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From "Jingcheng Du (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-11646) Handle the MOB in compaction
Date Fri, 15 Aug 2014 09:22:18 GMT

     [ https://issues.apache.org/jira/browse/HBASE-11646?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jingcheng Du updated HBASE-11646:
---------------------------------

    Attachment: HBASE-11646.diff

The threshold might be changed.
After that, some cells in the mob files need to be added back to HBase store file, some cells
in the HBase store files needs to be added to mob files. These are done in the HBase compaction.
And it's implemented in this patch.

> 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
>         Attachments: HBASE-11646.diff
>
>
> 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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