leventov commented on a change in pull request #8700: Add directExecutor for 
cancel
URL: https://github.com/apache/incubator-druid/pull/8700#discussion_r336733394
 
 

 ##########
 File path: server/src/main/java/org/apache/druid/client/DirectDruidClient.java
 ##########
 @@ -496,7 +497,8 @@ public void onFailure(Throwable t)
                 }
               }
             }
-          }
+          },
+          Execs.directExecutor()
 
 Review comment:
   `directExecutor()` and `sameThreadExecutor()` used by default are 
essentially the same, so how does it fix the problem?
   
   Independent of that, there should be a code comment explaining why explicit 
executor is provided.

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