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From "Edward Yoon (JIRA)" <j...@apache.org>
Subject [jira] Issue Comment Edited: (HADOOP-1608) [Hbase Shell] Relational Algrebra Operators
Date Sat, 13 Oct 2007 10:08:50 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-1608?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12534493
] 

udanax edited comment on HADOOP-1608 at 10/13/07 3:07 AM:
---------------------------------------------------------------

>> The hadoop trunk is about to be branched in preparation for the hadoop 0.15.0 release.
Its to happen any day now. Meantime, we are trying to hold off committing big new features.

Yeah, I finally understood perfectly.  (sorry on my clumsy english and versioning)
Thanks, St.Ack

>> When you say in 'network mode', do you mean distributed?

Yes. When running on 4 node cluster, I recieve "User classes may not be found" error message.
So, I used setJar() method. 

      was (Author: udanax):
    >> When you say in 'network mode', do you mean distributed?

Yes. 
When running on 4 node cluster, I recieve "User classes may not be found" error message.
So, I used setJar() method.
  
> [Hbase Shell] Relational Algrebra Operators
> -------------------------------------------
>
>                 Key: HADOOP-1608
>                 URL: https://issues.apache.org/jira/browse/HADOOP-1608
>             Project: Hadoop
>          Issue Type: Improvement
>          Components: contrib/hbase
>    Affects Versions: 0.14.1
>         Environment: All environments 
>            Reporter: Edward Yoon
>            Priority: Minor
>             Fix For: 0.16.0
>
>         Attachments: patch_v01.txt, patch_v02.txt, patch_v03.txt, patch_v04.txt, patch_v05.txt,
patch_v06.txt, patch_v07.txt, patch_v08.txt, patch_v09.txt, patch_v10.txt, patch_v11.txt
>
>
> Development of relational algebra operators has begun.
>  * Projection 
>   ** selects a subset of the columnfamilies of a relation  
>   ** Result = π ~column_list~ (Relation) 
> {code}
> Hbase > Result = Relation.Projection('year','legnth');
> Hbase > save Result into table('result');
> {code}
>  * Selection
>   ** See : HADOOP-2003 issue's description
> {code}
> Hbase > Result = Relation.Selection(length > 100 and studioName = 'Fox'); 
> Hbase > save Result into table('result');
> {code}
>  * Group
>   ** more details about 'GROUP' operation will be handled in HADOOP-1658 issue. 
>  * θ Join
>  ** The join of two relations R1(A ~1~,A ~2~,...,A ~n~) and R2(B~1~,B~2~,...,B~m~) is
a relation with degree k=n+m and attributes (A ~1~,A ~2~,...,A ~n~, B ~1~,B ~2~,...,B ~m~)
that satisfy the join condition
> {code}
> Hbase > R1 = table('movieLog_table');
> Hbase > R2 = table('personInfo_table');
> Hbase > Result = R1.join(R1.producer: = R2.ROW) and R2; or Result = R1.join(R1.actor:hero
= R2.Row) and R2;
> {code}

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