Abacn commented on code in PR #36271:
URL: https://github.com/apache/beam/pull/36271#discussion_r2392273067


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CHANGES.md:
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@@ -94,6 +94,10 @@
 * PulsarIO has now changed support status from incomplete to experimental. 
Both read and writes should now minimally
   function (un-partitioned topics, without schema support, timestamp ordered 
messages for read) (Java)
   ([#36141](https://github.com/apache/beam/issues/36141)).
+* (Python) Logical type and coder registry are saved for pipelines with 
`save_main_session` pipeline option enabled in

Review Comment:
   I agree it becomes misleading naming, unfortunately this flag was named by 
implementation detail instead of what user want to achieve (states at 
submission session env are preserved job execution time). Here I want to 
un-break existing pipeline option setting. If user needs a new flag on 
upgrading their pipeline they can choose to add `--pickle_library=dill`. 
Probably one can add an alias "--save_beam_registries" and recommend for use 
for new users.
   
   Making it enabled all times is a step further and has risk of new breakages, 
though I haven't observe



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