Java KeyValue.getFamilyLength方法代碼示例

import org.apache.hadoop.hbase.KeyValue; //導入方法依賴的package包/類
@Override
public void prePut(final ObserverContext<RegionCoprocessorEnvironment> e, final Put put,
    final WALEdit edit, final Durability durability) throws IOException {
  byte[] attribute = put.getAttribute("visibility");
  byte[] cf = null;
  List<Cell> updatedCells = new ArrayList<Cell>();
  if (attribute != null) {
    for (List<? extends Cell> edits : put.getFamilyCellMap().values()) {
      for (Cell cell : edits) {
        KeyValue kv = KeyValueUtil.ensureKeyValue(cell);
        if (cf == null) {
          cf = kv.getFamily();
        }
        Tag tag = new Tag(TAG_TYPE, attribute);
        List<Tag> tagList = new ArrayList<Tag>();
        tagList.add(tag);

        KeyValue newKV = new KeyValue(kv.getRow(), 0, kv.getRowLength(), kv.getFamily(), 0,
            kv.getFamilyLength(), kv.getQualifier(), 0, kv.getQualifierLength(),
            kv.getTimestamp(), KeyValue.Type.codeToType(kv.getType()), kv.getValue(), 0,
            kv.getValueLength(), tagList);
        ((List<Cell>) updatedCells).add(newKV);
      }
    }
    put.getFamilyCellMap().remove(cf);
    // Update the family map
    put.getFamilyCellMap().put(cf, updatedCells);
  }
}
 

import org.apache.hadoop.hbase.KeyValue; //導入方法依賴的package包/類
@Override
public void prePut(ObserverContext<RegionCoprocessorEnvironment> e, Put m, WALEdit edit,
    Durability durability) throws IOException {
  byte[] attribute = m.getAttribute(NON_VISIBILITY);
  byte[] cf = null;
  List<Cell> updatedCells = new ArrayList<Cell>();
  if (attribute != null) {
    for (List<? extends Cell> edits : m.getFamilyCellMap().values()) {
      for (Cell cell : edits) {
        KeyValue kv = KeyValueUtil.ensureKeyValue(cell);
        if (cf == null) {
          cf = kv.getFamily();
        }
        Tag tag = new Tag((byte) NON_VIS_TAG_TYPE, attribute);
        List<Tag> tagList = new ArrayList<Tag>();
        tagList.add(tag);
        tagList.addAll(kv.getTags());
        byte[] fromList = Tag.fromList(tagList);
        TagRewriteCell newcell = new TagRewriteCell(kv, fromList);
        KeyValue newKV = new KeyValue(kv.getRow(), 0, kv.getRowLength(), kv.getFamily(), 0,
            kv.getFamilyLength(), kv.getQualifier(), 0, kv.getQualifierLength(),
            kv.getTimestamp(), KeyValue.Type.codeToType(kv.getType()), kv.getValue(), 0,
            kv.getValueLength(), tagList);
        ((List<Cell>) updatedCells).add(newcell);
      }
    }
    m.getFamilyCellMap().remove(cf);
    // Update the family map
    m.getFamilyCellMap().put(cf, updatedCells);
  }
}
 

import org.apache.hadoop.hbase.KeyValue; //導入方法依賴的package包/類
private void updateMutationAddingTags(final Mutation m) {
  byte[] attribute = m.getAttribute("visibility");
  byte[] cf = null;
  List<Cell> updatedCells = new ArrayList<Cell>();
  if (attribute != null) {
    for (List<? extends Cell> edits : m.getFamilyCellMap().values()) {
      for (Cell cell : edits) {
        KeyValue kv = KeyValueUtil.ensureKeyValue(cell);
        if (cf == null) {
          cf = kv.getFamily();
        }
        Tag tag = new Tag((byte) 1, attribute);
        List<Tag> tagList = new ArrayList<Tag>();
        tagList.add(tag);

        KeyValue newKV = new KeyValue(kv.getRow(), 0, kv.getRowLength(), kv.getFamily(), 0,
            kv.getFamilyLength(), kv.getQualifier(), 0, kv.getQualifierLength(),
            kv.getTimestamp(), KeyValue.Type.codeToType(kv.getType()), kv.getValue(), 0,
            kv.getValueLength(), tagList);
        ((List<Cell>) updatedCells).add(newKV);
      }
    }
    m.getFamilyCellMap().remove(cf);
    // Update the family map
    m.getFamilyCellMap().put(cf, updatedCells);
  }
}
 

import org.apache.hadoop.hbase.KeyValue; //導入方法依賴的package包/類
/**
 * Check statistics for given HFile for different data block encoders.
 * @param scanner Of file which will be compressed.
 * @param kvLimit Maximal count of KeyValue which will be processed.
 * @throws IOException thrown if scanner is invalid
 */
public void checkStatistics(final KeyValueScanner scanner, final int kvLimit)
    throws IOException {
  scanner.seek(KeyValue.LOWESTKEY);

  KeyValue currentKV;

  byte[] previousKey = null;
  byte[] currentKey;

  DataBlockEncoding[] encodings = DataBlockEncoding.values();

  ByteArrayOutputStream uncompressedOutputStream =
      new ByteArrayOutputStream();

  int j = 0;
  while ((currentKV = KeyValueUtil.ensureKeyValue(scanner.next())) != null && j < kvLimit) {
    // Iterates through key/value pairs
    j++;
    currentKey = currentKV.getKey();
    if (previousKey != null) {
      for (int i = 0; i < previousKey.length && i < currentKey.length &&
          previousKey[i] == currentKey[i]; ++i) {
        totalKeyRedundancyLength++;
      }
    }

    uncompressedOutputStream.write(currentKV.getBuffer(),
        currentKV.getOffset(), currentKV.getLength());

    previousKey = currentKey;

    int kLen = currentKV.getKeyLength();
    int vLen = currentKV.getValueLength();
    int cfLen = currentKV.getFamilyLength(currentKV.getFamilyOffset());
    int restLen = currentKV.getLength() - kLen - vLen;

    totalKeyLength += kLen;
    totalValueLength += vLen;
    totalPrefixLength += restLen;
    totalCFLength += cfLen;
  }

  rawKVs = uncompressedOutputStream.toByteArray();
  boolean useTag = (currentKV.getTagsLength() > 0);
  for (DataBlockEncoding encoding : encodings) {
    if (encoding == DataBlockEncoding.NONE) {
      continue;
    }
    DataBlockEncoder d = encoding.getEncoder();
    HFileContext meta = new HFileContextBuilder()
                        .withCompression(Compression.Algorithm.NONE)
                        .withIncludesMvcc(includesMemstoreTS)
                        .withIncludesTags(useTag).build();
    codecs.add(new EncodedDataBlock(d, encoding, rawKVs, meta ));
  }
}