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From "Phu Hoang (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-2574) bugs in mapred tutorial
Date Tue, 15 Jan 2008 01:09:34 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-2574?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12558893#action_12558893
] 

Phu Hoang commented on HADOOP-2574:
-----------------------------------

Arun,

the tutorial addresses all the bugs that I encountered.  Great job!!

I was not able to detect that you resolved the smaller confusion (not  
show stopper) of whether these examples work if you were in stand- 
alone mode or not.

I was able to run WordCount v1.0 using local input and output  
directories (not HDFS).  I was NOT able to run WordCount v2.0 using  
local input and output directories, only HDFS input and output  
directories work there.  It would be good to set the reader's  
expectation.

I could see people trying the examples out without doing HDFS first,  
and may run into issues with WordCount v2.0.

Phu





> bugs in mapred tutorial
> -----------------------
>
>                 Key: HADOOP-2574
>                 URL: https://issues.apache.org/jira/browse/HADOOP-2574
>             Project: Hadoop
>          Issue Type: Bug
>          Components: documentation
>            Reporter: Doug Cutting
>            Assignee: Arun C Murthy
>             Fix For: 0.15.3
>
>         Attachments: HADOOP-2574_0_20080110.patch, HADOOP-2574_1_20080114.patch, mapred_tutorial.html,
mapred_tutorial.html
>
>
> Sam Pullara sends me:
> {noformat}
> Phu was going through the WordCount example... lines 52 and 53 should have args[0] and
args[1]:
> http://lucene.apache.org/hadoop/docs/current/mapred_tutorial.html
> The javac and jar command are also wrong, they don't include the directories for the
packages, should be:
> $ javac -classpath ${HADOOP_HOME}/hadoop-${HADOOP_VERSION}-core.jar -d classes WordCount.java

> $ jar -cvf /usr/joe/wordcount.jar WordCount.class -C classes .
> {noformat}

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