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https://issues.apache.org/jira/browse/HDFS-15790?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17273799#comment-17273799
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David Mollitor commented on HDFS-15790:
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Thanks [~vinayakumarb]. I don't mind adding this new capability, but it broke
backwards compatibility of a public class. Thanks for taking a look. I hope
this can be considered an add-on and not a replacement.
> 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: 40m
> 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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