Class CachedOrdinalsReader

A per-segment cache of documents' facet ordinals. Every CachedOrdinalsReader.CachedOrds holds the ordinals in a raw int[], and therefore consumes as much RAM as the total number of ordinals found in the segment, but saves the CPU cost of decoding ordinals during facet counting.

NOTE: every CachedOrdinalsReader.CachedOrds is limited to 2.1B total ordinals. If that is a limitation for you then consider limiting the segment size to fewer documents, or use an alternative cache which pages through the category ordinals.

NOTE: when using this cache, it is advised to use a DocValuesFormat that does not cache the data in memory, at least for the category lists fields, or otherwise you'll be doing double-caching.

NOTE: create one instance of this and re-use it for all facet implementations (the cache is per-instance, not static).

Inheritance
System.Object
OrdinalsReader
CachedOrdinalsReader
Implements
Lucene.Net.Util.IAccountable
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)
System.Object.ToString()
Namespace: Lucene.Net.Facet.Taxonomy
Assembly: Lucene.Net.Facet.dll
Syntax
public class CachedOrdinalsReader : OrdinalsReader, IAccountable

Constructors

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CachedOrdinalsReader(OrdinalsReader)

Sole constructor.

Declaration
public CachedOrdinalsReader(OrdinalsReader source)
Parameters
Type Name Description
OrdinalsReader source

Properties

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IndexFieldName

Declaration
public override string IndexFieldName { get; }
Property Value
Type Description
System.String
Overrides

Methods

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GetReader(AtomicReaderContext)

Declaration
public override OrdinalsReader.OrdinalsSegmentReader GetReader(AtomicReaderContext context)
Parameters
Type Name Description
Lucene.Net.Index.AtomicReaderContext context
Returns
Type Description
OrdinalsReader.OrdinalsSegmentReader
Overrides
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RamBytesUsed()

Declaration
public virtual long RamBytesUsed()
Returns
Type Description
System.Int64

Implements

Lucene.Net.Util.IAccountable