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_r327567246
##########
File path: lucene/core/src/java/org/apache/lucene/search/LRUQueryCache.java
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@@ -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:
Can you save the return value from `putIfAbsent` call and then `assert` it's
`null`? I.e. the cache should never already have this query since we checked
up-front in thread tight manner?
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