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From "Mikhail Bautin (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-6371) [89-fb] Level based compaction
Date Fri, 31 Aug 2012 20:22:09 GMT

    [ https://issues.apache.org/jira/browse/HBASE-6371?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13446331#comment-13446331
] 

Mikhail Bautin commented on HBASE-6371:
---------------------------------------

Ted: we have been reusing the same JIRA for 89-fb and trunk commits for a lot of features.
I think it is up to the developer of a particular feature to decide whether to use the same
JIRA or different JIRAs.
                
> [89-fb] Level based compaction
> ------------------------------
>
>                 Key: HBASE-6371
>                 URL: https://issues.apache.org/jira/browse/HBASE-6371
>             Project: HBase
>          Issue Type: Improvement
>            Reporter: Akashnil
>            Assignee: Akashnil
>
> Currently, the compaction selection is not very flexible and is not sensitive to the
hotness of the data. Very old data is likely to be accessed less, and very recent data is
likely to be in the block cache. Both of these considerations make it inefficient to compact
these files as aggressively as other files. In some use-cases, the access-pattern is particularly
obvious even though there is no way to control the compaction algorithm in those cases.
> In the new compaction selection algorithm, we plan to divide the candidate files into
different levels according to oldness of the data that is present in those files. For each
level, parameters like compaction ratio, minimum number of store-files in each compaction
may be different. Number of levels, time-ranges, and parameters for each level will be configurable
online on a per-column family basis.

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