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From "Jingcheng Du (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-12669) Have compaction scanner save info about deleted mob cells
Date Mon, 22 Dec 2014 03:17:13 GMT

    [ https://issues.apache.org/jira/browse/HBASE-12669?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14255378#comment-14255378
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Jingcheng Du commented on HBASE-12669:
--------------------------------------

What cells will output from the scanners? Both the deleted cells and delete markers, right?
These deleted cells are saved in the del files, and the del files are scanned to find where
these deleted cells come from. And these files need to join the scanning when to rewrite the
new mob files in the mob compaction. So it's better to have the both of deleted cells and
delete markers in the del files. Please advise. Thanks.

> Have compaction scanner save info about deleted mob cells
> ---------------------------------------------------------
>
>                 Key: HBASE-12669
>                 URL: https://issues.apache.org/jira/browse/HBASE-12669
>             Project: HBase
>          Issue Type: Sub-task
>          Components: regionserver, Scanners
>            Reporter: Jonathan Hsieh
>            Assignee: Jingcheng Du
>             Fix For: hbase-11339
>
>
> for the native mob compaction, we will need a scanner pass used by minor and major compactions
that record the cells with references to mobs that have been deleted.  This would implement
that core section.



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