[jira] Commented: (PIG-1748) Add load/store function AvroStorage for avro data

["Doug Cutting (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/PIG-1748?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12969880#action_12969880 ] 

Doug Cutting commented on PIG-1748:
-----------------------------------

I skimmed this, and overall it looks great!  The only thing I noticed is that it should probably depend on avro-1.4.1 rather than 1.4.0.


> 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
>         Attachments: avro_storage.patch
>
>
> 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://snaprojects.jira.com/wiki/display/HTOOLS/AvroStorage+-+Pig+support+for+Avro+data

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