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From "Andrew Purtell (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-10321) CellCodec has broken the 96 client to 98 server compatibility
Date Mon, 13 Jan 2014 08:08:52 GMT

    [ 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:
----------------------------------------

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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