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From Maulik Gandhi <mmg...@gmail.com>
Subject Re: Want to Add New Column in Avro Schema
Date Wed, 23 Mar 2016 13:42:43 GMT
You can try describe tableName; and see if the new added column appears in
Hive table.

Thanks.
- Maulik


On Wed, Mar 23, 2016 at 8:38 AM, Aaron.Dossett <Aaron.Dossett@target.com>
wrote:

> And what happens if you simply update the .avsc file on HDFS?  Does
> ‘describe test’ show the new columns?
>
> From: "Lunagariya, Dhaval" <dhaval.lunagariya@citi.com>
> Reply-To: "user@avro.apache.org" <user@avro.apache.org>
> Date: Wednesday, March 23, 2016 at 8:29 AM
>
> To: "user@avro.apache.org" <user@avro.apache.org>
> Cc: "'er.dcpatel@gmail.com'" <er.dcpatel@gmail.com>
> Subject: RE: Want to Add New Column in Avro Schema
>
> Here is the DDL.
>
>
>
> DROP TABLE IF EXISTS TEST;
>
>
>
> CREATE EXTERNAL TABLE TEST
>
> PARTITIONED BY (
>
> COL1 STRING,
>
> COL2 STRING
>
> )
>
> ROW FORMAT SERDE 'org.apache.hadoop.hive.serde2.avro.AvroSerDe'
>
> STORED AS
>
> INPUTFORMAT 'org.apache.hadoop.hive.ql.io.avro.AvroContainerInputFormat'
>
> OUTPUTFORMAT 'org.apache.hadoop.hive.ql.io.avro.AvroContainerOutputFormat'
>
> LOCATION 'hdfs:///data/hive/TEST'
>
> TBLPROPERTIES ('avro.schema.url'='hdfs:///user/Test.avsc');
>
>
>
> Thanks,
>
> Dhaval
>
>
>
> *From:* Aaron.Dossett [mailto:Aaron.Dossett@target.com
> <Aaron.Dossett@target.com>]
> *Sent:* Wednesday, March 23, 2016 6:50 PM
> *To:* user@avro.apache.org
> *Cc:* 'er.dcpatel@gmail.com'
> *Subject:* Re: Want to Add New Column in Avro Schema
>
>
>
> You shouldn’t have to drop the table, just update the .avsc.  Can you
> share the DDL you use to create the table?
>
>
>
> *From: *"Lunagariya, Dhaval" <dhaval.lunagariya@citi.com>
> *Reply-To: *"user@avro.apache.org" <user@avro.apache.org>
> *Date: *Wednesday, March 23, 2016 at 8:17 AM
> *To: *"user@avro.apache.org" <user@avro.apache.org>
> *Cc: *"'er.dcpatel@gmail.com'" <er.dcpatel@gmail.com>
> *Subject: *RE: Want to Add New Column in Avro Schema
>
>
>
> Yes. I made require changes in .avsc file and I drop the table and
> re-created using updated .avsc. But I am not getting existing data in that
> case.
>
>
>
> Where am I wrong? Can you through some light
>
>
>
> Thanks,
>
> Dhaval
>
>
>
> *From:* Aaron.Dossett [mailto:Aaron.Dossett@target.com
> <Aaron.Dossett@target.com>]
> *Sent:* Wednesday, March 23, 2016 6:36 PM
> *To:* user@avro.apache.org
> *Cc:* 'er.dcpatel@gmail.com'
> *Subject:* Re: Want to Add New Column in Avro Schema
>
>
>
> If you create the external table by reference to the .avsc file
> (TBLPROPERTIES ( 'avro.schema.url’=‘hdfs://foo.avsc')) the all you have to
> do is update that avsc file in a compatible way and Hive should reflect the
> new schema.  I’ve implemented this pattern in my production system for
> several months now.
>
>
>
> -Aaron
>
>
>
> *From: *"Lunagariya, Dhaval" <dhaval.lunagariya@citi.com>
> *Reply-To: *"user@avro.apache.org" <user@avro.apache.org>
> *Date: *Wednesday, March 23, 2016 at 6:32 AM
> *To: *"user@avro.apache.org" <user@avro.apache.org>
> *Cc: *"'er.dcpatel@gmail.com'" <er.dcpatel@gmail.com>
> *Subject: *Want to Add New Column in Avro Schema
>
>
>
> Hey folks,
>
>
>
> I want to add new column in existing Hive Table. We created external hive
> table with the help of .avsc. Now I want to add new column in that table.
>
>
>
> How can I do that without disturbing any data present in table?
>
>
>
> Please Help.
>
>
>
> Regards,
>
> Dhaval
>
>
>

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