cpoerschke commented on a change in pull request #329:
URL: https://github.com/apache/solr/pull/329#discussion_r735751990



##########
File path: 
solr/core/src/java/org/apache/solr/handler/component/RealTimeGetComponent.java
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@@ -1265,10 +1265,12 @@ public void processGetUpdates(ResponseBuilder rb) 
throws IOException
 
     // TODO: get this from cache instead of rebuilding?
     try (UpdateLog.RecentUpdates recentUpdates = ulog.getRecentUpdates()) {
+      Set<Long> updateVersions = new HashSet<>();

Review comment:
       "should be small" is fairly subjective, how about initial capacity-ing 
it instead to communicate order-of-magnitude?
   
   ```suggestion
         Set<Long> updateVersions = new HashSet<>(versions.size());
   ```




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