[HOD] Create mapred system directory using a naming convention that will avoid
clashes in multi-user shared cluster scenario.
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Key: HADOOP-2925
URL: https://issues.apache.org/jira/browse/HADOOP-2925
Project: Hadoop Core
Issue Type: Bug
Components: contrib/hod
Affects Versions: 0.16.0
Reporter: Hemanth Yamijala
Assignee: Hemanth Yamijala
Fix For: 0.16.1
Currently, HOD generates the name of the mapredsystem directory using the name
/mapredsystem/hostname-of-jobtracker.
In HADOOP-2899, we ran into a scenario where this naming convention could lead
to problems in case dfs permissions are enabled. While the bug should ideally
be addressed in Hadoop M/R, it will be better that HOD does not generate names
that can potentially clash across runs. One way to solve the problem is to do
what HOD already does for local log and temp directories - name it using
username.torque-job-id, which is going to be pretty unique mostly.
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