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From "Lars Hofhansl (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-6427) Pluggable compaction policies via coprocessors
Date Mon, 30 Jul 2012 03:13:34 GMT

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Lars Hofhansl commented on HBASE-6427:
--------------------------------------

Also another thought: I wonder how hard it is to fold custom timestamps into this. An example
of what I mean is time dimension that uses monotonically increasing transaction numbers.
A slight API change to the StoreScanner constructor would make it possible to handle that
too: By passing in the absolute "time" at which a KV expires rather than the TTL (which it
then internally translates to an absolute time anyway, and which in turn depends on the RegionServer's
understanding of time, which is not configurable).

                
> 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, 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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