Examples of org.apache.hadoop.hbase.KeyValue$MetaComparator

org.apache.hadoop.hbase.KeyValue
A {@link KVComparator} for .META. catalog table{@link KeyValue}s.

          matches = true;
        } else if (result.size() > 0 && result.get(0).getValue().length == 0 &&
            valueIsNull) {
          matches = true;
        } else if (result.size() == 1 && !valueIsNull) {
          KeyValue kv = result.get(0);
          int compareResult = comparator.compareTo(kv.getBuffer(),
              kv.getValueOffset(), kv.getValueLength());
          switch (compareOp) {
          case LESS:
            matches = compareResult <= 0;
            break;
          case LESS_OR_EQUAL:

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    byte[] row = r.getRegionName();
    Integer lid = meta.obtainRowLock(row);
    try {
      final long now = EnvironmentEdgeManager.currentTimeMillis();
      final List<KeyValue> edits = new ArrayList<KeyValue>(2);
      edits.add(new KeyValue(row, HConstants.CATALOG_FAMILY,
        HConstants.REGIONINFO_QUALIFIER, now,
        Writables.getBytes(r.getRegionInfo())));
      // Set into the root table the version of the meta table.
      edits.add(new KeyValue(row, HConstants.CATALOG_FAMILY,
        HConstants.META_VERSION_QUALIFIER, now,
        Bytes.toBytes(HConstants.META_VERSION)));
      meta.put(HConstants.CATALOG_FAMILY, edits);
    } finally {
      meta.releaseRowLock(lid);

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          // Avoid as much copying as possible. Every byte is copied at most
          // once.
          // Would be nice if KeyValue had scatter/gather logic
          int idx = 0;
          for (KeyValue kv : family.getValue()) {
            KeyValue newKV;
            if (idx < results.size()
                && results.get(idx).matchingQualifier(kv.getBuffer(),
                    kv.getQualifierOffset(), kv.getQualifierLength())) {
              KeyValue oldKv = results.get(idx);
              // allocate an empty kv once
              newKV = new KeyValue(row.length, kv.getFamilyLength(),
                  kv.getQualifierLength(), now, KeyValue.Type.Put,
                  oldKv.getValueLength() + kv.getValueLength());
              // copy in the value
              System.arraycopy(oldKv.getBuffer(), oldKv.getValueOffset(),
                  newKV.getBuffer(), newKV.getValueOffset(),
                  oldKv.getValueLength());
              System.arraycopy(kv.getBuffer(), kv.getValueOffset(),
                  newKV.getBuffer(),
                  newKV.getValueOffset() + oldKv.getValueLength(),
                  kv.getValueLength());
              idx++;
            } else {
              // allocate an empty kv once
              newKV = new KeyValue(row.length, kv.getFamilyLength(),
                  kv.getQualifierLength(), now, KeyValue.Type.Put,
                  kv.getValueLength());
              // copy in the value
              System.arraycopy(kv.getBuffer(), kv.getValueOffset(),
                  newKV.getBuffer(), newKV.getValueOffset(),

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          int idx = 0;
          for (Map.Entry<byte [], Long> column : family.getValue().entrySet()) {
            long amount = column.getValue();
            if (idx < results.size() &&
                results.get(idx).matchingQualifier(column.getKey())) {
              KeyValue kv = results.get(idx);
              if(kv.getValueLength() == Bytes.SIZEOF_LONG) {
                amount += Bytes.toLong(kv.getBuffer(), kv.getValueOffset(), Bytes.SIZEOF_LONG);
              } else {
                // throw DoNotRetryIOException instead of IllegalArgumentException
                throw new DoNotRetryIOException(
                    "Attempted to increment field that isn't 64 bits wide");
              }
              idx++;
            }


            // Append new incremented KeyValue to list
            KeyValue newKV = new KeyValue(row, family.getKey(), column.getKey(),
                now, Bytes.toBytes(amount));
            kvs.add(newKV);


            // Append update to WAL
            if (writeToWAL) {

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        // we don't want to invoke coprocessor in this case; ICV is wrapped
        // in HRegionServer, so we leave getLastIncrement alone
        List<KeyValue> results = get(get, false);


        if (!results.isEmpty()) {
          KeyValue kv = results.get(0);
          if(kv.getValueLength() == Bytes.SIZEOF_LONG){
            byte [] buffer = kv.getBuffer();
            int valueOffset = kv.getValueOffset();
            result += Bytes.toLong(buffer, valueOffset, Bytes.SIZEOF_LONG);
          }
          else{
            wrongLength = true;
          }
        }
        if(!wrongLength){
          // build the KeyValue now:
          KeyValue newKv = new KeyValue(row, family,
            qualifier, EnvironmentEdgeManager.currentTimeMillis(),
            Bytes.toBytes(result));


          // now log it:
          if (writeToWAL) {

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            .withPath(fs, path)
            .withComparator(KeyValue.KEY_COMPARATOR)
            .create();
        // subtract 2 since numRows doesn't include boundary keys
        for (byte[] key : Bytes.iterateOnSplits(startKey, endKey, true, numRows-2)) {
          KeyValue kv = new KeyValue(key, family, qualifier, now, key);
          writer.append(kv);
        }
      } finally {
        if(writer != null)
          writer.close();

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            randomizer.nextInt(keyValues.size())).getTimestamp();
      } else {
        timestamp = randomizer.nextLong();
      }


      keyValues.add(new KeyValue(row, family, qualifier, timestamp, value));
    }


    // sort it and write to stream
    int totalSize = 0;
    Collections.sort(keyValues, KeyValue.COMPARATOR);

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      final ServerName sn)
  throws IOException {
    // TODO: Move to a utilities class.  More than one test case can make use
    // of this facility.
    List<KeyValue> kvs = new ArrayList<KeyValue>();
    kvs.add(new KeyValue(HConstants.EMPTY_BYTE_ARRAY,
      HConstants.CATALOG_FAMILY, HConstants.REGIONINFO_QUALIFIER,
      Writables.getBytes(hri)));
    kvs.add(new KeyValue(HConstants.EMPTY_BYTE_ARRAY,
      HConstants.CATALOG_FAMILY, HConstants.SERVER_QUALIFIER,
      Bytes.toBytes(sn.getHostAndPort())));
    kvs.add(new KeyValue(HConstants.EMPTY_BYTE_ARRAY,
      HConstants.CATALOG_FAMILY, HConstants.STARTCODE_QUALIFIER,
      Bytes.toBytes(sn.getStartcode())));
    return new Result(kvs);
  }

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   */
  protected void removeNonReplicableEdits(WALEdit edit) {
    NavigableMap<byte[], Integer> scopes = edit.getScopes();
    List<KeyValue> kvs = edit.getKeyValues();
    for (int i = edit.size()-1; i >= 0; i--) {
      KeyValue kv = kvs.get(i);
      // The scope will be null or empty if
      // there's nothing to replicate in that WALEdit
      if (scopes == null || !scopes.containsKey(kv.getFamily())) {
        kvs.remove(i);
      }
    }
  }

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   * @return number of different row keys
   */
  private int countDistinctRowKeys(WALEdit edit) {
    List<KeyValue> kvs = edit.getKeyValues();
    int distinctRowKeys = 1;
    KeyValue lastKV = kvs.get(0);
    for (int i = 0; i < edit.size(); i++) {
      if (!kvs.get(i).matchingRow(lastKV)) {
        distinctRowKeys++;
      }
    }

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