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From "Andrew Purtell (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-6427) Pluggable compaction policies via coprocessors
Date Sat, 28 Jul 2012 22:46:34 GMT

    [ https://issues.apache.org/jira/browse/HBASE-6427?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13424451#comment-13424451
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Andrew Purtell commented on HBASE-6427:
---------------------------------------

Then you want to restore this behavior:
{noformat}
// NULL scanner returned from coprocessor hooks means skip normal processing
{noformat}

Can that work? 

I'd not be opposed to adding additional hooks but that should be after exhausting other options
here, IMHO, since they would be "close" to each other.

We could pass in the default StoreScanner. The hook could just return it if wanting default
behavior. Might need to make StoreScanner lazy, move initialization out of the constructor.
I'm remote and just have your patch to go by at the moment.
                
> Pluggable compaction 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
>         Attachments: 6427-notReady.txt, 6427-v1.txt, 6427-v2.txt, 6427-v3.txt, 6427-v4.txt,
6427-v5.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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