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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 04:07:12 GMT

    [ https://issues.apache.org/jira/browse/HBASE-13387?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14484675#comment-14484675

Anoop Sam John commented on HBASE-13387:

Thanks Stack.
Why is ServerCell showing up in the client package? (BigDecimalColumnInterpreter, etc)
Used in getValue() . This is because this method is been used in Server side as well.(AggregateImplementation)
  We get the ServerCell in the read path and that is what we pass to this API in server side
bq. Whey does createCell create a ServerCell? I'd think it'd create a Cell. If I wanted a
servercell I'd do createServerCell?
Yes I can add as a new API. That will be cleaner.
bq.Why do all the compares take ServerCell now rather than just Cell? I'd think ServerCell
an implementation detail not to show up on methods generally.
Compares are mostly used in server side read path right. We have ServerCell passing through
the read path.  Also when we have the BB backed Cells, we have to use getXXXBuffer APIs in
the comparators rather than the getXXXArray APIs.  These buffer based APIs will be available
only in ServerCell.  So we have to pass ServerCell to the Comparators. May be we can have

bq.Sounds like we might also want to have a ReadServerCell that might be different to WriteServerCell
going by recent back and forth.
Might not be really.. (atleast as of now.)

> 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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