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

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

Harsh J created MAPREDUCE-4574:
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             Summary: 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


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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