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https://issues.apache.org/jira/browse/LUCENE-8005?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16215659#comment-16215659
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Scott Somerville commented on LUCENE-8005:
------------------------------------------
In case the above was too nonsensical, here is another snippet that actually
uses the change:
{code:java}
long start = System.currentTimeMillis();
Query q = IntPoint.newRangeQuery("intField", 1, 1000);
for (int i = 0; i < 10_000_000; i++) {
assertTrue(UsageTrackingQueryCachingPolicy.isCostly(q));
}
System.out.println("Took " + (System.currentTimeMillis() - start) + "ms");
{code}
I ran it before and after, 3 times each:
{noformat}
BEFORE: Took 7019ms, Took 7074ms, Took 8108ms
AFTER: Took 17ms, Took 12ms, Took 17ms
{noformat}
> Avoid Reflection in UsageTrackingQueryCachingPolicy
> ---------------------------------------------------
>
> Key: LUCENE-8005
> URL: https://issues.apache.org/jira/browse/LUCENE-8005
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Scott Somerville
> Attachments: LUCENE-8005.patch
>
>
> By profiling an Elasticsearch cluster, I found the private method
> UsageTrackingQueryCachingPolicy.isPointQuery to be quite expensive due to the
> clazz.getSimpleName() call.
> Here is an excerpt from hot_threads:
> {noformat}
> java.lang.Class.getEnclosingMethod0(Native Method)
> java.lang.Class.getEnclosingMethodInfo(Class.java:1072)
> java.lang.Class.getEnclosingClass(Class.java:1272)
> java.lang.Class.getSimpleBinaryName(Class.java:1443)
> java.lang.Class.getSimpleName(Class.java:1309)
>
> org.apache.lucene.search.UsageTrackingQueryCachingPolicy.isPointQuery(UsageTrackingQueryCachingPolicy.java:39)
>
> org.apache.lucene.search.UsageTrackingQueryCachingPolicy.isCostly(UsageTrackingQueryCachingPolicy.java:54)
>
> org.apache.lucene.search.UsageTrackingQueryCachingPolicy.minFrequencyToCache(UsageTrackingQueryCachingPolicy.java:121)
>
> org.apache.lucene.search.UsageTrackingQueryCachingPolicy.shouldCache(UsageTrackingQueryCachingPolicy.java:179)
>
> org.elasticsearch.index.shard.ElasticsearchQueryCachingPolicy.shouldCache(ElasticsearchQueryCachingPolicy.java:53)
>
> org.apache.lucene.search.LRUQueryCache$CachingWrapperWeight.bulkScorer(LRUQueryCache.java:806)
>
> org.elasticsearch.indices.IndicesQueryCache$CachingWeightWrapper.bulkScorer(IndicesQueryCache.java:168)
> org.apache.lucene.search.IndexSearcher.search(IndexSearcher.java:665)
> org.apache.lucene.search.IndexSearcher.search(IndexSearcher.java:472)
> org.elasticsearch.search.query.QueryPhase.execute(QueryPhase.java:388)
> org.elasticsearch.search.query.QueryPhase.execute(QueryPhase.java:108)
> {noformat}
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