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https://issues.apache.org/jira/browse/HBASE-7763?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13573887#comment-13573887
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Elliott Clark commented on HBASE-7763:
--------------------------------------
For the bulk load scenario, sorting by size is very important. Take this
example: Bulk loads every hour of small files: (ratio 1.2, max 3 files, min 2)
[5000 20 20 20 20 20 ] The largest file is from compactions but has -1 as it's
seqNum. So we'll be compacting [ 500 20 20 ] then [5040 20 20] then [5080 20 20]
So I think we should always have a sort by size after the sort by seqid
comparator, in addition to configurable additions talked about above.
I've never seen a user put the same ts and expect to obscure the older one.
(Sample size of 1 and all)
But it seems like if we come up with something that's much better but have to
give up that one line in the ref guide. It would be a fair trade.
> Compactions not sorting based on size anymore.
> ----------------------------------------------
>
> Key: HBASE-7763
> URL: https://issues.apache.org/jira/browse/HBASE-7763
> Project: HBase
> Issue Type: Bug
> Components: Compaction
> Affects Versions: 0.96.0, 0.94.4
> Reporter: Elliott Clark
> Assignee: Elliott Clark
> Priority: Critical
> Fix For: 0.96.0, 0.94.6
>
> Attachments: HBASE-7763-trunk-TESTING.patch,
> HBASE-7763-trunk-TESTING.patch, HBASE-7763-trunk-TESTING.patch
>
>
> Currently compaction selection is not sorting based on size. This causes
> selection to choose larger files to re-write than are needed when bulk loads
> are involved.
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