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https://issues.apache.org/jira/browse/LUCENE-10574?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17538746#comment-17538746
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Adrien Grand commented on LUCENE-10574:
---------------------------------------
I used BaseMergePolicyTestCase's simulation logic to run some tests with 10k
docs, flushed 3 by 3 where each doc uses 10 bytes on disk:
|| || TieredMergePolicy's default || TieredMergePolicy with floo segment size =
Double.MIN_VALUE || TieredMergePolicy constrained to never produce merges where
the overal size of the merge is not at least 50% larger than the biggest input
segment ||
|Write amplification| 94.0 | 3.6 | 7.7 |
|Average number of segments in the index| 6.0 | 24.4 | 6.7 |
> Remove O(n^2) from TieredMergePolicy or change defaults to one that doesn't
> do this
> -----------------------------------------------------------------------------------
>
> Key: LUCENE-10574
> URL: https://issues.apache.org/jira/browse/LUCENE-10574
> Project: Lucene - Core
> Issue Type: Bug
> Reporter: Robert Muir
> Priority: Major
>
> Remove {{floorSegmentBytes}} parameter, or change lucene's default to a merge
> policy that doesn't merge in an O(n^2) way.
> I have the feeling it might have to be the latter, as folks seem really wed
> to this crazy O(n^2) behavior.
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