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From Gwen Shapira <gshap...@cloudera.com>
Subject Re: How does sqoop export detect Avro schema?
Date Mon, 02 Mar 2015 17:30:54 GMT
I'm pretty sure we support Avro exports, otherwise we wouldn't have
JIRAs like this:


On Sun, Mar 1, 2015 at 6:13 PM, Venkat Ranganathan
<vranganathan@hortonworks.com> wrote:
> If you are exporting from a hdfs location the default is text file format.
> I don’t think we support export to any other format than text using the
> —export-dir option (on the import side you could use —as-avrodatafile for
> avro like other files).
> But you can use the —hcatalog-table option to export a hive table without
> worrying about the storage location or format.
> Venkat
> From: Mark Grover
> Reply-To: "user@sqoop.apache.org"
> Date: Sunday, March 1, 2015 at 4:30 PM
> To: "user@sqoop.apache.org"
> Subject: Re: How does sqoop export detect Avro schema?
> Forgot to mention, here's the error I am getting:
> https://gist.github.com/markgrover/113196fecd1ec5bd0b38
> And, please include me on cc. I am not on the list. Thanks again!
> On Sun, Mar 1, 2015 at 4:29 PM, Mark Grover <mark@apache.org> wrote:
>> Hi Sqoop folks,
>> I am trying to better understand how sqoop export works.
>> In the sqoop export command, we don't put any information about the
>> metadata of the HDFS data being exported. So, how does sqoop figure out the
>> avro schema of the data being exported?
>> Does it use Kite's .metadata directory for this? If so, that'd mean you
>> can't export data not populated by Kite. I don't think that's the case.
>> Does it parse our the file header or look at file extensions? If so, that
>> doesn't work, I just populated an hive table which stores data in avro, and
>> it's file extension is not avro.
>> Does it do something else that I am missing?
>> I created a Hive avro table using some new syntax supported in Hive 0.14+:
>> CREATE EXTERNAL TABLE avg_movie_rating2(movie_id INT, rating DOUBLE)
>> LOCATION '/data/movielens/aggregated_ratings'
>> And, I just haven't been able to get Sqoop to be able to export that data.
>> Here's the sqoop export command that I ran:
>> sqoop export --connect \
>> jdbc:mysql://mgrover-haa-2.vpc.cloudera.com:3306/movie_dwh \
>> --username root --table avg_movie_rating --export-dir \
>> /data/movielens/aggregated_ratings -m 16 \
>> --update-key movie_id --update-mode allowinsert
>> Any thoughts/insights would be much appreciated!
>> Thanks!
>> Mark

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