Package org.apache.lucene.codecs.bloom

Class DefaultBloomFilterFactory

java.lang.Object
org.apache.lucene.codecs.bloom.BloomFilterFactory
org.apache.lucene.codecs.bloom.DefaultBloomFilterFactory
public class DefaultBloomFilterFactory extends BloomFilterFactory
Default policy is to allocate a bitset with 10% saturation given a unique term per document. Bits are set via MurmurHash2 hashing function.
WARNING: This API is experimental and might change in incompatible ways in the next release.

  • Constructor Details

    • DefaultBloomFilterFactory

      public DefaultBloomFilterFactory()

  • Method Details

    • getSetForField

      public FuzzySet getSetForField(SegmentWriteState state, FieldInfo info)
      Specified by:
      getSetForField in class BloomFilterFactory
      Parameters:
      state - The content to be indexed
      info - the field requiring a BloomFilter
      Returns:
      An appropriately sized set or null if no BloomFiltering required

    • isSaturated

      public boolean isSaturated(FuzzySet bloomFilter, FieldInfo fieldInfo)
      Description copied from class: BloomFilterFactory
      Used to determine if the given filter has reached saturation and should be retired i.e. not saved any more
      Specified by:
      isSaturated in class BloomFilterFactory
      Parameters:
      bloomFilter - The bloomFilter being tested
      fieldInfo - The field with which this filter is associated
      Returns:
      true if the set has reached saturation and should be retired