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From "Devaraj Das (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-895) Reduce hang on small set of SequenceFiles (reproducible)
Date Thu, 17 May 2007 10:26:16 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-895?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12496523
] 

Devaraj Das commented on HADOOP-895:
------------------------------------

Did you get a chance to test your app with the newer releases? Does this problem still exist?

> Reduce hang on small set of SequenceFiles (reproducible)
> --------------------------------------------------------
>
>                 Key: HADOOP-895
>                 URL: https://issues.apache.org/jira/browse/HADOOP-895
>             Project: Hadoop
>          Issue Type: Bug
>          Components: mapred
>    Affects Versions: 0.10.1
>         Environment: This happens both on a mac and on a Linux x86_64 machine.
>            Reporter: Doug Judd
>            Priority: Blocker
>         Attachments: hangmod-patchfile
>
>
> I'm running into a problem where a Map/Reduce job hangs in the reduce phase.  It happens
on a simple program to dump the keys of a small set of SequenceFiles.  It can be reproduced
as follows:
> 1. Pull a vanilla hadoop-0.10.1 release and untar it
> 2. Apply the attached patch
> 3. Modify conf/hadoop-env.sh to have the correct JAVA_HOME
> 4. Run the following script:
> #!/bin/sh
> ant zvents
> ./bin/hadoop namenode -format
> mkdir fs-hadoop/dfs/tmp
> mkdir fs-hadoop/dfs/data
> mkdir -p fs-hadoop/mapred/local
> ./bin/start-all.sh
> sleep 5
> ./bin/hadoop dfs -mkdir /heritrix
> ./bin/hadoop dfs -mkdir /heritrix/crawls
> ./bin/hadoop dfs -mkdir /heritrix/crawls/test-4-20070116061502956
> ./bin/hadoop dfs -copyFromLocal data/IAH-20070116061532-00000-doug-judds-computer.local
/heritrix/crawls/test-4-20070116061502956
> ./bin/hadoop dfs -copyFromLocal data/IAH-20070116061539-00001-doug-judds-computer.local
/heritrix/crawls/test-4-20070116061502956
> ./bin/hadoop dfs -copyFromLocal data/IAH-20070116061539-00002-doug-judds-computer.local
/heritrix/crawls/test-4-20070116061502956
> ./bin/hadoop com.zvents.hadoop.DumpUrls /heritrix/crawls/test-4-20070116061502956 /foo
> - Doug

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