
          Bytes.toLong(result.getValue(fam2, qual3)));
      }
    } catch (IOException e) {
      e.printStackTrace();
    }
  }
}
 

/**
 * Create a protocol buffer GetRequest for a client Get
 *
 * @param regionName the name of the region to get
 * @param get the client Get
 * @return a protocol buffer GetRequest
 */
public static GetRequest buildGetRequest(final byte[] regionName,
    final Get get) throws IOException {
  GetRequest.Builder builder = GetRequest.newBuilder();
  RegionSpecifier region = buildRegionSpecifier(
    RegionSpecifierType.REGION_NAME, regionName);
  builder.setRegion(region);
  builder.setGet(ProtobufUtil.toGet(get));
  return builder.build();
}
 

public RowResultGenerator(final String tableName, final RowSpec rowspec,
    final Filter filter, final boolean cacheBlocks)
    throws IllegalArgumentException, IOException {
  Table table = RESTServlet.getInstance().getTable(tableName);
  try {
    Get get = new Get(rowspec.getRow());
    if (rowspec.hasColumns()) {
      for (byte[] col: rowspec.getColumns()) {
        byte[][] split = KeyValue.parseColumn(col);
        if (split.length == 1) {
          get.addFamily(split[0]);
        } else if (split.length == 2) {
          get.addColumn(split[0], split[1]);
        } else {
          throw new IllegalArgumentException("Invalid column specifier.");
        }
      }
    }
    get.setTimeRange(rowspec.getStartTime(), rowspec.getEndTime());
    get.setMaxVersions(rowspec.getMaxVersions());
    if (filter != null) {
      get.setFilter(filter);
    }
    get.setCacheBlocks(cacheBlocks);
    Result result = table.get(get);
    if (result != null && !result.isEmpty()) {
      valuesI = result.listCells().iterator();
    }
  } catch (DoNotRetryIOException | NeedUnmanagedConnectionException e) {
    // Warn here because Stargate will return 404 in the case if multiple
    // column families were specified but one did not exist -- currently
    // HBase will fail the whole Get.
    // Specifying multiple columns in a URI should be uncommon usage but
    // help to avoid confusion by leaving a record of what happened here in
    // the log.
    LOG.warn(StringUtils.stringifyException(e));
  } finally {
    table.close();
  }
}
 

@Override
public List<TRowResult> getRowsWithColumnsTs(ByteBuffer tableName,
                                             List<ByteBuffer> rows,
    List<ByteBuffer> columns, long timestamp,
    Map<ByteBuffer, ByteBuffer> attributes) throws IOError {

  Table table= null;
  try {
    List<Get> gets = new ArrayList<Get>(rows.size());
    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(0, timestamp);
      gets.add(get);
    }
    Result[] result = table.get(gets);
    return ThriftUtilities.rowResultFromHBase(result);
  } catch (IOException e) {
    LOG.warn(e.getMessage(), e);
    throw new IOError(Throwables.getStackTraceAsString(e));
  } finally{
    closeTable(table);
  }
}
 

@Override
public void preGetOp(ObserverContext<RegionCoprocessorEnvironment> e, Get get,
    List<Cell> results) throws IOException {
  if (!initialized) {
    throw new VisibilityControllerNotReadyException("VisibilityController not yet initialized");
  }
  // Nothing useful to do if authorization is not enabled
  if (!authorizationEnabled) {
    return;
  }
  Region region = e.getEnvironment().getRegion();
  Authorizations authorizations = null;
  try {
    authorizations = get.getAuthorizations();
  } catch (DeserializationException de) {
    throw new IOException(de);
  }
  if (authorizations == null) {
    // No Authorizations present for this scan/Get!
    // In case of system tables other than "labels" just scan with out visibility check and
    // filtering. Checking visibility labels for META and NAMESPACE table is not needed.
    TableName table = region.getRegionInfo().getTable();
    if (table.isSystemTable() && !table.equals(LABELS_TABLE_NAME)) {
      return;
    }
  }
  Filter visibilityLabelFilter = VisibilityUtils.createVisibilityLabelFilter(e.getEnvironment()
      .getRegion(), authorizations);
  if (visibilityLabelFilter != null) {
    Filter filter = get.getFilter();
    if (filter != null) {
      get.setFilter(new FilterList(filter, visibilityLabelFilter));
    } else {
      get.setFilter(visibilityLabelFilter);
    }
  }
}
 

