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From "Lars Hofhansl (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-5229) Explore building blocks for "multi-row" local transactions.
Date Sun, 05 Feb 2012 01:08:53 GMT

    [ https://issues.apache.org/jira/browse/HBASE-5229?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13200616#comment-13200616
] 

Lars Hofhansl commented on HBASE-5229:
--------------------------------------

Is there still general trepidation around this?
The patch is very lightweight and does not change any existing functionality. With HBASE-5304
it can be quite helpful to provide local transaction to help in multi-tenant settings.

We can possibly call out the "advancedness" of this feature, maybe by having an "advanced
htable" (or something like this). Not sure that is worth splitting the API, though.
                
> Explore building blocks for "multi-row" local transactions.
> -----------------------------------------------------------
>
>                 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-multiRow-v2.txt, 5229-multiRow.txt, 5229-seekto-v2.txt, 5229-seekto.txt,
5229.txt
>
>
> HBase should provide basic building blocks for multi-row local transactions. Local means
that we do this by co-locating the data. Global (cross region) transactions are not discussed
here.
> After a bit of discussion two solutions have emerged:
> 1. Keep the row-key for determining grouping and location and allow efficient intra-row
scanning. A client application would then model tables as HBase-rows.
> 2. Define a prefix-length in HTableDescriptor that defines a grouping of rows. Regions
will then never be split inside a grouping prefix.
> #1 is true to the current storage paradigm of HBase.
> #2 is true to the current client side API.
> I will explore these two with sample patches here.
> --------------------
> Was:
> 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
somewhere.
> Let's use this jira for discussion, I'll attach a patch (with tests) momentarily to make
this concrete.

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