leventov commented on a change in pull request #8809: Prohibit 
Futures.addCallback(Future, Callback)
URL: https://github.com/apache/incubator-druid/pull/8809#discussion_r342940087
 
 

 ##########
 File path: 
core/src/main/java/org/apache/druid/java/util/common/concurrent/ListenableFutures.java
 ##########
 @@ -61,15 +61,19 @@ public void onFailure(Throwable t)
           {
             finalFuture.setException(t);
           }
-        });
+        },
+            // The callback is non-blocking and quick, so it's OK to schedule 
it using directExecutor()
 
 Review comment:
   Too much indentation

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