@Deprecated
public Boolean[] exists(List<Get> gets) throws IOException {
  boolean[] results = existsAll(gets);
  Boolean[] objectResults = new Boolean[results.length];
  for (int i = 0; i < results.length; ++i) {
    objectResults[i] = results[i];
  }
  return objectResults;
}
 

private void fetchNamespaceQuotaState() {
  fetch("namespace", QuotaCache.this.namespaceQuotaCache, new Fetcher<String, QuotaState>() {
    @Override
    public Get makeGet(final Map.Entry<String, QuotaState> entry) {
      return QuotaUtil.makeGetForNamespaceQuotas(entry.getKey());
    }

    @Override
    public Map<String, QuotaState> fetchEntries(final List<Get> gets) throws IOException {
      return QuotaUtil.fetchNamespaceQuotas(rsServices.getConnection(), gets);
    }
  });
}
 

private void fetchTableQuotaState() {
  fetch("table", QuotaCache.this.tableQuotaCache, new Fetcher<TableName, QuotaState>() {
    @Override
    public Get makeGet(final Map.Entry<TableName, QuotaState> entry) {
      return QuotaUtil.makeGetForTableQuotas(entry.getKey());
    }

    @Override
    public Map<TableName, QuotaState> fetchEntries(final List<Get> gets) throws IOException {
      return QuotaUtil.fetchTableQuotas(rsServices.getConnection(), gets);
    }
  });
}
 

@Test
public void testMultiGet() throws Exception {
  ArrayList<Get> gets = new ArrayList<Get>();
  gets.add(new Get(ROW_1));
  gets.add(new Get(ROW_2));
  Result[] results = remoteTable.get(gets);
  assertNotNull(results);
  assertEquals(2, results.length);
  assertEquals(1, results[0].size());
  assertEquals(2, results[1].size());

  //Test Versions
  gets = new ArrayList<Get>();
  Get g = new Get(ROW_1);
  g.setMaxVersions(3);
  gets.add(g);
  gets.add(new Get(ROW_2));
  results = remoteTable.get(gets);
  assertNotNull(results);
  assertEquals(2, results.length);
  assertEquals(1, results[0].size());
  assertEquals(3, results[1].size());

  //404
  gets = new ArrayList<Get>();
  gets.add(new Get(Bytes.toBytes("RESALLYREALLYNOTTHERE")));
  results = remoteTable.get(gets);
  assertNotNull(results);
  assertEquals(0, results.length);

  gets = new ArrayList<Get>();
  gets.add(new Get(Bytes.toBytes("RESALLYREALLYNOTTHERE")));
  gets.add(new Get(ROW_1));
  gets.add(new Get(ROW_2));
  results = remoteTable.get(gets);
  assertNotNull(results);
  assertEquals(2, results.length);
}
 

private void assertGetRpc(HRegionInfo info, int value, boolean expect)
    throws IOException, ServiceException {
  byte[] row = Bytes.toBytes(String.valueOf(value));
  Get get = new Get(row);
  ClientProtos.GetRequest getReq = RequestConverter.buildGetRequest(info.getRegionName(), get);
  ClientProtos.GetResponse getResp =  getRS().getRSRpcServices().get(null, getReq);
  Result result = ProtobufUtil.toResult(getResp.getResult());
  if (expect) {
    Assert.assertArrayEquals(row, result.getValue(f, null));
  } else {
    result.isEmpty();
  }
}
 

public static Get makeGetForUserQuotas(final String user, final Iterable<TableName> tables,
    final Iterable<String> namespaces) {
  Get get = new Get(getUserRowKey(user));
  get.addColumn(QUOTA_FAMILY_INFO, QUOTA_QUALIFIER_SETTINGS);
  for (final TableName table : tables) {
    get.addColumn(QUOTA_FAMILY_INFO, getSettingsQualifierForUserTable(table));
  }
  for (final String ns : namespaces) {
    get.addColumn(QUOTA_FAMILY_INFO, getSettingsQualifierForUserNamespace(ns));
  }
  return get;
}
 

public static Map<String, QuotaState> fetchNamespaceQuotas(final Connection connection,
    final List<Get> gets) throws IOException {
  return fetchGlobalQuotas("namespace", connection, gets, new KeyFromRow<String>() {
    @Override
    public String getKeyFromRow(final byte[] row) {
      assert isNamespaceRowKey(row);
      return getNamespaceFromRowKey(row);
    }
  });
}
 

