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From "Erik Forsberg (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-3437) mapred.job.tracker default value/docs appear out of sync with code
Date Mon, 15 Jun 2009 19:46:07 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-3437?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12719736#action_12719736
] 

Erik Forsberg commented on HADOOP-3437:
---------------------------------------

After some fiddling I found that the solution I proposed in the previous comment does work
halfway - you can submit jobs, but the reduce processes fails to connect to hdfs to fetch
files. 

I found a better workaround:

1) Leave the configuration as detailed at http://hadoop.apache.org/core/docs/current/quickstart.html#PseudoDistributed

2) Disable IPv6 in Java by editing conf/hadoop-env.sh, as follows:

HADOOP_OPTS=-Djava.net.preferIPv4Stack=true

> mapred.job.tracker default value/docs appear out of sync with code
> ------------------------------------------------------------------
>
>                 Key: HADOOP-3437
>                 URL: https://issues.apache.org/jira/browse/HADOOP-3437
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: conf
>    Affects Versions: 0.18.0
>            Reporter: Steve Loughran
>            Priority: Minor
>
> This is the settings for mapred.job.tracker in SVN_HEAD. If you dont override these,
you get a RuntimeException
> <property>
>   <name>mapred.job.tracker</name>
>   <value>local</value>
>   <description>The host and port that the MapReduce job tracker runs
>   at.  If "local", then jobs are run in-process as a single map
>   and reduce task.
>   </description>
> </property>

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