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From "Devaraj Das (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-1252) Disk problems should be handled better by the MR framework
Date Mon, 07 May 2007 12:49:15 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-1252?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Devaraj Das updated HADOOP-1252:

    Attachment: 1252.may7.patch

Attached is a patch that addresses (hopefully) Doug's concerns. 

> Disk problems should be handled better by the MR framework
> ----------------------------------------------------------
>                 Key: HADOOP-1252
>                 URL: https://issues.apache.org/jira/browse/HADOOP-1252
>             Project: Hadoop
>          Issue Type: Bug
>          Components: mapred
>    Affects Versions: 0.12.3
>            Reporter: Devaraj Das
>         Assigned To: Devaraj Das
>             Fix For: 0.13.0
>         Attachments: 1252.may7.patch, 1252.new.patch, 1252.patch, 1252.patch
> The MR framework should recover from Disk Failure problems without causing jobs to hang.
Note that this issue is about a short-term solution to solving the problem. For example, by
looking at the code and improving the exception handling (to better detect faulty disks and
missing files). The long term approach might be to have a FS layer that takes care of failed
disks and makes it transparent to the tasks. That will be a separate issue by itself.
> Some of the issues that have been reported are HADOOP-1087 and a comment by Koji on HADOOP-1200
(not sure whether those are all). Please add to this issue as much details as possible on
disk failures leading to hung jobs (details like relevant exception traces, way to reproduce,

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