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From "Jaimin D Jetly (JIRA)" <j...@apache.org>
Subject [jira] [Created] (AMBARI-3587) Reassign Master (non-secure): JobTracker reassignment does not need manual step.
Date Thu, 24 Oct 2013 22:14:02 GMT
Jaimin D Jetly created AMBARI-3587:
--------------------------------------

             Summary: Reassign Master (non-secure): JobTracker reassignment does not need
manual step.
                 Key: AMBARI-3587
                 URL: https://issues.apache.org/jira/browse/AMBARI-3587
             Project: Ambari
          Issue Type: Task
          Components: client
    Affects Versions: 1.4.2
            Reporter: Jaimin D Jetly
            Assignee: Jaimin D Jetly
             Fix For: 1.4.2
         Attachments: Reassign master JobTracker.png

On manual step for JobTracker reassignment (non-secure cluster), We ask for copying content
of directories listed in _mapred.local.dir_ property of mapred-site.xml to newly assigned
JobTracker host. Apart from sub-directory _jobTracker_ inside the directory path stated by
_mapred.local.dir_ property , all other sub-directories  are used by TaskTracker and are never
accessed by JobTracker. 

JobTracker creates job configuration xml file and it's CRC file for a running job inside 
<mapred.local.dir value>/jobTracker directory. These are *temporary files* which are
created when job starts and deleted after the job is completed.

I was able to successfully reassign JobTracker without executing manual step in the wizard.
Smoke test for all services passed successfully on the last step of the wizard. 

*As a resolution to this ticket, We need to remove Manual commands step (Reassign master JobTracker.png)
from JobTracker reassignment  wizard in non-secure setup.*

Note: JobTracker Log directories are useful source of information that a user might want to
copy to the target host but it's not a mandatory step and can be a part of ambari docs. 




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