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From "Matt Corgan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-7902) deletes may be removed during minor compaction, in non-standard compaction schemes
Date Tue, 26 Feb 2013 06:52:14 GMT

    [ https://issues.apache.org/jira/browse/HBASE-7902?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13586873#comment-13586873
] 

Matt Corgan commented on HBASE-7902:
------------------------------------

{quote}The problem here would be the Delete in a store file and a Put with an older timestamp
in the memstore.{quote}I wish the BigTable paper didn't suggest this was an appropriate use
case.  Probably too late to rethink now, but seems contrary to the whole LSM architecture.
                
> 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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