HDFS-14997. Addendum: BPServiceActor processes commands from NameNode asynchronously. Contributed by Xiaoqiao He.

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/BPServiceActor.java

@@ -596,6 +596,9 @@ class BPServiceActor implements Runnable {
     if (bpThread != null) {
       bpThread.interrupt();
     }
+    if (commandProcessingThread != null) {
+      commandProcessingThread.interrupt();
+    }
   }
   
   //This must be called only by blockPoolManager