[jira] [Assigned] (MAPREDUCE-4574) Fix TotalOrderParitioner to work with non-WritableComparable key types

["Harsh J (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/MAPREDUCE-4574?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Harsh J reassigned MAPREDUCE-4574:
----------------------------------

    Assignee: Harsh J
    
> Fix TotalOrderParitioner to work with non-WritableComparable key types
> ----------------------------------------------------------------------
>
>                 Key: MAPREDUCE-4574
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-4574
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: client
>    Affects Versions: 2.0.0-alpha
>            Reporter: Harsh J
>            Assignee: Harsh J
>
> The current TotalOrderPartitioner class will not work with an alternative serialization library such as Avro.
> To make it work, we may edit the readPartitions bits in it to support non-WritableComparable keys and also remove the WritableComparable check in the class types definition.
> That is, since we do not use the values at all (NullWritable), we may as well do:
> {code}
>   private K[] readPartitions(FileSystem fs, Path p, Class<K> keyClass,
>       Configuration conf) throws IOException {
>     …
>     while ((key = (K) reader.next(key)) != null) {
>       parts.add(key);
>       key = ReflectionUtils.newInstance(keyClass, conf);
>     }
>     …
>   }
> {code}

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