[GitHub] [zookeeper] tisonkun commented on a change in pull request #1832: ZOOKEEPER-XXXX: Merge readOnly field into Connect{Request|Response}

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tisonkun commented on a change in pull request #1832:
URL: https://github.com/apache/zookeeper/pull/1832#discussion_r816424802



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File path: zookeeper-server/src/main/java/org/apache/zookeeper/server/ServerCnxn.java
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@@ -62,13 +62,6 @@
 
     private Set<Id> authInfo = Collections.newSetFromMap(new ConcurrentHashMap<Id, Boolean>());
 
-    /**
-     * If the client is of old version, we don't send r-o mode info to it.
-     * The reason is that if we would, old C client doesn't read it, which
-     * results in TCP RST packet, i.e. "connection reset by peer".
-     */
-    boolean isOldClient = true;

Review comment:
       This workaround is introduced at [ZOOKEEPER-784](https://issues.apache.org/jira/browse/ZOOKEEPER-784). And after 3.4.0 both the server & the client handle `readOnly` field.
   
   However, as jute's `serialize` & `deserialize` implemented atomically, this PR should be logically break client version less than 3.4 as documented here. I'll give it a test and wonder what the version policy and compatibility promise we should keep.
   
   cc @eolivelli @phunt 




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