[jira] Updated: (HADOOP-2925) [HOD] Create mapred system directory using a naming convention that will avoid clashes in multi-user shared cluster scenario.

["Hemanth Yamijala (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HADOOP-2925?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Hemanth Yamijala updated HADOOP-2925:
-------------------------------------

    Attachment: 2925.patch

Attached patch will name mapred system directories using <username>.<torque-jobid> format. This will prevent a clash from occuring in a multi-user shared cluster scenario. The patch also includes some changes that will help HADOOP-2899 in case the JobTracker implements mechanisms to clean up the mapred system directory at shutdown time.

> [HOD] Create mapred system directory using a naming convention that will avoid clashes in multi-user shared cluster scenario.
> -----------------------------------------------------------------------------------------------------------------------------
>
>                 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
>
>         Attachments: 2925.patch
>
>
> 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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