gokaai commented on code in PR #12530:
URL: https://github.com/apache/lucene/pull/12530#discussion_r1327351474
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lucene/core/src/java/org/apache/lucene/index/CheckIndex.java:
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@@ -610,6 +610,31 @@ public Status checkIndex(List<String> onlySegments,
ExecutorService executorServ
return result;
}
+ // https://github.com/apache/lucene/issues/7820: also attempt to open any
older commit points (segments_N), which will catch certain
+ // corruption like missing _N.si files for segments not also referenced by
the newest commit point (which was already loaded,
Review Comment:
> also referenced by the newest commit point (which was already loaded,
successfully, above
I don't think loading the latest commit point, i.e.,
[`readCommit(lastSegmentsFile)`](https://github.com/apache/lucene/blob/17dd8179e52d88ffc9b5cf3bf69833b54f552022/lucene/core/src/java/org/apache/lucene/index/CheckIndex.java#L601)
would succeed as assumed here because it will call
[`parseSegmentInfos`](https://github.com/apache/lucene/blob/17dd8179e52d88ffc9b5cf3bf69833b54f552022/lucene/core/src/java/org/apache/lucene/index/SegmentInfos.java#L372C1-L372C1)
will [iterate through all segmentInfos until the latest
commit](https://github.com/apache/lucene/blob/17dd8179e52d88ffc9b5cf3bf69833b54f552022/lucene/core/src/java/org/apache/lucene/index/SegmentInfos.java#L395)
and when it reaches the missing `_si` file, it would break with a
`java.nio.file.NoSuchFileException ../../_<segment>.si`
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