mayya-sharipova opened a new issue, #15673:
URL: https://github.com/apache/lucene/issues/15673
The backward-compatible codec impersonators (*RWCodec classes) in
lucene/backward-codecs exist solely for testing purposes. Since Lucene supports
MIN_SUPPORTED_MAJOR - 1, Lucene 8.x indices are no longer readable in Lucene
10.x+.
Maintaining this test infrastructure creates an ongoing maintenance
burden, as evidenced by PR #15616 where compoundFormat() methods weren't
caching instances properly, causing test failures.
Codecs to Remove
- Lucene84RWCodec
- Lucene86RWCodec
- Lucene87RWCodec
Background
From @mikemccand in #15616:
We generally shy away from having Codec writer components have mutable
(setters) state
From @uschindler in #15616:
We never cleaned up our old index codecs. We should remove all backwards
codecs and especially their write support for no-longer supported index
versions. Remove everything that's not needed anymore after removing the
top-level-codecs for each version.
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