JobClient.submitJob(...) should not use "Dr Who" as a default username
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Key: HADOOP-2833
URL: https://issues.apache.org/jira/browse/HADOOP-2833
Project: Hadoop Core
Issue Type: Bug
Components: mapred
Reporter: Tsz Wo (Nicholas), SZE
In JobClient line 530, we have
{code}
String user = System.getProperty("user.name");
job.setUser(user != null ? user : "Dr Who");
{code}
Since a ugi is already obtained in the earlier codes, we should get the
username from ugi, not System.getProperty("user.name"). Also, Exception should
be thrown if the username is null, instead of using a default.
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