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_r330582970
########## File path: lucene/core/src/java/org/apache/lucene/search/LRUQueryCache.java ########## @@ -88,13 +93,36 @@ * @lucene.experimental */ public class LRUQueryCache implements QueryCache, Accountable { + /** Act as key for the inflight queries map */ + private static class MapKey { + private final Query query; + private final IndexReader.CacheKey cacheKey; + + public MapKey(Query query, IndexReader.CacheKey cacheKey) { + this.query = query; + this.cacheKey = cacheKey; + } + + public Query getQuery() { + return query; + } + + public IndexReader.CacheKey getCacheKey() { + return cacheKey; + } + } private final int maxSize; private final long maxRamBytesUsed; private final Predicate<LeafReaderContext> leavesToCache; // maps queries that are contained in the cache to a singleton so that this // cache does not store several copies of the same query private final Map<Query, Query> uniqueQueries; + // Marks the inflight queries that are being asynchronously loaded into the cache + // This is used to ensure that multiple threads do not trigger loading + // of the same query in the same cache. We use a set because it is an invariant that + // the entries of this data structure be unique. + private final Map<MapKey, IndexReader.CacheKey> inFlightAsyncLoadQueries = new HashMap<>(); Review comment: Moved to set ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: us...@infra.apache.org With regards, Apache Git Services --------------------------------------------------------------------- To unsubscribe, e-mail: issues-unsubscr...@lucene.apache.org For additional commands, e-mail: issues-h...@lucene.apache.org