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From "Jingcheng Du (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-11646) Handle the MOB in compaction
Date Wed, 06 Aug 2014 02:22:13 GMT

    [ https://issues.apache.org/jira/browse/HBASE-11646?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14087140#comment-14087140
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Jingcheng Du commented on HBASE-11646:
--------------------------------------

[~jmhsieh] Thanks Jon for the descriptions.
for the case#1, if a threshold is set larger, do we need to save the mob data back to the
HBase? Or just leave them in the mob files?

> Handle the MOB in compaction
> ----------------------------
>
>                 Key: HBASE-11646
>                 URL: https://issues.apache.org/jira/browse/HBASE-11646
>             Project: HBase
>          Issue Type: Sub-task
>          Components: Compaction
>            Reporter: Jingcheng Du
>            Assignee: Jingcheng Du
>
> In the updated MOB design however, admins can set CF level thresholds that would force
cell values > the threshold to use the MOB write path instead of the traditional path.
 There are two cases where mobs need to interact with this threshold
> 1) How do we handle the case when the threshold size is changed?
> 2) Today, you can bulkload hfiles that contain MOBs.  These cells will work as normal
inside hbase.  Unfortunately the cells with MOBs in them will never benefit form the MOB write
path.
> The proposal here is to modify compaction in mob enabled cf's such that the threshold
value is honored with compactions.  This handles case #1 -- elements that should be moved
out of the normal hfiles get 'compacted' into refs and mob hfiles, and values that should
be pulled into the cf get derefed and written out wholy in the compaction.  For case #2, we
can maintain the same behavior and compaction would move data into the mob writepath/lifecycle.



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