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From "Dick King (JIRA)" <j...@apache.org>
Subject [jira] Updated: (MAPREDUCE-1505) Cluster class should create the rpc client only when needed
Date Wed, 19 May 2010 18:14:55 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-1505?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Dick King updated MAPREDUCE-1505:
---------------------------------

    Attachment: mapreduce-1505--2010-05-19.patch

Delays making a connection to the job tracker node until it's needed.

Provides a new API so a user can tell whether this has been done, for a given job [although
usually there would be no need to know].


> 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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