fishy commented on code in PR #3131:
URL: https://github.com/apache/thrift/pull/3131#discussion_r2063970234


##########
lib/java/src/main/java/org/apache/thrift/transport/TServerSocket.java:
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@@ -122,6 +126,7 @@ public TSocket accept() throws TTransportException {
       throw new TTransportException("Blocking server's accept() may not return 
NULL");
     }
     TSocket socket = new TSocket(result);
+    socket.getConfiguration().deepCopy(configuration_);

Review Comment:
   I think in general we want to propagate a single `TConfiguration` instance 
across the stack, vs. copying. This is at least implied in the spec of 
TConfiguration 
(https://github.com/apache/thrift/blob/master/doc/specs/thrift-tconfiguration.md,
 it mentioned "...we want to pass the instance by reference rather than by 
value.").
   
   That's also how I implemented it in go. see the NOTE part of the doc of 
TConfiguration for some explanation: 
https://pkg.go.dev/github.com/apache/thrift/lib/go/thrift#TConfiguration
   
   When implementing it for go we also deprecated most of the old constructors 
doing configuration without TConfiguration.



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