shbhar commented on code in PR #16923:
URL: https://github.com/apache/lucene/pull/16923#discussion_r4476821070
##########
lucene/core/src/java/org/apache/lucene/index/StandardDirectoryReader.java:
##########
@@ -463,10 +463,12 @@ private DirectoryReader doOpenFromWriter(IndexCommit
commit, ExecutorService exe
return null;
}
- DirectoryReader reader = writer.getReader(applyAllDeletes,
writeAllDeletes);
+ StandardDirectoryReader reader = writer.getReader(applyAllDeletes,
writeAllDeletes);
- // If in fact no changes took place, return null:
- if (reader.getVersion() == segmentInfos.getVersion()) {
+ // If in fact no changes took place, return null. A commit that was
syncing files when this
+ // reader was opened changes the referenced segments_N once it completes,
but not the version:
+ if (reader.getVersion() == segmentInfos.getVersion()
+ && reader.segmentInfos.getLastGeneration() ==
segmentInfos.getLastGeneration()) {
Review Comment:
thanks, the randomized concurrent tests look good! They help build
confidence in this complicated logic. The extra bug fix is great too, lets keep
it.
The overall changes look good to me right now, but I want to spend a bit
more time on it to make sure Im not still missing something (will do tomorrow)
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