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From "Lars George (JIRA)" <j...@apache.org>
Subject [jira] Created: (HBASE-1287) Partitioner class not used in TableMapReduceUtil.initTableReduceJob()
Date Wed, 25 Mar 2009 12:12:52 GMT
Partitioner class not used in TableMapReduceUtil.initTableReduceJob()
---------------------------------------------------------------------

                 Key: HBASE-1287
                 URL: https://issues.apache.org/jira/browse/HBASE-1287
             Project: Hadoop HBase
          Issue Type: Bug
          Components: mapred
            Reporter: Lars George
            Assignee: Lars George


Upon checking the available utility methods in TableMapReduceUtil I came across this code:

{code}
  public static void initTableReduceJob(String table,
    Class<? extends TableReduce> reducer, JobConf job, Class partitioner)
  throws IOException {
    job.setOutputFormat(TableOutputFormat.class);
    job.setReducerClass(reducer);
    job.set(TableOutputFormat.OUTPUT_TABLE, table);
    job.setOutputKeyClass(ImmutableBytesWritable.class);
    job.setOutputValueClass(BatchUpdate.class);
    if (partitioner != null) {
      job.setPartitionerClass(HRegionPartitioner.class);
      HTable outputTable = new HTable(new HBaseConfiguration(job), table);
      int regions = outputTable.getRegionsInfo().size();
      if (job.getNumReduceTasks() > regions){
    	job.setNumReduceTasks(outputTable.getRegionsInfo().size());
      }
    }
  }
{code}

It seems though as it should be

{code}
    if (partitioner != null) {
      job.setPartitionerClass(partitioner);
{code}

and the provided HRegionPartitioner can be handed in to that call or a custom one can be provided.

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