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From "Jeffrey Naisbitt (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-2489) Jobsplits with random hostnames can make the queue unusable
Date Thu, 23 Jun 2011 17:49:47 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-2489?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13054002#comment-13054002
] 

Jeffrey Naisbitt commented on MAPREDUCE-2489:
---------------------------------------------

Again, this patch will fail until HADOOP-7314 has been committed.

> 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
>    Affects Versions: 0.20.205.0, 0.23.0
>            Reporter: Jeffrey Naisbitt
>            Assignee: Jeffrey Naisbitt
>         Attachments: MAPREDUCE-2489-0.20s-v2.patch, MAPREDUCE-2489-0.20s.patch, MAPREDUCE-2489-mapred-v2.patch,
MAPREDUCE-2489-mapred-v3.patch, 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.

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