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From "Craig Macdonald (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-2862) [HOD] Support PBS env vars in hod configuration
Date Wed, 20 Feb 2008 17:27:43 GMT
[HOD] Support PBS env vars in hod configuration

                 Key: HADOOP-2862
                 URL: https://issues.apache.org/jira/browse/HADOOP-2862
             Project: Hadoop Core
          Issue Type: Improvement
          Components: contrib/hod
    Affects Versions: 0.16.0
         Environment: Torque PBS
            Reporter: Craig Macdonald

In some batch environments, eg using Torque PBS, scratch spaces are provided on cluster nodes
for where jobs should put their temporary files. These are automatically cleaned up when the
job exists by an epilogue script.

For instance, in our local Torque cluster, all nodes have a /scratch partition. For each job,
the prologue script creates a scratch folder owned by the user at /scratch/pbstmp.$PBS_JOBID
- $PBS_JOBID is then the env var containing the job id, as set by pbs_mom.

Would it be possible to use these env vars in the configuration of hod. For instance, say
I want to create an hdfs on demand using hod, but that the hdfs space should be in /scratch/pbstmp.$PBS_JOBID,
not in /tmp/hod say. This would involve HOD supporting env vars in configuration, but knowing
when to substitute the env var with it's current value (ie not until running on the correct
node where the operation should take place).

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