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From "Matt Corgan (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-5229) Support atomic region operations
Date Thu, 19 Jan 2012 23:21:39 GMT

    [ https://issues.apache.org/jira/browse/HBASE-5229?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13189487#comment-13189487

Matt Corgan commented on HBASE-5229:

I think the approach of expanding and improving support for gigantic rows would be cleaner
than adding another consistency guarantee to hbase's feature list.  Combining very wide rows
with many column families, each with separate settings and compactions provides a good framework
for all sorts of different data models on top.  You could let a row become so big that it's
the only row on a machine if you want.

>From what I can tell from papers and presentations, BigTable actually supports many gigabyte
EntityGroups.  They mention it at 6:18 in this video: http://www.youtube.com/watch?v=xO015C3R6dw
.  I'm not sure how "Entity Groups can span machines and still enforce transactionality".
 I had thought that an entity group was confined to a single BigTable row, maybe that means
they do span BigTable regions.  Anyone know how that works?

> Support atomic region operations
> --------------------------------
>                 Key: HBASE-5229
>                 URL: https://issues.apache.org/jira/browse/HBASE-5229
>             Project: HBase
>          Issue Type: New Feature
>          Components: client, regionserver
>            Reporter: Lars Hofhansl
>            Assignee: Lars Hofhansl
>             Fix For: 0.94.0
>         Attachments: 5229.txt
> As discussed (at length) on the dev mailing list with the HBASE-3584 and HBASE-5203 committed,
supporting atomic cross row transactions within a region becomes simple.
> I am aware of the hesitation about the usefulness of this feature, but we have to start
> Let's use this jira for discussion, I'll attach a patch (with tests) momentarily to make
this concrete.

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