Index sections #165
Index sections #165
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Thejas-bhat
commented
Jul 18, 2023
•
Thejas-bhat
commented
- Introduces the concept of section which talks about reformating the index file as a set of sections each section corresponding to a certain type of index.
- Refactors the inverted index data i.e. the term dictionary, postings list etc. as part of a section.
work in progress
abhinavdangeti
requested review from
metonymic-smokey,
CascadingRadium,
Likith101 and
moshaad7
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| numDocs: numDocs, | ||
| storedIndexOffset: storedIndexOffset, | ||
| fieldsIndexOffset: sectionsIndexOffset, | ||
| sectionsIndexOffset: sectionsIndexOffset, |
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How come the fieldsIndexOffset and sectionsIndexOffset are the same here?
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essentially sections index content contains the same as fields index + sections information. so, for the fieldsIndexOffset which gives info about the fields in a segment we just consult the sectionsIndexOffset to get that info. Also, the field is needed for backward compatibility purposes as well.
| @@ -74,14 +73,14 @@ func mergeSegmentBases(segmentBases []*SegmentBase, drops []*roaring.Bitmap, pat | |||
| // wrap it for counting (tracking offsets) | |||
| cr := NewCountHashWriterWithStatsReporter(br, s) | |||
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| newDocNums, numDocs, storedIndexOffset, fieldsIndexOffset, docValueOffset, _, _, _, err := | |||
| newDocNums, numDocs, storedIndexOffset, fieldsIndexOffset, docValueOffset, _, _, _, sectionsIndexOffset, err := | |||
| MergeToWriter(segmentBases, drops, chunkMode, cr, closeCh) | |||
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Let's try and keep the signature of InitSegmentBase and MergeToWriter similar in terms of the index offsets.
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Did you mean interm.convert()'s signature over here?
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| // as part of the merge API, write the merged data to the writer and also track | ||
| // the starting offset of this newly merged section data. | ||
| Merge(opaque map[int]resetable, segments []*SegmentBase, drops []*roaring.Bitmap, fieldsInv []string, | ||
| newDocNumsIn [][]uint64, w *CountHashWriter, closeCh chan struct{}) error |
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newDocNumsIn should also have uint32 no? like newDocNums[3][4] = x will mean the new Doc Num for a document in segment 3 with docnumber 4 will be x. So x has to be uint32 only.
* initial sections code for dense vector index --------- Co-authored-by: Abhi Dangeti <abhinav@couchbase.com>
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the main reason why I kept the docNum's type to be uint64 was to ensure that we don't break anything around the existing code - I was being conservative to make additional changes to the existing function signatures etc. do you all think its better to finalize whether to use uint32 or uint64 for docNum (after testing it better for eg) in a later PR? or do you want me to include this in the current PR? |
@Thejas-bhat I pushed that last commit up to unbreak the build. The type of the faissIndexSection's Process didn't match with the section interface's Process. We can talk about changing the type later if really needed. |
* index sections * faiss index section + inverted text index section Co-authored-by: Marty Schoch <marty.schoch@gmail.com> Co-authored-by: Abhi Dangeti <abhinav@couchbase.com>
