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From "Sergey Shelukhin (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-7902) deletes may be removed during minor compaction, in non-standard compaction schemes
Date Mon, 25 Feb 2013 23:26:14 GMT

    [ https://issues.apache.org/jira/browse/HBASE-7902?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13586459#comment-13586459
] 

Sergey Shelukhin commented on HBASE-7902:
-----------------------------------------

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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