hadoop-mapreduce-issues mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Jeffrey Naisbitt (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (MAPREDUCE-2489) Jobsplits with random hostnames can make the queue unusable
Date Fri, 20 May 2011 14:26:47 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-2489?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jeffrey Naisbitt updated MAPREDUCE-2489:
----------------------------------------

    Attachment: MAPREDUCE-2489-mapred.patch

> Jobsplits with random hostnames can make the queue unusable
> -----------------------------------------------------------
>
>                 Key: MAPREDUCE-2489
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-2489
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: jobtracker
>            Reporter: Jeffrey Naisbitt
>            Assignee: Jeffrey Naisbitt
>         Attachments: MAPREDUCE-2489-mapred.patch
>
>
> We saw an issue where a custom InputSplit was returning invalid hostnames for the splits
that were then causing the JobTracker to attempt to excessively resolve host names.  This
caused a major slowdown for the JobTracker.  We should prevent invalid InputSplit hostnames
from affecting everyone else.
> I propose we implement some verification for the hostnames to try to ensure that we only
do DNS lookups on valid hostnames (and fail otherwise).  We could also fail the job after
a certain number of failures in the resolve.

--
This message is automatically generated by JIRA.
For more information on JIRA, see: http://www.atlassian.com/software/jira

Mime
View raw message