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From "Lavkesh Lahngir (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (YARN-3591) Resource Localisation on a bad disk causes subsequent containers failure
Date Fri, 07 Aug 2015 10:21:46 GMT

     [ https://issues.apache.org/jira/browse/YARN-3591?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Lavkesh Lahngir updated YARN-3591:
----------------------------------
    Attachment: YARN-3591.6.patch

Updated the patch with the initial solution.
1. It does not add any overhead. Hardly few microseconds.
2. It does not introduce new problems.
3. it solves the use case.

> Resource Localisation on a bad disk causes subsequent containers failure 
> -------------------------------------------------------------------------
>
>                 Key: YARN-3591
>                 URL: https://issues.apache.org/jira/browse/YARN-3591
>             Project: Hadoop YARN
>          Issue Type: Bug
>    Affects Versions: 2.7.0
>            Reporter: Lavkesh Lahngir
>            Assignee: Lavkesh Lahngir
>         Attachments: 0001-YARN-3591.1.patch, 0001-YARN-3591.patch, YARN-3591.2.patch,
YARN-3591.3.patch, YARN-3591.4.patch, YARN-3591.5.patch, YARN-3591.6.patch
>
>
> It happens when a resource is localised on the disk, after localising that disk has gone
bad. NM keeps paths for localised resources in memory.  At the time of resource request isResourcePresent(rsrc)
will be called which calls file.exists() on the localised path.
> In some cases when disk has gone bad, inodes are stilled cached and file.exists() returns
true. But at the time of reading, file will not open.
> Note: file.exists() actually calls stat64 natively which returns true because it was
able to find inode information from the OS.
> A proposal is to call file.list() on the parent path of the resource, which will call
open() natively. If the disk is good it should return an array of paths with length at-least
1.



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