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From "Anoop Sam John (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-13387) Add ServerCell an extension to Cell
Date Wed, 08 Apr 2015 18:41:12 GMT

    [ https://issues.apache.org/jira/browse/HBASE-13387?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14485765#comment-14485765
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Anoop Sam John commented on HBASE-13387:
----------------------------------------

[~stack]  Pls note that, the getXXXArray APIs will throw Exception in case of buffer backed
Cells.  So writers of Filter/CP has to do the instance of check always.  
Yes we must give CellUtil APIs for retrieving the values or check the qualifier etc for a
Cell.  The util can do type check and all.. This can take the pain from users.
If we are not having the restriction of getXXXArray() APIs throwing Exception in case of buffer
backed cells, it looks ok to pass Cell only to Filter/CPs.  If writer calls them with out
type check and all,  there is a pref hit but functionally no issue.  Giving the CellUtil APIs
we can help users of doing this in better way.

In that regard (and also considering we are not leaking new APIs in public Cell API), can
we have separate getXXXOffset() methods for getting offset in buffer?  This was discussed
in dev@ mail chain.  In a public Cell API this looks ugly but on a ServerCell this is fine?

> Add ServerCell an extension to Cell
> -----------------------------------
>
>                 Key: HBASE-13387
>                 URL: https://issues.apache.org/jira/browse/HBASE-13387
>             Project: HBase
>          Issue Type: Sub-task
>          Components: regionserver, Scanners
>            Reporter: Anoop Sam John
>            Assignee: Anoop Sam John
>         Attachments: WIP_ServerCell.patch
>
>
> This came in btw the discussion abt the parent Jira and recently Stack added as a comment
on the E2E patch on the parent Jira.
> The idea is to add a new Interface 'ServerCell'  in which we can add new buffer based
getter APIs, hasArray API etc.  We will keep this interface @InterfaceAudience.Private
> Also we have to change the timestamp and seqId on Cells in server side. We have added
new interfaces SettableSequenceId, SettableTimestamp for this. Now if we can add a ServerCell
we can add the setter APIs there.



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