benwtrent commented on code in PR #13306:
URL: https://github.com/apache/lucene/pull/13306#discussion_r1583351253
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lucene/core/src/java/org/apache/lucene/search/LRUQueryCache.java:
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@@ -628,7 +632,7 @@ private class LeafCache implements Accountable {
LeafCache(Object key) {
this.key = key;
- cache = new IdentityHashMap<>();
+ cache = Collections.synchronizedMap(new IdentityHashMap<>());
Review Comment:
I don't understand this. Aren't all accesses to `LeafCache` protected by the
LRUQueryCache read/write locks?
Since `LeafCache` isn't a static class, it should have access to the
enclosing class's lock.
For testing safety, putIfAbsent, remove, onDocIdSetCache, and
onDocIdSetEviction should all do a `assert writeLock.isHeldByCurrentThread();`
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