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https://issues.apache.org/jira/browse/PIG-2195?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13084462#comment-13084462
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Bill Graham commented on PIG-2195:
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Thanks Alan. Regarding the naming of the new {{schema_file}} field, with the
recent commit of AVRO-872, Avro will supports parsing multiple schema files in
1.6.0. I'd like to contribute a patch to {{AvroStorage}} to support that at
some point.
With that in mind, should {{schema_file}} instead be {{schema_files}} so it can
at some point accept a comma-separated list perhaps? Or we could allow multiple
files to be passed to {{schema_file}} at some point. Or we can later introduce
{{schema_files}} with an {{s}}. Many options, but something to plan for now.
> AvroStorage fails to STORE when LOADing via PigStorage
> ------------------------------------------------------
>
> Key: PIG-2195
> URL: https://issues.apache.org/jira/browse/PIG-2195
> Project: Pig
> Issue Type: Bug
> Reporter: Bill Graham
> Assignee: Bill Graham
> Attachments: PIG-2195_1.patch,
> expected_testRecordSplitFromText1.avro, expected_testRecordSplitFromText2.avro
>
>
> Reading data via {{PigStorage}} and writing it via {{AvroStorage}} fails with
> an exception like this
> {{java.lang.ClassCastException: org.apache.pig.data.BinSedesTuple cannot be
> cast to org.apache.avro.generic.IndexedRecord}}
> The Pig script in this section of the documentation shows an example like
> this that fails:
> http://linkedin.jira.com/wiki/display/HTOOLS/AvroStorage+-+Pig+support+for+Avro+data#AvroStorage-PigsupportforAvrodata-A.Howtostoredataindifferentways.
> A workaround currently exists to produce avro from TSVs like this:
> {noformat}
> avro = LOAD 'inputPath/' AS (foo);
> STORE avro INTO 'outputPath/' USING oap.piggybank.storage.avro.AvroStorage(
> '{"data":"data_file.avro",
> "same":"data_file.avro", "field0":"def:bar"}');
> {noformat}
> This is redundant though and {{data}} and {{same}} seem to indicate the same
> thing. This approach also requires an existing avro data file to exist. This
> patch will make the following alternate constructor syntax's work as well.
> # Read schema from an existing data file:
> {noformat}
> '{"data":"data_file.avro", "field0":"def:bar"}');
> {noformat}
> # Read schema from an existing schema file:
> {noformat}
> '{"schema_file":"data_file.avsc", "field0":"def:bar"}');
> {noformat}
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