guojialiang92 commented on code in PR #13017:
URL: https://github.com/apache/lucene/pull/13017#discussion_r1457326578
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lucene/core/src/java/org/apache/lucene/index/IndexWriter.java:
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@@ -5136,7 +5141,13 @@ private int mergeMiddle(MergePolicy.OneMerge merge,
MergePolicy mergePolicy) thr
sci -> {
final ReadersAndUpdates rld = getPooledInstance(sci, true);
rld.setIsMerging();
- return rld.getReaderForMerge(context);
+ synchronized (this) {
+ return rld.getReaderForMerge(
+ context,
+ mr -> {
+ deleter.incRef(mr.reader.getSegmentInfo().files());
Review Comment:
Hello, This PR has noticed that
`IndexFileDeleter#incRef/IndexFileDeleter#decRef` needs to have the
`IndexWriter` lock. I will explain in detail:
1. `IndexFileDeleter#incRef` is called in `IndexWriter#mergeMiddle`. it has
been locked by `synchronized (this)` before the `IndexFileDeleter#incRef` is
called.
2. Another call of `IndexFileDeleter#incRef` in
`IndexWriter#preparePointInTimeMerge`. `IndexWriter#preparePointInTimeMerge` is
called by `IndexWriter#prepareCommitInternal` or `IndexWriter#getReader`.
`synchronized (this)` is performed in both `IndexWriter#prepareCommitInternal`
and `IndexWriter#getReader`, so the `IndexFileDeleter#incRef` in
`IndexWriter#preparePointInTimeMerge` does not need to be locked.
3. `IndexFileDeleter#decRef` is called in `IndexWriter#closeMergeReaders`.
`IndexWriter#closeMergeReaders` is a `synchronized` function.
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