cloud-fan commented on a change in pull request #26624:
URL: https://github.com/apache/spark/pull/26624#discussion_r427024406



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File path: core/src/main/scala/org/apache/spark/util/ThreadUtils.scala
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@@ -133,6 +133,14 @@ private[spark] object ThreadUtils {
     
Executors.newCachedThreadPool(threadFactory).asInstanceOf[ThreadPoolExecutor]
   }
 
+  /**
+   * Wrapper over newCachedThreadPool. Thread names are formatted as 
prefix-ID, where ID is a

Review comment:
       This doesn't really have a prefix in the name. Can we inline this 
method? It's only called once.




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