Lemur索引文件格式分析.docx
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Lemur索引文件格式分析.docx
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Lemur索引文件格式分析
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IndriBuildIndexC索引文件格式
IndriBuildIndexC索引文件格式....................................................................................1I.Repository.................................................................................................................1A.文件列表及描述.......................................................................................................1II.DiskIndex..................................................................................................................1A.文件列表及描述.......................................................................................................1B.文件格式(参见IndexWriter:
:
write()).................................................................2III.CompressedCollection..........................................................................................3A.文件列表及描述.......................................................................................................4B.文件格式(参见CompressedCollection:
:
addDocument())..................................4
I.RepositoryA.文件列表及描述
FileNameIndex(Directory)collection(Directory)deletedmanifestDescriptionContainszeroormoreDiskIndexinstances,innumberedsubdirectories.ContainsaCompressedCollectioninstance.Bitmapcontainingalistofalldeleteddocuments.XMLfilestoringconfigurationinformationaboutthecollection,includingindexcounts,stemmerandstopwordinformation.
II.DiskIndexA.文件列表及描述
FileNamedirectFiledocumentLengthsdocumentStatisticsfieldsFilefrequentIDfrequentStringfrequentTermsDescriptionNumericrepresentationofeachdocumentinthecollection,usefulforqueryexpansionLengthofeachdocumentinwords,4bytesperdocumentOffsetofeachdocumentinthedirectFile,documentlengthinthedirectFile,documenttermlength,numberofuniquetermsineachdocumentInvertedextentlistforfieldsBulkTreestoringthemappingfromtermIDtotermStringandtermstatisticsforfrequenttermsBulkTreestoringthemappingfromtermStringtotermIDandtermstatisticsforfrequenttermsListoftermID,termStringpairs,notstoredinatree,usedatindexmergetime
infrequentIDinfrequentStringinvertedFilemanifest
BulkTreestoringthemappingfromtermIDtotermStringandtermstatisticsforinfrequenttermsBulkTreestoringthemappingfromtermStringtotermIDandtermstatisticsforinfrequenttermsInvertedlistsforeachterminthecollectionXMLfilestoringimportantcollectionstatisticsandconfigurationinformation
文件格式(IndexWriter:
:
write()())B.文件格式(参见IndexWriter:
:
write())
invertedFileinvertedFileTermStatistic<{TermInvDataOffset}TermStatistic,TermInvList>*RVLDataLength(UINT32),[TermString(CString),TermData]TermDocCount(UInt),TermMaxDocLength(UInt),
TermDataTermTotalCount(UINT64),TermMinDocLength(UInt),TermFieldStatisticsTermFieldStatisticsTermInvListTopDocsBatchDataDocEntry
ControlByte(Byte),
frequentTerms,frequentID,frequentString,infrequentID,frequentStringfrequentTermsfrequentIDfrequentStringDistTermData1DiskTermData2DistTermData3
TermFilePointerinfrequentIDinfrequentStringfieldsFilefieldsFileBatchData
TermInvDataOffset(UINT64),TermInvDataLength(UINT64)Map
{FieldDataOffset}ControlByte(UINT8),
NextBatchDocID(DOCID_T),RVLDataLength(Int),[
ExtentCount(Int), ExtentParent(Int)? ExtentNumber(INT64)? >ExtentCountdirectFile,documentLengths,documentStatisticsdirectFile DocDirectData FiledID(Int), FilesdParentOrdinal(Int), FieldBegin(Int), FieldEnd(Int), DocumentDataDocDirectDataOffset(UINT64),DocDirectDataLength(Int),DocIndexedLength(Int),DocTotalLength(Int),DocUniqTermCount(Int)manifestmanifestIndexType(CString),IndexBuildDate(CString),IndriDistribution(CString),CorpusStatistics, TotalDocCount(UInt),TotalTermCount(UINT64),FieldDataOffset(UINT64) III. CompressedCollectionCompressedCollection A.文件列表及描述 FileNamelookupmanifeststorageDescriptionKeyfile(B-Tree)thatstoresthemappingbetweendocumentedandoffsetintostorageXMLfilestoringconfigurationinformationforthisCompressedCollectionStorescompressedversionofeachdocument(hereusingzlibcompressionlibrary)inthecollection,alongwithbyteoffsetsforeachwordineachdocument,andvariousdocumentmetadataaddedatindextime.Keyfile(B-Tree)thatstoresthemappingbetweenadocumentIDandametadatastringKeyfile(B-Tree)thatstoresthemappingbetweenametadatastringandoneormoredocumentIDs forwardLookupnreverseLookupn 文件格式(CompressedCollection: : addDocument()B.文件格式(参见CompressedCollection: : addDocument()) lookuplookupMap manifestmanifestForwardMetadataList,ReverseMetadataListMetadataName(String)MetadataName(String) ForwardMetadataListReverseMetadataListstoragestorage <{StorageDocOffset}StorageDocData>* StorageDocDataPairCount(UINT32)KeyValuePairMetadataPair MetadataPair|TermPositionPair|TextPair|ContentPair|ContentLengthPairMetadataKey(CString),MetadataValue(Void*)TermPositionFlag(CString), TermPositionPairTextPair TextFlag(CString),TextData(Void*) ContentPair ContentFlag(CString),ContentOffset(Int)ContentLengthFlag(CString),ContentLength(Int) ContentLengthPair forwardLookupn,reverseLookupnforwardLookupnreverseLookupnMap 尊重他人劳动,转载请注明来自[PDF转换成WROD_PDF阅读器下载: 本文【Lemur索引文件格式分析】网址:
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