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https://issues.apache.org/jira/browse/HBASE-10321?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13869350#comment-13869350
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Andrew Purtell commented on HBASE-10321:
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Another alternative is to also make CellCodec incapable of handling tags but
backwards compatible also, and add *another* codec which can handle tags. Call
it CellCodecV2 or whatever.
> CellCodec has broken the 96 client to 98 server compatibility
> -------------------------------------------------------------
>
> Key: HBASE-10321
> URL: https://issues.apache.org/jira/browse/HBASE-10321
> Project: HBase
> Issue Type: Bug
> Affects Versions: 0.98.0
> Reporter: Anoop Sam John
> Assignee: Anoop Sam John
> Priority: Blocker
> Fix For: 0.98.0, 0.99.0
>
> Attachments: HBASE-10321.patch
>
>
> The write/read tags added in CellCodec has broken the 96 client to 98 server
> compatibility (and 98 client to 96 server)
> When 96 client CellCodec writes cell, it won't write tags part at all. But
> the server expects a tag part, at least a 0 tag length. This tag length read
> will make a read of some bytes from next cell!
> I suggest we can remove the tag part from CellCodec. This codec is not used
> by default and I don't think some one will change to CellCodec from the
> default KVCodec now. ..
> This makes tags not supported via CellCodec..Tag support can be added to
> CellCodec once we have Connection negotiation in place (?)
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