apache/hadoop · error · UnsupportedOperationException

not() is undefined for {}

Error message

not() is undefined for {}

What it means

Error "not() is undefined for {}" thrown in apache/hadoop.

Source

Thrown at hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/util/bloom/CountingBloomFilter.java:242

    for (int i = 0; i < nbHash; i++) {
      // find the bucket
      int wordNum = h[i] >> 4;          // div 16
      int bucketShift = (h[i] & 0x0f) << 2;  // (mod 16) * 4
      
      long bucketMask = 15L << bucketShift;
      long bucketValue = (buckets[wordNum] & bucketMask) >>> bucketShift;
      if (bucketValue < res) res = (int)bucketValue;
    }
    if (res != Integer.MAX_VALUE) {
      return res;
    } else {
      return 0;
    }
  }

  @Override
  public void not() {
    throw new UnsupportedOperationException("not() is undefined for "
        + this.getClass().getName());
  }

  @Override
  public void or(Filter filter) {
    if(filter == null
        || !(filter instanceof CountingBloomFilter)
        || filter.vectorSize != this.vectorSize
        || filter.nbHash != this.nbHash) {
      throw new IllegalArgumentException("filters cannot be or-ed");
    }

    CountingBloomFilter cbf = (CountingBloomFilter)filter;

    int sizeInWords = buckets2words(vectorSize);
    for(int i = 0; i < sizeInWords; i++) {
      this.buckets[i] |= cbf.buckets[i];
    }

View on GitHub (pinned to 2add963021)

Solutions

1. not() is only defined for CountingBloomFilter itself; it cannot be applied to {}. Do not call not() on this filter type.

When it happens

Trigger: Thrown at hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/util/bloom/CountingBloomFilter.java:242 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of apache/hadoop@2add963021 (2026-08-22). Data as JSON: /api/errors/0253876a71c38637. Report an issue: GitHub.