server can't set username in JobClient.submitJob for jobs submitted on behalf
of other users
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Key: HADOOP-4875
URL: https://issues.apache.org/jira/browse/HADOOP-4875
Project: Hadoop Core
Issue Type: Bug
Components: mapred
Affects Versions: 0.19.0
Reporter: Michael Bieniosek
I have a rpc server that sits in front of hadoop and submits mapreduce jobs on
behalf of users (humans). However, because hadoop gets username information
from the unix username of the submitting process, all my jobs appear to be from
the unix account used by the webserver.
I tried to fix it by doing this:
JobConf conf = ...
JobClient client = ...
conf.setUser(username);
client.submitJob(conf);
But that doesn't work because submitJob overwrites the username I wrote with
setUser.
Instead, submitJob should only insert a username into the job if it is not in
the config already. Alternately, the username might be inserted at the time of
creation of the JobConf, so that I have an opportunity to overwrite it, or the
JobConf could supply some hook for me to insert some alternate username.
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