Hello Selvam,

You can use a single maptask (no split).  If you are ingesting from Oracle you can us --direct which does not use column keys to generate splits.

Thanks, Markus

On Sep 25, 2016, at 10:14, Selvam Raman <selmna@gmail.com> wrote:

I have 1 TB of data in databse. Primary key are alphanumeric.
Now how can I use sqoop.

Is it possible to use sqoop to import.

Thanks,
Selvam R
+91-97877-87724

On Sep 23, 2016 3:17 PM, "Markus Kemper" <markus@cloudera.com> wrote:
As Ravi noted, non-numeric keys are not reliable and can result in both duplicate as well as missing rows.  When using a non-numeric key for split-by you should observe a warning in the debug console output.


Markus Kemper
Customer Operations Engineer
 www.cloudera.com


On Fri, Sep 23, 2016 at 10:11 AM, Ravi, Chandramouli <Chandramouli.Ravi@vantiv.com> wrote:

It won't work well when Primary key is alpha numeric. I think data will be skewed or won't come back as expected creating non-balanced split files.

Specify different numeric index as Split key if numeric primary key is not present.

 

From: Selvam Raman [mailto:selmna@gmail.com]
Sent: Friday, September 23, 2016 10:09 AM
To: user@sqoop.apache.org
Subject: sqoop import for UUID(primary key)

 

Hi,

 

In Sqoop If i am having primary key (Number value) and number of parallel task then it will work (max-min/number of task), to pull the data from table to hdfs.

 

suppose if i have the primary key as UUID(alpha numeric value), how the load will be distributed.

 

Thank you for your help.

 

--

Selvam Raman
"லஞ்சம் தவிர்த்து நெஞ்சம் நிமிர்த்து"


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