atris commented on a change in pull request #916: LUCENE-8213: Asynchronous
Caching in LRUQueryCache
URL: https://github.com/apache/lucene-solr/pull/916#discussion_r330578984
##########
File path: lucene/core/src/java/org/apache/lucene/search/LRUQueryCache.java
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@@ -732,8 +821,24 @@ public ScorerSupplier scorerSupplier(LeafReaderContext
context) throws IOExcepti
if (docIdSet == null) {
if (policy.shouldCache(in.getQuery())) {
- docIdSet = cache(context);
- putIfAbsent(in.getQuery(), docIdSet, cacheHelper);
+ boolean cacheSynchronously = executor == null;
+
+ // If asynchronous caching is requested, perform the same and return
+ // the uncached iterator
+ if (cacheSynchronously == false) {
+ cacheSynchronously = cacheAsynchronously(context, cacheHelper);
+
+ // If async caching failed, synchronous caching will
+ // be performed, hence do not return the uncached value
+ if (cacheSynchronously == false) {
+ return in.scorerSupplier(context);
+ }
+ }
+
+ if (cacheSynchronously) {
Review comment:
We need this to be checked even after async caching since async caching
might have failed, in which case we will have to perform a synchronous caching
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