Package org.apache.lucene.codecs.uniformsplit.sharedterms

Class STUniformSplitPostingsFormat

java.lang.Object

org.apache.lucene.codecs.PostingsFormat

org.apache.lucene.codecs.uniformsplit.UniformSplitPostingsFormat

org.apache.lucene.codecs.uniformsplit.sharedterms.STUniformSplitPostingsFormat

All Implemented Interfaces:

NamedSPILoader.NamedSPI

public class STUniformSplitPostingsFormat
extends UniformSplitPostingsFormat

PostingsFormat based on the Uniform Split technique and supporting Shared Terms.

Shared Terms means the terms of all fields are stored in the same block file, with multiple fields associated to one term (one block line). In the same way, the dictionary trie is also shared between all fields. This highly reduces the memory required by the field dictionary compared to having one separate dictionary per field.

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

Field Summary

Fields

Modifier and Type	Field	Description
static String	NAME
static String	TERMS_BLOCKS_EXTENSION	Extension of the file containing the terms blocks for each field and the fields metadata.
static String	TERMS_DICTIONARY_EXTENSION	Extension of the file containing the terms dictionary (the FST "trie").
static int	VERSION_CURRENT

Fields inherited from class org.apache.lucene.codecs.uniformsplit.UniformSplitPostingsFormat

blockDecoder, blockEncoder, deltaNumLines, dictionaryOnHeap, targetNumBlockLines, VERSION_ENCODABLE_FIELDS_METADATA, VERSION_START

Fields inherited from class org.apache.lucene.codecs.PostingsFormat

EMPTY

Constructor Summary

Constructors

Modifier	Constructor	Description
	STUniformSplitPostingsFormat()	Creates a STUniformSplitPostingsFormat with default settings.
	STUniformSplitPostingsFormat(int targetNumBlockLines, int deltaNumLines, BlockEncoder blockEncoder, BlockDecoder blockDecoder, boolean dictionaryOnHeap)
protected	STUniformSplitPostingsFormat(String name, int targetNumBlockLines, int deltaNumLines, BlockEncoder blockEncoder, BlockDecoder blockDecoder, boolean dictionaryOnHeap)

Method Summary

Modifier and Type	Method	Description
protected FieldsProducer	createUniformSplitTermsReader(PostingsReaderBase postingsReader, SegmentReadState state, BlockDecoder blockDecoder)
protected FieldsConsumer	createUniformSplitTermsWriter(PostingsWriterBase postingsWriter, SegmentWriteState state, int targetNumBlockLines, int deltaNumLines, BlockEncoder blockEncoder)

Methods inherited from class org.apache.lucene.codecs.uniformsplit.UniformSplitPostingsFormat

fieldsConsumer, fieldsProducer

Methods inherited from class org.apache.lucene.codecs.PostingsFormat

availablePostingsFormats, forName, getName, reloadPostingsFormats, toString

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

TERMS_DICTIONARY_EXTENSION

public static final String TERMS_DICTIONARY_EXTENSION

Extension of the file containing the terms dictionary (the FST "trie").

See Also:

Constant Field Values

TERMS_BLOCKS_EXTENSION

public static final String TERMS_BLOCKS_EXTENSION

Extension of the file containing the terms blocks for each field and the fields metadata.

See Also:

Constant Field Values

VERSION_CURRENT

public static final int VERSION_CURRENT

See Also:

Constant Field Values

NAME

public static final String NAME

See Also:

Constant Field Values

Constructor Detail

STUniformSplitPostingsFormat

public STUniformSplitPostingsFormat()

Creates a STUniformSplitPostingsFormat with default settings.

STUniformSplitPostingsFormat

public STUniformSplitPostingsFormat(int targetNumBlockLines,
                                    int deltaNumLines,
                                    BlockEncoder blockEncoder,
                                    BlockDecoder blockDecoder,
                                    boolean dictionaryOnHeap)

See Also:

UniformSplitPostingsFormat(int, int, BlockEncoder, BlockDecoder, boolean)

STUniformSplitPostingsFormat

protected STUniformSplitPostingsFormat(String name,
                                       int targetNumBlockLines,
                                       int deltaNumLines,
                                       BlockEncoder blockEncoder,
                                       BlockDecoder blockDecoder,
                                       boolean dictionaryOnHeap)

Method Detail

createUniformSplitTermsWriter

protected FieldsConsumer createUniformSplitTermsWriter(PostingsWriterBase postingsWriter,
                                                       SegmentWriteState state,
                                                       int targetNumBlockLines,
                                                       int deltaNumLines,
                                                       BlockEncoder blockEncoder)
                                                throws IOException

Overrides:

createUniformSplitTermsWriter in class UniformSplitPostingsFormat

Throws:

IOException

createUniformSplitTermsReader

protected FieldsProducer createUniformSplitTermsReader(PostingsReaderBase postingsReader,
                                                       SegmentReadState state,
                                                       BlockDecoder blockDecoder)
                                                throws IOException

Overrides:

createUniformSplitTermsReader in class UniformSplitPostingsFormat

Throws:

IOException