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https://issues.apache.org/jira/browse/HADOOP-693?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12646575#action_12646575
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Steve Loughran commented on HADOOP-693:
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{{JobClient}} implements {{Tool}} and hence {{Configurable}}, so {{setConf()}}
is a way to do late-binding configuration. To remove the empty constructor,
you'd also need to pull this method, the few tests that use it, and run a risk
of backwards compatibility. It may be better to have a {{verifyConfigured()}}
method on various methods that throws an exception if the class is used before
being configured.
> JobClient can be constructed without initializing object state
> --------------------------------------------------------------
>
> Key: HADOOP-693
> URL: https://issues.apache.org/jira/browse/HADOOP-693
> Project: Hadoop Core
> Issue Type: Bug
> Components: mapred
> Affects Versions: 0.8.0
> Reporter: Nigel Daley
> Assignee: Owen O'Malley
>
> The JobClient class has a no-arg constructor that does nothing. This leaves
> critical object state uninitialized.
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