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From "Amareshwari Sriramadasu (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MAPREDUCE-1505) Cluster class should create the rpc client only when needed
Date Tue, 25 May 2010 05:32:25 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-1505?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12871000#action_12871000
] 

Amareshwari Sriramadasu commented on MAPREDUCE-1505:
----------------------------------------------------

bq. public static getInstance(Configuration conf)
This should  be 
{code}
public static Job getInstance(Configuration conf);
{code}

> Cluster class should create the rpc client only when needed
> -----------------------------------------------------------
>
>                 Key: MAPREDUCE-1505
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-1505
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: client
>    Affects Versions: 0.20.2
>            Reporter: Devaraj Das
>            Assignee: Dick King
>             Fix For: 0.22.0
>
>         Attachments: mapreduce-1505--2010-05-19.patch, MAPREDUCE-1505_yhadoop20.patch,
MAPREDUCE-1505_yhadoop20_9.patch
>
>
> It will be good to have the org.apache.hadoop.mapreduce.Cluster create the rpc client
object only when needed (when a call to the jobtracker is actually required). org.apache.hadoop.mapreduce.Job
constructs the Cluster object internally and in many cases the application that created the
Job object really wants to look at the configuration only. It'd help to not have these connections
to the jobtracker especially when Job is used in the tasks (for e.g., Pig calls mapreduce.FileInputFormat.setInputPath
in the tasks and that requires a Job object to be passed).
> In Hadoop 20, the Job object internally creates the JobClient object, and the same argument
applies there too.

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