[jira] [Created] (PHOENIX-3136) Relocation of Avatica classes breaks compatibilty between older version of thin-client/PQS

["Josh Elser (JIRA)" <ji...@apache.org>]

Josh Elser created PHOENIX-3136:
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             Summary: Relocation of Avatica classes breaks compatibilty between older version of thin-client/PQS
                 Key: PHOENIX-3136
                 URL: https://issues.apache.org/jira/browse/PHOENIX-3136
             Project: Phoenix
          Issue Type: Bug
            Reporter: Josh Elser
            Assignee: Josh Elser
            Priority: Blocker
             Fix For: 4.8.0


It was recently brought to my attention by [~holman.lan0@gmail.com] that the shading change will break all previous versions of the thin client from working with the newer PQS (and vice versa).

Avatica uses the full class name in the message to identify what protobuf message to use to deserialize the bytes from the wire. As such, an older thin client would be expecting these protobuf classes to look like {{org.apache.calcite.avatica.proto.Responses$PrepareResponse}}. However after PHOENIX-2535, PQS would be sending back {{org.apache.phoenix.shaded.org.apache.calcite.avatica.proto.Responses$PrepareResponse}}. Both are trying to refer to the same Java class, but we can't disambiguate presently.

Long term, I think the protocol itself will have to be updated in Avatica to be a little less brittle in this regard (I did not originally consider the implications that client/server might *have* the classes, but with a different name than what we had in Avatica).

Short term, we can undo the relocation of the Avatica classes in the thin-client and queryserver artifacts. I will be working on this post-haste. 



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