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From "Lars George (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-1287) Partitioner class not used in TableMapReduceUtil.initTableReduceJob()
Date Fri, 24 Apr 2009 12:01:30 GMT

    [ https://issues.apache.org/jira/browse/HBASE-1287?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12702333#action_12702333
] 

Lars George commented on HBASE-1287:
------------------------------------

+1

> 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: Billy Pearson
>             Fix For: 0.19.2, 0.20.0
>
>         Attachments: 1287-2.patch, 1287-3-patch.txt, 1287-4-patch.txt, 1287-5.patch,
1287-6.patch.txt, 1287.patch
>
>
> 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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