Job class should create the rpc client only when needed
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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
Fix For: 0.22.0
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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