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https://issues.apache.org/jira/browse/GEODE-8963?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17290268#comment-17290268
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ASF GitHub Bot commented on GEODE-8963:
---------------------------------------

bschuchardt commented on a change in pull request #6050:
URL: https://github.com/apache/geode/pull/6050#discussion_r582305997



##########
File path: 
geode-core/src/main/java/org/apache/geode/cache/client/internal/ClientSideHandshakeImpl.java
##########
@@ -355,7 +355,10 @@ private byte write(DataOutputStream dos, DataInputStream 
dis, CommunicationMode
         // for testing
         VersioningIO.writeOrdinal(hdos, overrideClientVersion, true);
       } else {
-        VersioningIO.writeOrdinal(hdos, currentClientVersion.ordinal(), true);
+        VersioningIO.writeOrdinal(hdos,
+            communicationMode.isWAN() ? KnownVersion.CURRENT_ORDINAL

Review comment:
       that I don't know.  We may want to change that, but WAN does some fancy 
& mysterious things in the handshake code and elsewhere and I wasn't sure it 
would be okay to roll its comms back to 1.8.




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> separate client/server compatibility from server/server version compatibility
> -----------------------------------------------------------------------------
>
>                 Key: GEODE-8963
>                 URL: https://issues.apache.org/jira/browse/GEODE-8963
>             Project: Geode
>          Issue Type: Improvement
>          Components: serialization
>            Reporter: Bruce J Schuchardt
>            Assignee: Bruce J Schuchardt
>            Priority: Minor
>              Labels: pull-request-available
>
> A client's version is used for deserializing data received from the client 
> and for serializing data sent to the client. It is also used to locate the 
> map of Commands used to process client requests. Every time we cut a new 
> release we bump this version in KnownVersions and create a new map of 
> Commands, even though client/server communications protocols rarely change.
>  We should have each KnownVersion hold a client/server compatibility number 
> that is used to identify clients rather than the KnownVersion's ordinal.
> For instance,
> {code:java}
>   public static final KnownVersion GEODE_1_15_0 =
>       new KnownVersion("GEODE", "1.15.0", (byte) 1, (byte) 15, (byte) 0, 
> (byte) 0,
>           /*server/server version*/GEODE_1_15_0_ORDINAL, 
>           /*client/server version*/GEODE_1_15_0_ORDINAL);
>   
> public static final KnownVersion GEODE_1_16_0 =
>       new KnownVersion("GEODE", "1.16.0", (byte) 1, (byte) 16, (byte) 0, 
> (byte) 0,
>           /*server/server version*/GEODE_1_16_0_ORDINAL, 
>           /*client/server version*/GEODE_1_15_0_ORDINAL);
> public static final KnownVersion GEODE_1_17_0 =
>       new KnownVersion("GEODE", "1.17.0", (byte) 1, (byte) 17, (byte) 0, 
> (byte) 0,
>           /*server/server version*/GEODE_1_17_0_ORDINAL, 
>           /*client/server version*/GEODE_1_15_0_ORDINAL);
> {code}
> In the above KnownVersions the client/server serialization is known to have 
> not changed since v1.15.0 and so there is no need to use a newer KnownVersion 
> for clients.
> Client handshake code will need to be changed to use the client/server 
> ordinal when identifying clients and servers.



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