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https://issues.apache.org/jira/browse/PIG-1748?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jakob Homan updated PIG-1748:
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Assignee: lin guo (was: Jakob Homan)
> 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: 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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