showuon commented on code in PR #15317:
URL: https://github.com/apache/kafka/pull/15317#discussion_r1481224501


##########
docs/ops.html:
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@@ -4054,16 +4054,19 @@ <h3>Reverting to ZooKeeper mode During the 
Migration</h3>
           </ul>
         </td>
         <td>
-          It is important to perform the <code>zookeeper-shell.sh</code> step 
quickly, to minimize the amount of
-          time that the cluster lacks a controller.
+          It is important to perform the <code>zookeeper-shell.sh</code> step 
<b>quickly</b>, to minimize the amount of
+          time that the cluster lacks a controller. Until the <code> 
/controller</code> znode is deleted,

Review Comment:
   `Until the <code> /controller</code> znode is deleted, you can also ignore 
any errors in the broker log`
   
   From my understanding, I think the error will disappear after broker roll 
into pure ZK mode, that is, the broker config doesn't contain voters info. Is 
that right?
   
   
   



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