[jira] [Commented] (HADOOP-17046) Support downstreams' existing Hadoop-rpc implementations using non-shaded protobuf classes.

["Steve Loughran (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HADOOP-17046?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17616593#comment-17616593 ] 

Steve Loughran commented on HADOOP-17046:
-----------------------------------------

given ozone depends on RPC, can you update the package-info to record this fact. especially as I am exploring what would break if the unshaded protobuf 2.5 jar was downgraded to provided in the maven builds, and then left out of hadoop common lib : HADOOP-18487



> Support downstreams' existing Hadoop-rpc implementations using non-shaded protobuf classes.
> -------------------------------------------------------------------------------------------
>
>                 Key: HADOOP-17046
>                 URL: https://issues.apache.org/jira/browse/HADOOP-17046
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: rpc-server
>    Affects Versions: 3.3.0
>            Reporter: Vinayakumar B
>            Assignee: Vinayakumar B
>            Priority: Major
>             Fix For: 3.3.0
>
>
> After upgrade/shade of protobuf to 3.7 version, existing Hadoop-Rpc client-server implementations using ProtobufRpcEngine will not work.
> So, this Jira proposes to keep existing ProtobuRpcEngine as-is (without shading and with protobuf-2.5.0 implementation) to support downstream implementations.
> Use new ProtobufRpcEngine2 to use shaded protobuf classes within Hadoop and later projects who wish to upgrade their protobufs to 3.x.



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