Java Cell.getValueOffset方法代碼示例

import org.apache.hadoop.hbase.Cell; //導入方法依賴的package包/類
@Override
public boolean preWALWrite(ObserverContext<? extends WALCoprocessorEnvironment> env,
    HRegionInfo info, WALKey logKey, WALEdit logEdit) throws IOException {
  boolean bypass = false;
  // check table name matches or not.
  if (!Bytes.equals(info.getTableName(), this.tableName)) {
    return bypass;
  }
  preWALWriteCalled = true;
  // here we're going to remove one keyvalue from the WALEdit, and add
  // another one to it.
  List<Cell> cells = logEdit.getCells();
  Cell deletedCell = null;
  for (Cell cell : cells) {
    // assume only one kv from the WALEdit matches.
    byte[] family = cell.getFamily();
    byte[] qulifier = cell.getQualifier();

    if (Arrays.equals(family, ignoredFamily) &&
        Arrays.equals(qulifier, ignoredQualifier)) {
      LOG.debug("Found the KeyValue from WALEdit which should be ignored.");
      deletedCell = cell;
    }
    if (Arrays.equals(family, changedFamily) &&
        Arrays.equals(qulifier, changedQualifier)) {
      LOG.debug("Found the KeyValue from WALEdit which should be changed.");
      cell.getValueArray()[cell.getValueOffset()] += 1;
    }
  }
  if (null != row) {
    cells.add(new KeyValue(row, addedFamily, addedQualifier));
  }
  if (deletedCell != null) {
    LOG.debug("About to delete a KeyValue from WALEdit.");
    cells.remove(deletedCell);
  }
  return bypass;
}
 

import org.apache.hadoop.hbase.Cell; //導入方法依賴的package包/類
/**
 * currently must do deep copy into new array
 */
@Override
public Cell getKeyValue() {
  Cell cell = ptSearcher.current();
  if (cell == null) {
    return null;
  }
  return new ClonedPrefixTreeCell(cell.getRowArray(), cell.getRowOffset(), cell.getRowLength(),
      cell.getFamilyArray(), cell.getFamilyOffset(), cell.getFamilyLength(),
      cell.getQualifierArray(), cell.getQualifierOffset(), cell.getQualifierLength(),
      cell.getValueArray(), cell.getValueOffset(), cell.getValueLength(), cell.getTagsArray(),
      cell.getTagsOffset(), cell.getTagsLength(), cell.getTimestamp(), cell.getTypeByte(),
      cell.getSequenceId());
}
 

import org.apache.hadoop.hbase.Cell; //導入方法依賴的package包/類
/**
 * Add key/value to file. Keys must be added in an order that agrees with the
 * Comparator passed on construction.
 *
 * @param cell Cell to add. Cannot be empty nor null.
 * @throws IOException
 */
@Override
public void append(final Cell cell) throws IOException {
  byte[] value = cell.getValueArray();
  int voffset = cell.getValueOffset();
  int vlength = cell.getValueLength();
  // checkKey uses comparator to check we are writing in order.
  boolean dupKey = checkKey(cell);
  checkValue(value, voffset, vlength);
  if (!dupKey) {
    checkBlockBoundary();
  }

  if (!fsBlockWriter.isWriting()) {
    newBlock();
  }

  synchronized (HFileWriterV2.class) {
    if (WARN_CELL_WITH_TAGS && getFileContext().isIncludesTags()) {
      LOG.warn("A minimum HFile version of " + HFile.MIN_FORMAT_VERSION_WITH_TAGS
        + " is required to support cell attributes/tags. Consider setting "
        + HFile.FORMAT_VERSION_KEY + " accordingly.");
      WARN_CELL_WITH_TAGS = false;
    }
  }

  fsBlockWriter.write(cell);

  totalKeyLength += CellUtil.estimatedSerializedSizeOfKey(cell);
  totalValueLength += vlength;

  // Are we the first key in this block?
  if (firstCellInBlock == null) {
    // If cell is big, block will be closed and this firstCellInBlock reference will only last
    // a short while.
    firstCellInBlock = cell;
  }

  // TODO: What if cell is 10MB and we write infrequently?  We'll hold on to the cell here
  // indefinetly?
  lastCell = cell;
  entryCount++;
  this.maxMemstoreTS = Math.max(this.maxMemstoreTS, cell.getSequenceId());
}