hadoop-mapreduce-issues mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Ravi Teja Ch N V (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-2632) Avoid calling the partitioner when the numReduceTasks is 1.
Date Thu, 30 Jun 2011 05:44:28 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-2632?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13057630#comment-13057630
] 

Ravi Teja Ch N V commented on MAPREDUCE-2632:
---------------------------------------------

The fix was missed in this case.

{code:title=MapFileOutputFormat.java|borderStyle=solid}
 public static <K extends WritableComparable<?>, V extends Writable>
      Writable getEntry(MapFile.Reader[] readers, 
      Partitioner<K, V> partitioner, K key, V value) throws IOException {
    int part = partitioner.getPartition(key, value, readers.length);
    return readers[part].get(key, value);
  }
{code}

> Avoid calling the partitioner when the numReduceTasks is 1.
> -----------------------------------------------------------
>
>                 Key: MAPREDUCE-2632
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-2632
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>          Components: tasktracker
>    Affects Versions: 0.23.0
>            Reporter: Ravi Teja Ch N V
>
> We can avoid the call to the partitioner when the number of reducers is 1.This will avoid
the unnecessary computations by the partitioner.

--
This message is automatically generated by JIRA.
For more information on JIRA, see: http://www.atlassian.com/software/jira

        

Mime
View raw message