mikemccand commented on a change in pull request #815: LUCENE-8213: Introduce 
Asynchronous Caching in LRUQueryCache
URL: https://github.com/apache/lucene-solr/pull/815#discussion_r327870291
 
 

 ##########
 File path: lucene/core/src/java/org/apache/lucene/search/LRUQueryCache.java
 ##########
 @@ -832,5 +889,25 @@ public BulkScorer bulkScorer(LeafReaderContext context) 
throws IOException {
       return new DefaultBulkScorer(new ConstantScoreScorer(this, 0f, 
ScoreMode.COMPLETE_NO_SCORES, disi));
     }
 
+    // Perform a cache load asynchronously
+    private void cacheAsynchronously(LeafReaderContext context, 
IndexReader.CacheHelper cacheHelper) {
+      /*
+       * If the current query is already being asynchronously cached,
+       * do not trigger another cache operation
+       */
+      if (inFlightAsyncLoadQueries.add(in.getQuery()) == false) {
+        return;
+      }
+
+      FutureTask<Void> task = new FutureTask<>(() -> {
+        DocIdSet localDocIdSet = cache(context);
+        putIfAbsent(in.getQuery(), localDocIdSet, cacheHelper);
 
 Review comment:
   Ahh OK let's do that later then.

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