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From Stuti Awasthi <stutiawas...@hcl.com>
Subject RE: Hbase query
Date Thu, 18 Aug 2011 07:04:37 GMT
Thanks Buttler !

-----Original Message-----
From: Buttler, David [mailto:buttler1@llnl.gov] 
Sent: Wednesday, August 17, 2011 9:13 PM
To: user@hbase.apache.org
Subject: RE: Hbase query 

One way to do it would be to drop the sales_id and use a composite key of user_id/product_id
(assuming that a user may only by one product).  Then you could do a simple get("xyz/123")
to get the full row.  If you wanted to get the email of people who bought product "123", then
a row key of product/user might be more useful. Then you could scan starting at "123", ending
at "123\0".  

However, you need to ask the question: Since you already have an RDBMS that works, why do
you want to switch to HBase?  If it is because you have a lot of transaction data (really?
Main memory is getting pretty big these days...), maybe you want to store user info in the
RDBMS and just the transaction data in HBase.

Dave

-----Original Message-----
From: Stuti Awasthi [mailto:stutiawasthi@hcl.com]
Sent: Wednesday, August 17, 2011 8:19 AM
To: user@hbase.apache.org
Subject: Hbase query 

Hi all

I have read that Hbase query will depend on <Row-Key> only . I was trying to map my
tables of RDBMS to HBASE and was thinking way out for the following ?

RDBMS Schema :

Table Sales
Column:

*         Sales_Id (PK)

*         User_Id     (FK)

*         Product_ID (FK)

*         Name

*         Mobile

*         Email

Query : Select Name , Mobile, Email from Sales where User_id= "xyz" and Product_Id= "123"

This query is fairly simple in RDBMS because we can query based on columns. How to do this
efficiently in Hbase ?



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