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From "Arun C Murthy (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-654) jobs fail with some hardware/system failures on a small number of nodes
Date Wed, 07 Feb 2007 07:11:05 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-654?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12470829
] 

Arun C Murthy commented on HADOOP-654:
--------------------------------------

Looks like Owen's nailed it for a decent first-cut which can be enhanced at a later point
for features like global error-rate, asking TT to shut-down etc. 
I'll get on with the first-cut...

> jobs fail with some hardware/system failures on a small number of nodes
> -----------------------------------------------------------------------
>
>                 Key: HADOOP-654
>                 URL: https://issues.apache.org/jira/browse/HADOOP-654
>             Project: Hadoop
>          Issue Type: Bug
>          Components: mapred
>    Affects Versions: 0.7.2
>            Reporter: Yoram Arnon
>         Assigned To: Arun C Murthy
>            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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