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From "Andrew Purtell (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-7233) Serializing KeyValues
Date Thu, 07 Feb 2013 19:27:15 GMT

    [ https://issues.apache.org/jira/browse/HBASE-7233?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13573823#comment-13573823
] 

Andrew Purtell commented on HBASE-7233:
---------------------------------------

Yeah I guess there is a little bit of confusion here. I was thinking Cell can support getting
tag data, and the encoders might not support it (v1) or could (v2).

Should tags be a concern of Cell or KV? 

As maybe an interesting consideration, I only need tags in on disk representation and actually
should not send the ones I'd be working with over the wire to the client.

bq. I think Andy has found a way to work the tags into the current KeyValue serialization

I did, but it is ugly IMHO: I store the value length as negative, prepend delimited tag data
to the user value data, and parse the tags into in-memory metadata and fix up offsets on KV
instantiation. Do we actually want this? If so, then I guess we can have tagged KVs mixed
with old KVs in a backwards compatible way.
                
> 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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