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From "Gerrit van Vuuren" <gvanvuu...@specificmedia.com>
Subject RE: [jira] Updated: (PIG-1117) Pig reading hive columnar rc tables
Date Mon, 07 Dec 2009 16:12:42 GMT
Hi,

I would like to extend the HiveColumnarRC Reader in such a way that it can tell Pig to only
use a certain group of files, i.e. I want to filter the files and have Pig only use these
for calculating the amount of tasks to run. I'll appreciate if anybody can point me in the
right direction.

Cheers,
 Gerrit

-----Original Message-----
From: Gerrit Jansen van Vuuren (JIRA) [mailto:jira@apache.org] 
Sent: 03 December 2009 16:03
To: pig-dev@hadoop.apache.org
Subject: [jira] Updated: (PIG-1117) Pig reading hive columnar rc tables


     [ https://issues.apache.org/jira/browse/PIG-1117?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Gerrit Jansen van Vuuren updated PIG-1117:
------------------------------------------

    Attachment: HiveColumnarLoaderTest.patch
                HiveColumnarLoader.patch

Pig Storage Loader for reading from HiveColumnarRC Files

> Pig reading hive columnar rc tables
> -----------------------------------
>
>                 Key: PIG-1117
>                 URL: https://issues.apache.org/jira/browse/PIG-1117
>             Project: Pig
>          Issue Type: New Feature
>            Reporter: Gerrit Jansen van Vuuren
>         Attachments: HiveColumnarLoader.patch, HiveColumnarLoaderTest.patch
>
>
> I've coded a LoadFunc implementation that can read from Hive Columnar RC tables, this
is needed for a project that I'm working on because all our data is stored using the Hive
thrift serialized Columnar RC format. I have looked at the piggy bank but did not find any
implementation that could do this. We've been running it on our cluster for the last week
and have worked out most bugs.
>  
> There are still some improvements to be done but I would need  like setting the amount
of mappers based on date partitioning. Its been optimized so as to read only specific columns
and can churn through a data set almost 8 times faster with this improvement because not all
column data is read.
> I would like to contribute the class to the piggybank can you guide me in what I need
to do?
> I've used hive specific classes to implement this, is it possible to add this to the
piggy bank build ivy for automatic download of the dependencies?

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