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Add compression of posting lists for inverted index #56226
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alexey-milovidov
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can be tested
Allows running workflows for external contributors
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Nov 1, 2023
robot-ch-test-poll1
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pr-improvement
Pull request with some product improvements
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Nov 1, 2023
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rschu1ze
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rschu1ze
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can be tested
Allows running workflows for external contributors
pr-improvement
Pull request with some product improvements
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Currently inverted index didn't take advantage of compression to reduce the storage footprint. This PR added code for compressing posting lists which can save index storage space. After testing different databases, we can see that it reduces the postings list file sizes by 10-30%.
Note that compression of term dictionary files has also been tried but we found it didn't reduce much storages so we leave these files uncompressed as before.
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Changelog entry (a user-readable short description of the changes that goes to CHANGELOG.md):
Posting lists in inverted indexes are now compressed which reduces their size by 10-30%.