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From "Sergey Shelukhin (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-7842) Add compaction policy that explores more storefile groups
Date Fri, 05 Apr 2013 20:27:17 GMT

    [ https://issues.apache.org/jira/browse/HBASE-7842?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13624029#comment-13624029
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Sergey Shelukhin commented on HBASE-7842:
-----------------------------------------

I thought inheritance would be the other way around :) anyway, LGTM

+1
                
> Add compaction policy that explores more storefile groups
> ---------------------------------------------------------
>
>                 Key: HBASE-7842
>                 URL: https://issues.apache.org/jira/browse/HBASE-7842
>             Project: HBase
>          Issue Type: New Feature
>          Components: Compaction
>            Reporter: Elliott Clark
>            Assignee: Elliott Clark
>         Attachments: HBASE-7842-0.patch, HBASE-7842-2.patch, HBASE-7842-3.patch, HBASE-7842-4.patch,
HBASE-7842-5.patch, HBASE-7842-6.patch
>
>
> Some workloads that are not as stable can have compactions that are too large or too
small using the current storefile selection algorithm.
> Currently:
> * Find the first file that Size(fi) <= Sum(0, i-1, FileSize(fx))
> * Ensure that there are the min number of files (if there aren't then bail out)
> * If there are too many files keep the larger ones.
> I would propose something like:
> * Find all sets of storefiles where every file satisfies 
> ** FileSize(fi) <= Sum(0, i-1, FileSize(fx))
> ** Num files in set =< max
> ** Num Files in set >= min
> * Then pick the set of files that maximizes ((# storefiles in set) / Sum(FileSize(fx)))
> The thinking is that the above algorithm is pretty easy reason about, all files satisfy
the ratio, and should rewrite the least amount of data to get the biggest impact in seeks.

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