cuibo01 commented on a change in pull request #2343:
URL: https://github.com/apache/hbase/pull/2343#discussion_r483414511



##########
File path: 
hbase-procedure/src/main/java/org/apache/hadoop/hbase/procedure2/RemoteProcedureDispatcher.java
##########
@@ -298,6 +299,8 @@ default boolean storeInDispatchedQueue() {
   // 
============================================================================================
   private final class TimeoutExecutorThread extends Thread {
     private final DelayQueue<DelayedWithTimeout> queue = new 
DelayQueue<DelayedWithTimeout>();
+    private final ConcurrentHashMap<DelayedWithTimeout, DelayedWithTimeout> 
pendingBufferNode =

Review comment:
       ?why use concurrentMap




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