Hadoop to Oracle with Dynamic schema

Anonymous — Sat, 16 Nov 2024 08:50:37 GMT

Hi All,

I have the following scenario at hands :

I receive a flat file on a daily basis that is imported into HDFS.
This file has a variable amount of columns
I need to design a job that takes the data from this HDFS file, and populates an Oracle table.
This Oracle table will be dropped and recreated at every run due to the variable amount of columns
All datatypes can be defined as String (VARCHAR2) in the Oracle table. (As I think there's no way to 'guess' the datatypes at runtime from a CSV.

I've been breaking my head around the design, and have come up with the following design limitations at the moment.

Scenario 1
- tHDFSInput -> tOracleOutput
- I would be using the a 1 column schema of type 'Dynamic' to achieve this
- Issue : Type Dynamic is not supported by tHDFSInput
Scenario 2
- Script a Hive Create Table statement based on the header row of the hdfs file
- Create the external table pointing to the HDFS file
- tHiveInput -> tOracleOutput
- Issue : Type Dynamic is not supported by tHiveInput

Is there a trick to be able to use a Dynamic schema in Hive/HDFS components?

Or I there a better way all together to approach this design?

Thanks a lot for your input,

Kr,

Michael

Re: Hadoop to Oracle with Dynamic schema

Anonymous — Thu, 18 Jan 2018 20:54:22 GMT

In Scenario 2 , Build the select query dynamically using Hive Metastore for that table.

Anonymous — Mon, 22 Jan 2018 08:31:13 GMT

Hello,

Here is a new feature jira issue about "Support Hive Metastore HA".

Best regards

Sabrina