示例#1
0
  public void merge(QuantileDigest other) {
    rescaleToCommonLandmark(this, other);

    // 2. merge other into this (don't modify other)
    root = merge(root, other.root);

    max = Math.max(max, other.max);
    min = Math.min(min, other.min);

    // 3. compress to remove unnecessary nodes
    compress();
  }
示例#2
0
  /** Adds a value to this digest. The value must be {@code >= 0} */
  public void add(long value, long count) {
    checkArgument(count > 0, "count must be > 0");

    long nowInSeconds = TimeUnit.NANOSECONDS.toSeconds(ticker.read());

    int maxExpectedNodeCount = 3 * calculateCompressionFactor();
    if (nowInSeconds - landmarkInSeconds >= RESCALE_THRESHOLD_SECONDS) {
      rescale(nowInSeconds);
      compress(); // need to compress to get rid of nodes that may have decayed to ~ 0
    } else if (nonZeroNodeCount > MAX_SIZE_FACTOR * maxExpectedNodeCount && compressAutomatically) {
      // The size (number of non-zero nodes) of the digest is at most 3 * compression factor
      // If we're over MAX_SIZE_FACTOR of the expected size, compress
      // Note: we don't compress as soon as we go over expectedNodeCount to avoid unnecessarily
      // running a compression for every new added element when we're close to boundary
      compress();
    }

    double weight = weight(TimeUnit.NANOSECONDS.toSeconds(ticker.read())) * count;

    max = Math.max(max, value);
    min = Math.min(min, value);

    insert(longToBits(value), weight);
  }