Example #1
0
  /**
   * Returns the unique metric values for each column.
   *
   * <p>The original unique values cannot be used because after aggregation, we almost certainly
   * have new values to encode that were not present in the original data set.
   */
  private Map<String, Set<Object>> computeUniqueMetricValues() {
    Map<String, Set<Object>> uniqueMetricValues = new HashMap<String, Set<Object>>();

    Iterator<StarTreeTableRow> tableIterator = starTreeBuilder.getTable().getAllCombinations();
    while (tableIterator.hasNext()) {
      StarTreeTableRow row = tableIterator.next();

      for (int i = 0; i < schema.getMetricNames().size(); i++) {
        String metricName = schema.getMetricNames().get(i);
        Object metricValue = row.getMetrics().get(i);
        Set<Object> uniqueValues = uniqueMetricValues.get(metricName);
        if (uniqueValues == null) {
          uniqueValues = new HashSet<Object>();
          uniqueMetricValues.put(metricName, uniqueValues);
        }
        uniqueValues.add(metricValue);
      }
    }

    return uniqueMetricValues;
  }
Example #2
0
  /** Converts a raw row into its (possibly partial) dimension and complete metric values */
  private StarTreeTableRow extractValues(GenericRow row) {
    List<Integer> dimensions = new ArrayList<Integer>();
    for (String dimensionName : schema.getDimensionNames()) {
      Integer valueId;
      if (schema.getFieldSpecFor(dimensionName).isSingleValueField()
          && !starTreeIndexSpec.getExcludedDimensions().contains(dimensionName)) {
        Object value = row.getValue(dimensionName);
        valueId = dictionaryCreatorMap.get(dimensionName).indexOfSV(value);
      } else {
        // Multi-value fields are not supported - always ALL
        valueId = V1Constants.STARTREE_ALL_NUMBER.intValue();
      }

      dimensions.add(valueId);
    }

    List<Number> metrics = new ArrayList<Number>(schema.getMetricNames().size());
    for (MetricFieldSpec metricFieldSpec : schema.getMetricFieldSpecs()) {
      Object value = row.getValue(metricFieldSpec.getName());
      switch (metricFieldSpec.getDataType()) {
        case INT:
          metrics.add((Integer) value);
          break;
        case LONG:
          metrics.add((Long) value);
          break;
        case DOUBLE:
          metrics.add((Double) value);
          break;
        case FLOAT:
          metrics.add((Float) value);
          break;
        default:
          throw new IllegalStateException("Unsupported data type " + metricFieldSpec.getDataType());
      }
    }

    return new StarTreeTableRow(dimensions, metrics);
  }
Example #3
0
  @Override
  public void init(
      SegmentGeneratorConfig config,
      Map<String, ColumnIndexCreationInfo> columnInfo,
      Schema schema,
      int totalDocs,
      File outDir)
      throws Exception {
    // Member variables
    this.config = config;
    this.columnInfo = columnInfo;
    this.schema = schema;
    this.outDir = outDir;
    this.starTreeDimensionDictionary = new HashMap<String, Integer>();
    this.starTreeMetricDictionary = new HashMap<String, Integer>();

    // Dictionaries (will go in root segment)
    initializeAndBuildDictionaries(schema, columnInfo, outDir);

    // Compute dimension dictionary
    for (int i = 0; i < schema.getDimensionNames().size(); i++) {
      starTreeDimensionDictionary.put(schema.getDimensionNames().get(i), i);
    }
    LOG.info("StarTree dimension dictionary: {}", starTreeDimensionDictionary);

    // Compute the metric dictionary
    for (int i = 0; i < schema.getMetricNames().size(); i++) {
      starTreeMetricDictionary.put(schema.getMetricNames().get(i), i);
    }
    LOG.info("StarTree metric dictionary: {}", starTreeDimensionDictionary);

    // Compute StarTree split order
    splitOrder = computeSplitOrder(columnInfo);
    LOG.info("Computed split order {}", splitOrder);
    List<Integer> splitOrderIndexes = new ArrayList<Integer>();
    for (String dimensionName : splitOrder) {
      Integer dimensionId = starTreeDimensionDictionary.get(dimensionName);
      splitOrderIndexes.add(dimensionId);
    }
    Collections.reverse(splitOrderIndexes);

    // StarTree builder / table
    StarTreeTable table = new LinkedListStarTreeTable(); // TODO: ByteBuffer-based
    StarTreeDocumentIdMap documentIdMap =
        new HashMapStarTreeDocumentIdMap(); // TODO: ByteBuffer-based
    starTreeBuilder.init(
        splitOrderIndexes, starTreeIndexSpec.getMaxLeafRecords(), table, documentIdMap);

