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https://issues.apache.org/jira/browse/HBASE-7902?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13586459#comment-13586459
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Sergey Shelukhin commented on HBASE-7902:
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Hmm. I am starting to wonder about the semantics of this.
Compactions (including major) trigger at arbitrary time.
What if we have this put ts = 1 in memstore while we do the major compaction?
What if we write it 1 minute after delete ts = 2, and compaction already
happened?
> deletes may be removed during minor compaction, in non-standard compaction
> schemes
> -----------------------------------------------------------------------------------
>
> Key: HBASE-7902
> URL: https://issues.apache.org/jira/browse/HBASE-7902
> Project: HBase
> Issue Type: Improvement
> Components: Compaction
> Reporter: Sergey Shelukhin
> Assignee: Sergey Shelukhin
> Priority: Minor
> Attachments: HBASE-7902-v0.patch, HBASE-7902-v0-with-7843.patch
>
>
> Deletes are only removed during major compaction now. However, in presence of
> file ordering, deletes can be removed during minor compaction too, as long as
> there's no file that is not being compacted that is older than the files that
> are.
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