[jira] Updated: (HADOOP-3258) FileOutputFormat should have a method to create custom files under the outputdir with a unique name per task to avoid name collision

["Mukund Madhugiri (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HADOOP-3258?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Mukund Madhugiri updated HADOOP-3258:
-------------------------------------

    Fix Version/s:     (was: 0.18.0)

> FileOutputFormat should have a method to create custom files under the outputdir with a unique name per task to avoid name collision
> ------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: HADOOP-3258
>                 URL: https://issues.apache.org/jira/browse/HADOOP-3258
>             Project: Hadoop Core
>          Issue Type: New Feature
>          Components: mapred
>         Environment: all
>            Reporter: Alejandro Abdelnur
>            Assignee: Alejandro Abdelnur
>         Attachments: patch-3258.txt, patch-3258.txt
>
>
> Currently, if a M/R code creates a file, it is the responsibility of the M/R code to avoid file name collisions from different tasks.
> Hadoop should provide an API that creates unique file names based on the task type (map or reduce) and the task ID. Similarly to how output files, part-#####, are created.
> The proposed patch adds 2 static methods to the {{FileOutputFormat}}
> {nofomat}
>   public static String getUniqueName(JobConf conf, String name);
>   public static Path getPathForCustomFile(JobConf conf, String name);
> {nofomat}
> The first one adds task type and task ID to the given name.
> The second gives a PATH to a file in the working outputdir using a file name namespaced by the first method.

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