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https://issues.apache.org/jira/browse/HBASE-7763?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13572592#comment-13572592
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Sergey Shelukhin commented on HBASE-7763:
-----------------------------------------
I am reading the patch... meanwhile, one consideration that I somehow forgot
when reviewing the original is that you cannot select non-contiguous sequence
of files (by seqNum) for compaction currently, given that during reads the
preference of which file to read from is established by file seqNums
(KeyValueHeap::KVScannerComparator::compare). So if selection is re-sorted
someone still needs to ensure it's contiguous.
> 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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