Apache9 commented on a change in pull request #343: HBASE-22634 : Improve 
performance of BufferedMutator        
URL: https://github.com/apache/hbase/pull/343#discussion_r298119918
 
 

 ##########
 File path: 
hbase-client/src/main/java/org/apache/hadoop/hbase/ipc/AbstractRpcClient.java
 ##########
 @@ -491,13 +482,13 @@ public void close() {
       connToClose = connections.values();
       connections.clear();
     }
-    cleanupIdleConnectionTask.cancel(true);
     for (T conn : connToClose) {
-      conn.shutdown();
+      // conn may be null in case of cancellation
+      if (conn != null) conn.shutdown();
 
 Review comment:
   The code you paste here do not set the value to null I think? If you 
actually hit an NPE, then I think there must be something wrong at other 
places. Looking at the code for PoolMap, which pool type do you use?

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