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From "Lars Hofhansl (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-6427) Pluggable compaction policies via coprocessors
Date Thu, 26 Jul 2012 19:42:35 GMT

    [ https://issues.apache.org/jira/browse/HBASE-6427?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13423384#comment-13423384
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Lars Hofhansl commented on HBASE-6427:
--------------------------------------

Of course this has to be compared to simply making the ScanInfo pluggable in Store.java. 

What I want to achieve here is to have an external process (backup tool, transaction engine,
etc) to be able to override HBase's default TTL/#Versions with very high fidelity (i.e. not
via a dynamic schema change, which is too heavyweight/slow).

The coprocessor approach is nice, because it provides a lot of flexibility for other future
use cases and it does not invent a new concept. At the same time it adds complexity.

                
> 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
>            Priority: Minor
>         Attachments: 6427-notReady.txt, 6427-v1.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.
> 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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