Class DirectPostingsFormat

Wraps Lucene.Net.Codecs.Lucene41.Lucene41PostingsFormat format for on-disk storage, but then at read time loads and stores all terms & postings directly in RAM as byte[], int[].

WARNING: This is exceptionally RAM intensive: it makes no effort to compress the postings data, storing terms as separate byte[] and postings as separate int[], but as a result it gives substantial increase in search performance.

This postings format supports Lucene.Net.Index.TermsEnum.Ord and Lucene.Net.Index.TermsEnum.SeekExact(System.Int64).

Because this holds all term bytes as a single byte[], you cannot have more than 2.1GB worth of term bytes in a single segment.

Note

This API is experimental and might change in incompatible ways in the next release.

Inheritance

System.Object

Lucene.Net.Codecs.PostingsFormat

DirectPostingsFormat

Inherited Members

Lucene.Net.Codecs.PostingsFormat.EMPTY

Lucene.Net.Codecs.PostingsFormat.SetPostingsFormatFactory(Lucene.Net.Codecs.IPostingsFormatFactory)

Lucene.Net.Codecs.PostingsFormat.GetPostingsFormatFactory()

Lucene.Net.Codecs.PostingsFormat.Name

Lucene.Net.Codecs.PostingsFormat.ToString()

Lucene.Net.Codecs.PostingsFormat.ForName(System.String)

Lucene.Net.Codecs.PostingsFormat.AvailablePostingsFormats

System.Object.Equals(System.Object)

System.Object.Equals(System.Object, System.Object)

System.Object.GetHashCode()

System.Object.GetType()

System.Object.MemberwiseClone()

System.Object.ReferenceEquals(System.Object, System.Object)

Namespace: Lucene.Net.Codecs.Memory

Assembly: Lucene.Net.Codecs.dll

Syntax

[PostingsFormatName("Direct")]
public sealed class DirectPostingsFormat : PostingsFormat

Constructors

DirectPostingsFormat()

Declaration

public DirectPostingsFormat()

DirectPostingsFormat(Int32, Int32)

minSkipCount is how many terms in a row must have the same prefix before we put a skip pointer down. Terms with docFreq less than or equal lowFreqCutoff will use a single int[] to hold all docs, freqs, position and offsets; terms with higher docFreq will use separate arrays.

Declaration

public DirectPostingsFormat(int minSkipCount, int lowFreqCutoff)

Parameters

Type	Name	Description
System.Int32	minSkipCount
System.Int32	lowFreqCutoff

Methods

FieldsConsumer(SegmentWriteState)

Declaration

public override FieldsConsumer FieldsConsumer(SegmentWriteState state)

Parameters

Type	Name	Description
Lucene.Net.Index.SegmentWriteState	state

Returns

Type	Description
Lucene.Net.Codecs.FieldsConsumer

Overrides

Lucene.Net.Codecs.PostingsFormat.FieldsConsumer(Lucene.Net.Index.SegmentWriteState)

FieldsProducer(SegmentReadState)

Declaration

public override FieldsProducer FieldsProducer(SegmentReadState state)

Parameters

Type	Name	Description
Lucene.Net.Index.SegmentReadState	state

Returns

Type	Description
Lucene.Net.Codecs.FieldsProducer

Overrides

Lucene.Net.Codecs.PostingsFormat.FieldsProducer(Lucene.Net.Index.SegmentReadState)