/** Use get to retrieve the HRegionInfo and validate it */
private void getRegionInfo() throws IOException {
  Get get = new Get(ROW_KEY);
  get.addColumn(HConstants.CATALOG_FAMILY, HConstants.REGIONINFO_QUALIFIER);
  Result result = region.get(get);
  byte [] bytes = result.value();
  validateRegionInfo(bytes);
}
 

private void checkRowAndDelete(Table t, byte[] row, int count) throws IOException {
  Get g = new Get(row);
  Result r = t.get(g);
  assertEquals(count, r.size());
  Delete d = new Delete(row);
  t.delete(d);
}
 

@Override
public void postGetOp(final ObserverContext<RegionCoprocessorEnvironment> c, final Get get,
    final List<Cell> results) {
  RegionCoprocessorEnvironment e = c.getEnvironment();
  assertNotNull(e);
  assertNotNull(e.getRegion());
  assertNotNull(get);
  assertNotNull(results);
  if (e.getRegion().getTableDesc().getTableName().equals(
      TestRegionObserverInterface.TEST_TABLE)) {
    boolean foundA = false;
    boolean foundB = false;
    boolean foundC = false;
    for (Cell kv: results) {
      if (CellUtil.matchingFamily(kv, TestRegionObserverInterface.A)) {
        foundA = true;
      }
      if (CellUtil.matchingFamily(kv, TestRegionObserverInterface.B)) {
        foundB = true;
      }
      if (CellUtil.matchingFamily(kv, TestRegionObserverInterface.C)) {
        foundC = true;
      }
    }
    assertTrue(foundA);
    assertTrue(foundB);
    assertTrue(foundC);
  }
  ctPostGet.incrementAndGet();
}
 

void updateDeleteLatestVersionTimeStamp(Cell cell, Get get, int count, byte[] byteNow)
    throws IOException {
  List<Cell> result = get(get, false);

  if (result.size() < count) {
    // Nothing to delete
    CellUtil.updateLatestStamp(cell, byteNow, 0);
    return;
  }
  if (result.size() > count) {
    throw new RuntimeException("Unexpected size: " + result.size());
  }
  Cell getCell = result.get(count - 1);
  CellUtil.setTimestamp(cell, getCell.getTimestamp());
}
 

public void verifyInvocationResults(Integer[] selectQualifiers,
    Integer[] expectedQualifiers) throws Exception {
  Get get = new Get(ROW_BYTES);
  for (int i = 0; i < selectQualifiers.length; i++) {
    get.addColumn(FAMILY_NAME_BYTES,
        Bytes.toBytes(QUALIFIER_PREFIX + selectQualifiers[i]));
  }

  get.setFilter(new InvocationRecordFilter());

  List<KeyValue> expectedValues = new ArrayList<KeyValue>();
  for (int i = 0; i < expectedQualifiers.length; i++) {
    expectedValues.add(new KeyValue(ROW_BYTES, FAMILY_NAME_BYTES, Bytes
        .toBytes(QUALIFIER_PREFIX + expectedQualifiers[i]),
        expectedQualifiers[i], Bytes.toBytes(VALUE_PREFIX
            + expectedQualifiers[i])));
  }

  Scan scan = new Scan(get);
  List<Cell> actualValues = new ArrayList<Cell>();
  List<Cell> temp = new ArrayList<Cell>();
  InternalScanner scanner = this.region.getScanner(scan);
  while (scanner.next(temp)) {
    actualValues.addAll(temp);
    temp.clear();
  }
  actualValues.addAll(temp);
  Assert.assertTrue("Actual values " + actualValues
      + " differ from the expected values:" + expectedValues,
      expectedValues.equals(actualValues));
}