mccormickt12 commented on code in PR #5803:
URL: https://github.com/apache/hadoop/pull/5803#discussion_r1258991487


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hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/server/namenode/ha/ObserverReadProxyProvider.java:
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@@ -648,6 +645,7 @@ public synchronized void close() throws IOException {
       }
     }
     failoverProxy.close();
+    nnProbingThreadPool.shutdown();

Review Comment:
   so whats the expected behavior? We finish, then it'll idle for how many 
seconds (blocking)?
   also its not obvious to me that the main thread timing out or the GC calling 
close is the thing that we will be blocked on



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