mikemccand commented on a change in pull request #923: LUCENE-8988: Introduce 
Global Feature Based Early Termination For Sorted Fields
URL: https://github.com/apache/lucene-solr/pull/923#discussion_r335019419
 
 

 ##########
 File path: lucene/core/src/java/org/apache/lucene/search/TopFieldCollector.java
 ##########
 @@ -130,8 +130,25 @@ public void setScorer(Scorable scorer) throws IOException 
{
         public void collect(int doc) throws IOException {
           ++totalHits;
           hitsThresholdChecker.incrementHitCount();
-          if (queueFull) {
-            if (collectedAllCompetitiveHits || reverseMul * 
comparator.compareBottom(doc) <= 0) {
+
+          Object currentValue = null;
+
+          if (fieldValueChecker != null) {
+            try {
+              currentValue = comparator.getDocValue(doc);
+            } catch (UnsupportedOperationException e) {
+              fieldValueChecker.disableGlobalHitCheck();
+            }
+          }
+
+          boolean isHitGloballyCompetitive = 
isHitGloballyCompetitive(currentValue, doc);
+
+          // There is a potential race condition here -- the hit may no longer 
be competitive between the
+          // two checks. However, the tradeoff is performing the global check 
twice -- which is expensive.
+          // Hence, the worst we can end up is an extra non competitive hit
+          if (queueFull || (isHitGloballyCompetitive == false)) {
+            if (collectedAllCompetitiveHits || (isHitGloballyCompetitive == 
false ||
 
 Review comment:
   Same here.

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