10. A Lucene Segment <SegName, SegSize> SegCount Version Name Counter SegCount Format
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16. Segment layout T i+1 T j+k T j T i .tii file (in memory) .tis file (in disk) Random seeks Contiguous reads T q IndexDelta .frq/posting file (in disk) T q+1 Term DocFreq FreqDelta ProxDelta SkipDelta TF 1 TF d Posting-list(term-freqs) SD 1 SD d/sk SD 2 DocId FreqSk TF sk ProxSk .prx file Used to merge postings