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From Avery Ching <>
Subject Re: Using HCatInputFormat / HCatOutputFormat to access Hive tables
Date Fri, 18 Nov 2011 21:36:17 GMT
Thank you for the quick response.  I'm using composition to implement 
Giraph's VertexInputFormat/VertexOutputFormat, so it's fine that 
mapreduce is used.  Has HCatInputFormat/HCatOutputFormat been tested 
successfully with Hive's latest releases?  I'd love to see someone's 
example code if it exists to load data from HCatInputFormat...


On 11/18/11 12:49 PM, David Capwell wrote:
> Currently hcat only supports the mapreduce package and not the mapred package that giraph
> Also in order to use hcat your table properties must define "hcat.isd" and "hcat.osd"
which stand for InputStorageDriver and OutputStorageDriver.  These are the interfaces used
in hcat to read/write data.
> On Nov 18, 2011, at 12:36:04PM, Avery Ching wrote:
>> Hi,
>> I was interested in trying out HCatalog to access Hive tables for Apache
>> Giraph (basically a map-only job).  I tried out some code from
>> HCatMapReduceTest, but had some issues getting it to work.  Is there
>> some documentation on how to use HCatInputFormat properly with Hive tables?
>> Thanks,
>> Avery

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