Haoyu Zhai created LUCENE-9694:
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Summary: New tool for creating a deterministic index
Key: LUCENE-9694
URL: https://issues.apache.org/jira/browse/LUCENE-9694
Project: Lucene - Core
Issue Type: New Feature
Components: general/tools
Reporter: Haoyu Zhai
Lucene's index is segmented, and sometimes number of segments and documents
arrangement greatly impact performance.
Given a stable index sort, our team create a tool that records document
arrangement (called index map) of an index and rearrange another index
(consists of same documents) into the same structure (segment num, and
documents included in each segment).
This tool could be also used in lucene benchmarks for a faster deterministic
index construction (if I understand correctly lucene benchmark is using a
single thread manner to achieve this).
We've already had some discussion in email
[https://markmail.org/message/lbtdntclpnocmfuf]
And I've implemented the first method, using {{IndexWriter.addIndexes}} and a
customized {{FilteredCodecReader}} to achieve the goal. The index construction
time is about 25min and time executing this tool is about 10min.
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