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From "eric baldeschwieler (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-654) jobs fail with some hardware/system failures on a small number of nodes
Date Mon, 30 Oct 2006 19:24:58 GMT
    [ http://issues.apache.org/jira/browse/HADOOP-654?page=comments#action_12445697 ] 
            
eric baldeschwieler commented on HADOOP-654:
--------------------------------------------

# failures should be visible by node on the job tracker UI.
Nodes that are not getting jobs should be highlighted on the UI.


> jobs fail with some hardware/system failures on a small number of nodes
> -----------------------------------------------------------------------
>
>                 Key: HADOOP-654
>                 URL: http://issues.apache.org/jira/browse/HADOOP-654
>             Project: Hadoop
>          Issue Type: Bug
>          Components: mapred
>    Affects Versions: 0.7.2
>            Reporter: Yoram Arnon
>         Assigned To: Owen O'Malley
>            Priority: Minor
>
> occasionally, such as when the OS is out of some resource, a node fails only partly.
The node is up and running, the task tracker is running and sending heartbeats, but every
task fails because the tasktracker can't fork tasks or something.
> In these cases, that task tracker keeps getting assigned tasks to execute, and they all
fail.
> A couple of nodes like that and jobs start failing badly.
> The job tracker should avoid assigning tasks to tasktrackers that are misbehaving.
> simple approach: avoid tasktrackers that report many more failures than average (say
3X). Simply use the info sent by the TT.
> better but harder: track TT failures over time and:
>  1. avoid those that exhibit a high failure *rate*
>  2. tell them to shut down

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