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From "Alan Gates (JIRA)" <j...@apache.org>
Subject [jira] Commented: (PIG-1117) Pig reading hive columnar rc tables
Date Tue, 05 Jan 2010 18:47:55 GMT

    [ https://issues.apache.org/jira/browse/PIG-1117?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12796797#action_12796797
] 

Alan Gates commented on PIG-1117:
---------------------------------

Gerrit, is this ready to be reviewed again or should I wait until you implement fieldsToRead?

Also, I wanted to give you a heads up on the changes in the load/store branch (see PIG-966).
 This will affect your code.  It's still fine to work on this and check it into trunk so you
and others can use it now.  But when we merge that branch into trunk (currently anticipated
sometime in February or March) it will require changing your slicer to an InputFormat and
making changes in your LoadFunc.  Assuming Hive has an InputFormat for RCFile you may be able
to use that directly.

> Pig reading hive columnar rc tables
> -----------------------------------
>
>                 Key: PIG-1117
>                 URL: https://issues.apache.org/jira/browse/PIG-1117
>             Project: Pig
>          Issue Type: New Feature
>    Affects Versions: 0.7.0
>            Reporter: Gerrit Jansen van Vuuren
>            Assignee: Gerrit Jansen van Vuuren
>             Fix For: 0.7.0
>
>         Attachments: HiveColumnarLoader.patch, HiveColumnarLoaderTest.patch, PIG-1117.patch,
PIG-117-v.0.6.0.patch, PIG-117-v.0.7.0.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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