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Daniel Dai commented on PIG-1748: --------------------------------- Patch committed to trunk. Thanks Lin, Jakob! > 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: Jakob Homan > 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://snaprojects.jira.com/wiki/display/HTOOLS/AvroStorage+-+Pig+support+for+Avro+data -- This message is automatically generated by JIRA. - For more information on JIRA, see: http://www.atlassian.com/software/jira