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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