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From "Edward Yoon (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-2021) Sort Join Implementation
Date Sun, 18 Nov 2007 03:15:43 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-2021?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12543333
] 

Edward Yoon commented on HADOOP-2021:
-------------------------------------

But, Can not insert duplicate key row in hbase table.
so........

r3
               a  b  c  e  f
===========================
row1.row4   a1 b1 c1 e1 a1
row1.row4   a1 b1 c1 e4 a1

hmm. 
is it all right in theory ??

I need a any advice.

> Sort Join Implementation
> ------------------------
>
>                 Key: HADOOP-2021
>                 URL: https://issues.apache.org/jira/browse/HADOOP-2021
>             Project: Hadoop
>          Issue Type: Sub-task
>          Components: contrib/hbase
>    Affects Versions: 0.14.1
>         Environment: all environments  
>            Reporter: Edward Yoon
>            Priority: Minor
>             Fix For: 0.16.0
>
>         Attachments: 2021_v01.patch
>
>
> If we don't have an index for a domain in the join, we can still improve on the nested-loop
join using sort join.
> {code}
> R1 = table('movieLog_table');
> R2 = table('stockCompany_info');
> result = R1.join(R1.studioName = R2.corporation) and R2;
> {code}

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