jpountz opened a new pull request, #12622:
URL: https://github.com/apache/lucene/pull/12622
This adds `BPReorderingMergePolicy`, a merge policy wrapper that reorders
doc IDs on merge using a `BPIndexReorderer`.
- Reordering always run on forced merges.
- A `minNaturalMergeNumDocs` parameter helps only enable reordering on the
larger merged segments. This way, small merges retain all merging optimizations
like bulk copying of stored fields, and only the larger segments - which are
the most important for search performance - get reordered.
- If not enough RAM is available to perform reordering, reordering is
skipped.
To make this work, I had to add the ability for any merge to reorder doc IDs
of the merged segment via `OneMerge#reorder`. `MockRandomMergePolicy` from the
test framework randomly reverts the order of documents in a merged segment to
make sure this logic is properly exercised.
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