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From "Doug Cutting (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (PIG-1748) Add load/store function AvroStorage for avro data
Date Wed, 07 Dec 2011 23:20:40 GMT

    [ https://issues.apache.org/jira/browse/PIG-1748?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13164828#comment-13164828

Doug Cutting commented on PIG-1748:

Russell, this patch looks good to me, except for the print statement.  But you should probably
open a new issue and add it there, as this issue has already been committed, closed and released.
> Add load/store function AvroStorage for avro data
> -------------------------------------------------
>                 Key: PIG-1748
>                 URL: https://issues.apache.org/jira/browse/PIG-1748
>             Project: Pig
>          Issue Type: Improvement
>          Components: impl
>            Reporter: lin guo
>            Assignee: lin guo
>             Fix For: 0.9.0
>         Attachments: AvroStorageUtils-bagfix.patch, PIG-1748-2.patch, PIG-1748-3.patch,
avro_storage.patch, avro_test_files.tar.gz
> We want to use Pig to process arbitrary Avro data and store results as Avro files. AvroStorage()
extends two PigFuncs: LoadFunc and StoreFunc. 
> Due to discrepancies of Avro and Pig data models, AvroStorage has:
> 1. Limited support for "record": we do not support recursively defined record because
the number of fields in such records is data dependent.
> 2. Limited support for "union": we only accept nullable union like ["null", "some-type"].
> For simplicity, we also make the following assumptions:
> If the input directory is a leaf directory, then we assume Avro data files in it have
the same schema;
> If the input directory contains sub-directories, then we assume Avro data files in all
sub-directories have the same schema.
> AvroStorage takes no input parameters when used as a LoadFunc (except for "debug [debug-level]").

> Users can provide parameters to AvroStorage when used as a StoreFunc. If they don't,
Avro schema of output data is derived from its 
> Pig schema.
> Detailed documentation can be found in http://linkedin.jira.com/wiki/display/HTOOLS/AvroStorage+-+Pig+support+for+Avro+data

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