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https://issues.apache.org/jira/browse/HDFS-15790?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17278864#comment-17278864
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David Mollitor commented on HDFS-15790:
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OK. This looks OK with me.
As I said, in my original issue, both engines were loaded into the same JVM and
they would both fight at the point of registration. It looks like things are
now setup that they both register in the same static way and they don't explode
when they both register. Thanks.
> Make ProtobufRpcEngineProtos and ProtobufRpcEngineProtos2 Co-Exist
> ------------------------------------------------------------------
>
> Key: HDFS-15790
> URL: https://issues.apache.org/jira/browse/HDFS-15790
> Project: Hadoop HDFS
> Issue Type: Improvement
> Reporter: David Mollitor
> Assignee: David Mollitor
> Priority: Major
> Labels: pull-request-available
> Time Spent: 50m
> Remaining Estimate: 0h
>
> Changing from Protobuf 2 to Protobuf 3 broke some stuff in Apache Hive
> project. This was not an awesome thing to do between minor versions in
> regards to backwards compatibility for downstream projects.
> Additionally, these two frameworks are not drop-in replacements, they have
> some differences. Also, Protobuf 2 is not deprecated or anything so let us
> have both protocols available at the same time. In Hadoop 4.x Protobuf 2
> support can be dropped.
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