[jira] [Commented] (FLINK-1271) Extend HadoopOutputFormat and HadoopInputFormat to handle Void.class

["Stephan Ewen (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FLINK-1271?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14222151#comment-14222151 ] 

Stephan Ewen commented on FLINK-1271:
-------------------------------------

I think we could drop the limitation to {Writable} in the Hadoop formats. The Writable limitation does not really come from the input format, but only from the data movement of Hadoop. Since we operate differently anyways, I see no fundamental reason to restrict the Hadoop Input Format types to Writables.

> Extend HadoopOutputFormat and HadoopInputFormat to handle Void.class 
> ---------------------------------------------------------------------
>
>                 Key: FLINK-1271
>                 URL: https://issues.apache.org/jira/browse/FLINK-1271
>             Project: Flink
>          Issue Type: Wish
>          Components: Hadoop Compatibility
>            Reporter: Felix Neutatz
>            Priority: Minor
>              Labels: Columnstore, HadoopInputFormat, HadoopOutputFormat, Parquet
>
> Parquet, one of the most famous and efficient column store formats in Hadoop uses Void.class as Key!
> At the moment there are only keys allowed which extend Writable.
> For example, we would need to be able to do something like:
> HadoopInputFormat hadoopInputFormat = new HadoopInputFormat(new ParquetThriftInputFormat(), Void.class, AminoAcid.class, job);
> ParquetThriftInputFormat.addInputPath(job, new Path("newpath"));
> ParquetThriftInputFormat.setReadSupportClass(job, AminoAcid.class);
> // Create a Flink job with it
> DataSet<Tuple2<Void, AminoAcid>> data = env.createInput(hadoopInputFormat);
> Where AminoAcid is a generated Thrift class in this case.
> However, I figured out how to output Parquet files with Parquet by creating a class which extends HadoopOutputFormat.
> Now we will have to discuss, what's the best approach to make the Parquet integration happen



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