Class DirectPostingsFormat

Wraps 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 Ord and SeekExact(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.

This is a Lucene.NET EXPERIMENTAL API, use at your own risk

Inheritance
System.Object
PostingsFormat
DirectPostingsFormat
Inherited Members
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

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DirectPostingsFormat()

Declaration
public DirectPostingsFormat()
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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

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FieldsConsumer(SegmentWriteState)

Declaration
public override FieldsConsumer FieldsConsumer(SegmentWriteState state)
Parameters
Type Name Description
SegmentWriteState state
Returns
Type Description
FieldsConsumer
Overrides
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FieldsProducer(SegmentReadState)

Declaration
public override FieldsProducer FieldsProducer(SegmentReadState state)
Parameters
Type Name Description
SegmentReadState state
Returns
Type Description
FieldsProducer
Overrides