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https://issues.apache.org/jira/browse/HBASE-7233?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13573288#comment-13573288
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Matt Corgan commented on HBASE-7233:
------------------------------------

One idea is to version the codecs like BasicCellEncoderV1, then if we want to 
add tags we make V2.  To avoid historical version explosion we apply the normal 
policy of only supporting upgrade over a single major release.  Just delete the 
old versions after that.
                
> Serializing KeyValues
> ---------------------
>
>                 Key: HBASE-7233
>                 URL: https://issues.apache.org/jira/browse/HBASE-7233
>             Project: HBase
>          Issue Type: Bug
>            Reporter: stack
>            Assignee: stack
>            Priority: Blocker
>             Fix For: 0.96.0
>
>         Attachments: 7233sketch.txt, 7233.txt, 7233v10.txt, 7233-v2.txt, 
> 7233v3_encoders.txt, 7233v4_encoders.txt, 7233v5_encoders.txt, 
> 7233v6_encoder.txt, 7233v7.txt, 7233v9.txt
>
>
> Undo KeyValue being a Writable.

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