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From "Andrew Purtell (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-6427) Pluggable compaction and scan policies via coprocessors
Date Mon, 30 Jul 2012 23:38:34 GMT

    [ https://issues.apache.org/jira/browse/HBASE-6427?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13425387#comment-13425387
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Andrew Purtell commented on HBASE-6427:
---------------------------------------

We don't want to just yank out CP APIs, but a liberal attitude toward deprecating and removing
them is fine IMO. The contract is different than with a public API. Furthermore, the interfaces
haven't gelled yet. We're just starting to get interesting use cases.
                
> Pluggable compaction and scan policies via coprocessors
> -------------------------------------------------------
>
>                 Key: HBASE-6427
>                 URL: https://issues.apache.org/jira/browse/HBASE-6427
>             Project: HBase
>          Issue Type: New Feature
>            Reporter: Lars Hofhansl
>            Assignee: Lars Hofhansl
>            Priority: Minor
>             Fix For: 0.96.0, 0.94.2
>
>         Attachments: 6427-notReady.txt, 6427-v1.txt, 6427-v10.txt, 6427-v2.txt, 6427-v3.txt,
6427-v4.txt, 6427-v5.txt, 6427-v7.txt
>
>
> When implementing higher level stores on top of HBase it is necessary to allow dynamic
control over how long KVs must be kept around.
> Semi-static config options for ColumnFamilies (# of version or TTL) is not sufficient.
> This can be done with a few additional coprocessor hooks, or by makeing Store.ScanInfo
pluggable.
> Was:
> The simplest way to achieve this is to have a pluggable class to determine the smallestReadpoint
for Region. That way outside code can control what KVs to retain.

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