    // Build the StarTree structure and table
    LOG.info("Building StarTree table...");
    int count = 0;
    long startMillis = System.currentTimeMillis();
    recordReader.rewind();
    while (recordReader.hasNext()) {
      GenericRow row = recordReader.next();
      StarTreeTableRow starTreeTableRow = extractValues(row);
      starTreeBuilder.append(starTreeTableRow);
      count++;
    }
    long endMillis = System.currentTimeMillis();
    LOG.info(
        "Finished building StarTree table ({} documents, took {} ms)",
        count,
        endMillis - startMillis);

    LOG.info("Building StarTree (computing aggregates)...");
    startMillis = System.currentTimeMillis();
    starTreeBuilder.build();
    endMillis = System.currentTimeMillis();
    LOG.info("Finished building StarTree, took {} ms", endMillis - startMillis);

    // Re-compute the unique values for metrics including aggregates to allow for dictionary
    // encoding
    LOG.info("Re-computing unique metric values for dictionary encoding...");
    startMillis = System.currentTimeMillis();
    Map<String, Set<Object>> uniqueMetricValues = computeUniqueMetricValues();
    resetMetricDictionaries(uniqueMetricValues);
    endMillis = System.currentTimeMillis();
    LOG.info("Finished re-computing unique metric values (took {} ms)", endMillis - startMillis);

    // StarTree directory
    starTreeDir = new File(outDir, V1Constants.STARTREE_DIR);
    if (!starTreeDir.mkdir()) {
      throw new RuntimeException(
          "Could not create star tree directory " + starTreeDir.getAbsolutePath());
    }

    // For each column, build its dictionary and initialize a forwards and an inverted index for raw
    // / agg segment
    int totalAggDocs = starTreeBuilder.getTotalAggregateDocumentCount();
    int totalRawDocs = starTreeBuilder.getTotalRawDocumentCount();
    for (final String column : dictionaryCreatorMap.keySet()) {
      ColumnIndexCreationInfo indexCreationInfo = columnInfo.get(column);

      Object[] uniqueValues = indexCreationInfo.getSortedUniqueElementsArray();
      if (schema.getMetricNames().contains(column)) {
        // Use the unique values including the new aggregate values
        uniqueValues = uniqueMetricValues.get(column).toArray();
      }

      if (schema.getFieldSpecFor(column).isSingleValueField()) {
        if (indexCreationInfo.isSorted()) {
          forwardIndexCreatorMap.put(
              column,
              new SingleValueSortedForwardIndexCreator(
                  outDir, uniqueValues.length, schema.getFieldSpecFor(column)));
          aggregateForwardIndexCreatorMap.put(
              column,
              new SingleValueSortedForwardIndexCreator(
                  starTreeDir, uniqueValues.length, schema.getFieldSpecFor(column)));
        } else {
          forwardIndexCreatorMap.put(
              column,
              new SingleValueUnsortedForwardIndexCreator(
                  schema.getFieldSpecFor(column),
                  outDir,
                  uniqueValues.length,
                  totalRawDocs,
                  indexCreationInfo.getTotalNumberOfEntries(),
                  indexCreationInfo.hasNulls()));
          aggregateForwardIndexCreatorMap.put(
              column,
              new SingleValueUnsortedForwardIndexCreator(
                  schema.getFieldSpecFor(column),
                  starTreeDir,
                  indexCreationInfo.getSortedUniqueElementsArray().length,
                  totalAggDocs,
                  indexCreationInfo.getTotalNumberOfEntries(),
                  indexCreationInfo.hasNulls()));
        }
      } else {
        forwardIndexCreatorMap.put(
            column,
            new MultiValueUnsortedForwardIndexCreator(
                schema.getFieldSpecFor(column),
                outDir,
                uniqueValues.length,
                totalRawDocs,
                indexCreationInfo.getTotalNumberOfEntries(),
                indexCreationInfo.hasNulls()));
        aggregateForwardIndexCreatorMap.put(
            column,
            new MultiValueUnsortedForwardIndexCreator(
                schema.getFieldSpecFor(column),
                starTreeDir,
                uniqueValues.length,
                totalAggDocs,
                indexCreationInfo.getTotalNumberOfEntries(),
                indexCreationInfo.hasNulls()));
      }

      if (config.createInvertedIndexEnabled()) {
        invertedIndexCreatorMap.put(
            column,
            new BitmapInvertedIndexCreator(
                outDir,
                indexCreationInfo.getSortedUniqueElementsArray().length,
                schema.getFieldSpecFor(column)));
        aggregateInvertedIndexCreatorMap.put(
            column,
            new BitmapInvertedIndexCreator(
                starTreeDir,
                indexCreationInfo.getSortedUniqueElementsArray().length,
                schema.getFieldSpecFor(column)));
      }
    }
  }