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From "Enis Soztutar (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-13991) Hierarchical Layout for Humongous Tables
Date Wed, 01 Jul 2015 00:52:05 GMT

    [ https://issues.apache.org/jira/browse/HBASE-13991?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14609376#comment-14609376
] 

Enis Soztutar commented on HBASE-13991:
---------------------------------------

I don't like introducing a concept of "humongous tables". I can definitely understand that
you wanted to get the layout changes without affecting other users, but adding another switch
is not the way to go for operational concerns. If we are doing a layout change, we should
do it for all the tables, and find a way to handle migrations automatically, etc. 

What other areas that a "humongous table" differ from a regular table? What happens if a table
starts as a regular table, then becomes humongous? 

I like where this is going. Sorry, [~benlau] this might again turn into a bigger re-architect
some parts kind of jira instead of a simpler patch. But I agreed with Stack and Matteo that
we should take a holistic view. 

See: 
https://issues.apache.org/jira/browse/HBASE-7806?focusedCommentId=13594284&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-13594284

HBASE-13159 also talks about unifying reference files / file links and snapshot files so that
the soft links is much easier to maintain.  


> Hierarchical Layout for Humongous Tables
> ----------------------------------------
>
>                 Key: HBASE-13991
>                 URL: https://issues.apache.org/jira/browse/HBASE-13991
>             Project: HBase
>          Issue Type: Sub-task
>            Reporter: Ben Lau
>            Assignee: Ben Lau
>         Attachments: HBASE-13991-master.patch, HumongousTableDoc.pdf
>
>
> Add support for humongous tables via a hierarchical layout for regions on filesystem.
 
> Credit for most of this code goes to Huaiyu Zhu.  
> Latest version of the patch is available on the review board: https://reviews.apache.org/r/36029/



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