mikemccand commented on a change in pull request #823: LUCENE-8939: Introduce
Shared Count Early Termination In Parallel Search
URL: https://github.com/apache/lucene-solr/pull/823#discussion_r320305075
##########
File path: lucene/core/src/java/org/apache/lucene/search/TopFieldCollector.java
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@@ -410,10 +423,34 @@ public static TopFieldCollector create(Sort sort, int
numHits, FieldDoc after,
throw new IllegalArgumentException("after.fields has " +
after.fields.length + " values but sort has " + sort.getSort().length);
}
- return new PagingFieldCollector(sort, queue, after, numHits,
totalHitsThreshold);
+ return new PagingFieldCollector(sort, queue, after, numHits,
hitsThresholdChecker);
}
}
+ /**
+ * Create a CollectorManager which uses a shared hit counter to maintain
number of hits
+ */
+ public static CollectorManager<TopFieldCollector, TopFieldDocs>
createSharedManager(Sort sort, int numHits, FieldDoc after,
+
int totalHitsThreshold) {
+ return new CollectorManager<>() {
+
+ @Override
+ public TopFieldCollector newCollector() throws IOException {
+ return create(sort, numHits, after,
HitsThresholdChecker.createShared(totalHitsThreshold));
Review comment:
Shouldn't we create the shared `HitsThresholdChecker` up front (at the top
of the `createSharedManager` method), not here? Else we are making a new
shared instance for every segment slice (searcher thread), instead of sharing a
single one for the whole query?
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