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https://issues.apache.org/jira/browse/BOOKKEEPER-702?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13822281#comment-13822281
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Steve Loughran commented on BOOKKEEPER-702:
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could you paste in the discussion/explain why you don't want to move up 
protobuf? I know it's a traumatic migration because google broke the APIs, but 
as we did it for Hadoop and HBase in near lockstep it'd be good to have 
bookkeeper in sync

> Upgrade protobuf-java to 2.5.0 version
> --------------------------------------
>
>                 Key: BOOKKEEPER-702
>                 URL: https://issues.apache.org/jira/browse/BOOKKEEPER-702
>             Project: Bookkeeper
>          Issue Type: Improvement
>            Reporter: Rakesh R
>            Assignee: Rakesh R
>            Priority: Blocker
>             Fix For: 4.4.0
>
>         Attachments: 0001-BOOKKEEPER-702.patch, 0002-BOOKKEEPER-702.patch
>
>
> HDFS is using BK for the shared memory approach through BKJM plugin. 
> Presently HDFS is using Bookkeeper4.0.0 version and when tries to upgrade to 
> latest 4.2.2 version, there is a conflicts in protobuf versions between the 
> components. Latest HDFS 2.1 branch is using protobuf-java-2.5.0 version, but 
> BK has protobuf-java-2.4.1 version.



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