-Re: How to join 2 tables using hadoop?
manishbhoge@...) 2013-07-22, 03:13
You can store json using map function to hive table. So once you write select query then you can use map function.
Once data retrived you can join with data on another table.
Sent via Rocket from my HTC
----- Reply message -----
From: "Pavan Sudheendra" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Subject: How to join 2 tables using hadoop?
Date: Sat, Jul 20, 2013 11:18 AM
If i have the value of a row in JSON format, would pig we able to
parse it and join the fields as per my needs?
On Fri, Jul 19, 2013 at 10:00 PM, Shahab Yunus <[EMAIL PROTECTED]> wrote:
> You can also look into Pig, if you already haven't. It supports various
> kinds of joins and is simpler than writing your own M/R job (assuming that
> you don't have complex or custom requirements.)
> On Fri, Jul 19, 2013 at 12:24 AM, Pavan Sudheendra <[EMAIL PROTECTED]>wrote:
>> I know that HBase by default doesn't support table joins like RDBMS..
>> But anyway, I have a table who value contains a json with a particular
>> ID in it..
>> This id references another table where it is a key..
>> I want to fetch the id first from table A , query table 2 and get its
>> corresponding value..
>> What is the best way of achieving this using the MR framework?
>> Apologizes, i'm still new to Hadoop and HBase so please go easy on me.
>> Thanks for any help