CaoManhDat commented on a change in pull request #1470:
URL: https://github.com/apache/lucene-solr/pull/1470#discussion_r418404455



##########
File path: 
solr/core/src/java/org/apache/solr/handler/component/HttpShardHandler.java
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@@ -243,12 +233,13 @@ public ShardResponse takeCompletedOrError() {
   }
 
   private ShardResponse take(boolean bailOnError) {
+    try {
+      while (pending.get() > 0) {
+        ShardResponse rsp = responses.take();
+        if (rsp == END_QUEUE)

Review comment:
       So all usage of HttpShardHandler is single-thread. Submit tasks, 
takeResponse then cancelAll() if there are anyerror. Therefore even END_QUEUE 
is not needed here. I may add some comments to indicate that HttpShardHandler 
is not thread-safe.




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