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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-2489) Jobsplits with random hostnames can make the queue unusable
Date Wed, 15 Jun 2011 16:55:48 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-2489?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13049876#comment-13049876
] 

Hadoop QA commented on MAPREDUCE-2489:
--------------------------------------

-1 overall.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12482679/MAPREDUCE-2489-0.20s.patch
  against trunk revision 1136000.

    +1 @author.  The patch does not contain any @author tags.

    +1 tests included.  The patch appears to include 6 new or modified tests.

    -1 patch.  The patch command could not apply the patch.

Console output: https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/397//console

This message is automatically generated.

> 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.patch, MAPREDUCE-2489-mapred-v2.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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